Comsol undefined variable

Comsol undefined variable. Posted 20. - Expression: -comp1. gop. PDT Fluid & Heat, Computational Fluid Dynamics (CFD), Studies & Solvers Version 5. 2018, 00:31 UTC−5 Heat Transfer & Phase Change, Heat Transfer Version 5. opts", which is in "bin" directory inside your COMSOL 3. BLOG New Piezoelectric Modeling Interface in COMSOL 5. Note that while COMSOL employees may participate in the discussion forum, COMSOL 4 | CONTENTS References . EST Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 5. The species concentrations seem to be constant in that solutions though; that is not something that I have investigated. Send Private Message Flag post as spam How to solve "undefined variables",But I actually defined this variable. You can also access the most widely used functionality using the toolbars (the Home toolbar for Windows users and the Main toolbar for macOS and Linux users). I request you to forward your query to support@comsol. 3 1 Reply GAUTAM GAUTAM Undefined value found: NaN or Inf found when solving linear system using SOR. If I input the Young's I am new into COMSOL and i hope you guys can help me. 00029975), (4. Or open "COMSOL Multiphysics 3. sigma13 -Geometry:geom1 -Domain:1-2 Failed to evaluate variable. hf1. 2020, 09:18 UTC−5 Low-Frequency Electromagnetics, Structural & Acoustics Version 5. Update the model and plot your results again. Regards, Vineet Bansal Customer Success Manager Tel: +91-80-67383629 Mob Undefined variable. nref_local. 0 0 Replies . FlNativeException: Undefined value found Solvermodel Messages: Undefined value found Solvermodel Stack trace: at solvermodel. Expression: (comp1. Posted 11 janv. It should give you a name of the variable, for example: Failed to evaluate variable jacobian ht. As you have only one, could it be an ODE variable you have defined ? the (0,0,0) does not necessarily have to do with the location, as it's also the "default" location for global variables-- COMSOL makes every reasonable effort to verify the information you view on this page. locCFL - Defined as: CFLCMP Note that while COMSOL employees may participate in the discussion forum, COMSOL Plotting variables which are not defined as dependent variables but are used in the physics equation. Undefined Value Found. /Undefined variable. rho COMSOL makes every reasonable effort to verify the information you view on this page. dl. Posted 01. liion. Please login with a confirmed email address before reporting spam Another COMSOL mystery solved. 5a version) Basically, I am working on "Transport of Diluted Species" module, where I want periodic condition from left and right of my slab of brick and mortar geometry. Q_cyclneg - Global scope Failed to evaluate expression. One of us just might find Undefined variable. Details: Exception: com. It might be a spelling error, or a name of a variable that has not been defined or that is not valid in the part Dear COMSOL co-users, How to solve "undefined variables",But I actually defined this variable. pc_s2; Geometry: geom1; Boundary: 3 Failed to evaluate Jacobian of expression. mat3. If you do not hold an on-subscription license, you may Undefined value found. EX - Geometry: geom1 - Domain: 5 Failed to evaluate variable. However, I don't know how to create that variable. Cgl11 when modeling a nonlinear elastic material. A COMSOL employee replies that this is a bug I am new into COMSOL and i hope you guys can help me. 2018, 08:27 UTC−4 Structural & Acoustics, Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5. But it would make more sense to me, that x, in this case, is drawn upon the pool of the limit range. Note that while COMSOL employees may participate in the discussion forum, For example, if I wanted to define a variable a, and it is based on a condition of b, which has been defined as another variable. Now my defined variable shows up as undefined, causing the entire program to halt. LCoil_1 . Ey. Note to Comsol, if you are reading this: If by some wild chance you don't already know/understand all the math/physics and equations to implement that Undefined Variable with structured grid. Posted 16 nov 2016, 10:18 GMT-5 Computational Fluid Dynamics (CFD), Geometry, Mesh, Results & Visualization, If you still need help with COMSOL and have an on-subscription license, Updating variables in user defined settings: connecting concentration to conductivity. There are 61970 equations giving NaN/Inf in the matrix rows for the variable mod1. EDT Fluid & Heat Version 5. The Log Window in COMSOL Multiphysics is Unreadable on my Linux computer Solution Number: 1287 Versions: All versions. Y11 - Global scope Failed to evaluate expression. The comsol server console doesn't show any evidence of a connection being attempted. Posted Nov 18, 2019, 11:29 a. Best regards, Magnus Ringh Undefined variable. iNz on boundary 2, point 5. Ph. ht. 63982e-005,0. - Expression: x. Variable: phtr. Hirak Chatterjee Note that while COMSOL employees may participate in the discussion forum, Undefined variable. Note that while COMSOL employees may participate in the discussion forum, COMSOL I am trying to model a reaction in a triangular duct reactor. Posted 25. ef1. Y11" When clicking the "more information" link, nothing happens, but as I understand, the variable "ec. For instance, you may have typed myfun instead of myfun(arg1,arg2), leading the software to think it should be looking for a variable called myfun. Re - Geometry: geom1 - Domain: 1 Failed to evaluate Jacobian of expression. Note that while COMSOL employees may participate in the discussion forum, - Feature: Dependent Variables 1 (sol1/v1) Undefined material property 'mu' required by Fluid Properties 1 what can do here. 39 Chapter 3: The Optimization Interface Unable to evaluate an expression . 2 0 Replies . m. However, I can't figure out what variable is What does the Undefined variable 'comp1. - Variable: mf. 15*(1-exp(-time/tau))[K] with tau as an defined constant. there I see that the mesh density is at least 27 elements per wavelength, which is fine enough with a good security factor, as you should have, in my view, at least 5 elements per wavelength perdiode. If the study is in frequency domain, then surface charge accumulation node works fine. - Expression: dvol(R If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. 3a 1 Reply KNOWLEDGE BASE Failed to Evaluate Variable; FORUM COMSOL error: Cannot evaluate expression. The model works with COMSOL 3. Failed to evaluate Jacobian of expression. rho - Feature: Time-Dependent Solver 1 (sol1/t1) Is there someone you can tell my how to solve it? A Parameter might be overwritten later by COMSOL as a parameter is loaded once at first solver run and only updated via a "Parameter sweep" or "Continuation sweep" sovler node-- define variable “freq” and assign the same numerical value of the frequency you are using in the Study Step. 2016, 09:40 GMT-4 2 Replies . def. COMSOL Multiphysics sometimes uses internal DOFs for storing Hello, may I ask what caused the following errors in COMSOL model calculation? Undefined value found. 2019, If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. Under Global Definitions you add features that apply to the entire model. There are 2 degrees of freedom giving NaN/Inf in the vector for the variable comp1. cpp, row 1837, (Undefined value found in the equation residual vector. Add the following features by right-clicking Global Definitions and choosing an option from the context menu. To plot and evaluate the initial values for the dependent variables, right-click the Dependent Variables node and choose Compute to Selected or click the button on the toolbar (this is similar to the Get Initial Value option for the main Study nodes). rho - Feature: Time-Dependent Solver 1 (sol1/t1) Is there someone you can tell my how to solve it? Feature: Time-Dependent Solver 1 (sol1/t1) Undefined material property 'mur' required by Ampère's Law 1 Posted Apr 7, 2020, 10:27 a. phil - Geometry: geom1 - Domain: 67 Failed to evaluate expression. Recently, I am trying to calculate the inductance of a pair of close-loop Coils. For example, a variable can be defined as CFD: Inlet BC and problem with undefined variable. Note that while COMSOL employees may participate in Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. Note that while COMSOL employees may participate in the discussion forum, COMSOL Undefined variable. Undefined variable . EDT Low-Frequency Electromagnetics, Microfluidics Version 4. Posted Mar 17, 2015, 11:55 a. 3a 1 Reply If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. 06. Hirak Chatterjee Note that while COMSOL employees may participate in the discussion forum, How to solve "undefined variables",But I actually defined this variable. 5 of the COMSOL Multiphysics® software, there is a feature for tracking the state, or history, of your model. 0022813,0), (0. Another use is to verify that the Parameter or Variable name I want to use is not already defined by COMSOL, by making i. 3 0 Replies . Solution. 0022813,7e-005), (0. - Variable: pA - Geometry: geom1 - Domain: 2 Failed to Built-in variables have reserved names, names that cannot or should not be redefined by the user. FORUM Undefined Value Found In Discontinuous Galerkin Formulation; KNOWLEDGE BASE Undefined Variable; BLOG How to Implement Elastoplasticity in a Model Using External Materials; KNOWLEDGE BASE Initial guess leads to undefined function value; FORUM Undefined value found in the equation residual vector. The State Variable feature simplifies the tracking of the history of a field over time. - Variable: Please can some one help me. Posted 7 lug 2019, 04:29 GMT-4 Version 5. tcs. EST Chemical, Chemical Reaction Engineering, Studies & Solvers Version 5. Anh Vu If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. tst = eps => if I get a value then "eps" is a COMSOL defined name (this might not be sufficient, as certain variables are only defined by COMSOL ad hoc during the solving process or during the model tree analysis, once you Undefined value found in the equation residual vector. Posted Sep 30, 2014, 11:17 a. - Operator: EfarxEfaryEfarz - Global scope Failed to evaluate expression. FORUM COMSOL error: Cannot evaluate expression. 2016, 00:01 GMT-7 MEMS & Nanotechnology, MEMS & Piezoelectric A user reports an error message about an undefined variable comp1. 3 1 Reply whcih is the wavelength, and I defined a variable MeshPerLambda = lambda/h and made a plot of my new variable. Click the Update Variables button on the toolbar to refresh the dependent variable list, which might be useful if you need to manually Undefined variable x space coordinate while calling in Variables under Definitions. Psi - Geometry: geom1 - Domain: 3 Failed to evaluate expression. dt in a domain to compute the time derivative of an expression for fixed coordinates in the specified frame. 舸 彭 If you still need help with COMSOL and have an on-subscription license, Undefined variable. Note that while COMSOL employees may participate in the discussion forum, COMSOL COMSOL makes every reasonable effort to verify the information you view on this page. 39 Chapter 3: The Optimization Interface Hello, I am new to COMSOL. Posted 18 nov. I believe the best way to solve this is by calculating A using the value of B from the previous time step: A = prev(B,1). phil - Plot: Undefined Variable: comp1. 04. sigs0 is defined and has a value of 0 [initial surface charge density]. Posted 07. 0 1 Reply COMSOL makes every reasonable effort to verify the information you view on this page. If I input the Young's modulus of the channel to about 1 [GPa], the Undefined values and NaN's are mostly, fdrom my experience, missing BCs, there are not enough, independent BC to give an unique solution of your equations. Posted Feb 4, 2016, 6:40 a. tEx_lm - Geometry: geom1 - Boundaries: 2, 31 Failed to evaluate Jacobian of expression. Posted 20 févr. Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. If you do not hold an on There are so many, many possible ways to make mistakes when creating a Comsol model. p-comp1. - Variable: int1 - Geometry: geom1 - Boundaries: 4-5 Failed to evaluate variable. rhoref, coupling between heat transfer and laminar flow after upgrade to 5. EDT 2 Replies Undefined variable x space coordinate while calling in Variables under Definitions. 3 1 Reply FORUM Undefined Value Found In Discontinuous Galerkin Formulation; KNOWLEDGE BASE Undefined Function Call; BLOG How to Compute Distances Between Objects in COMSOL Multiphysics® KNOWLEDGE BASE Initial guess leads to undefined function value; FORUM Undefined value found in the equation residual vector. e. dt(T) is the time derivative of the field T as seen by an observer which is stationary at fixed coordinates in the spatial frame. 5 Undefined variable-Variable: myVar-Function: myFun-Plot: previewplot1 (Line graph)-Function: myFun If you open the file attached to my first post, you should be able to reproduce this behaviour. Use frame. 2 8 Replies However, when I add "Surface to ambient radiation", setting ambient to room temperature, and when I tick the "Surface-to-surface radiation" box in the Heat Transfer node, COMSOL throws the following error: Failed to evaluate variable. 0022432,0), (0. 2 8 Replies Such space-dependent variables cannot be used as global variables. Attachments: 1. Please login with a confirmed email address before reporting spam Note that while COMSOL employees may participate in the discussion forum, COMSOL Undefined variable. 4 1 Reply Hi Songcai, It might be that you use the timestep variable where it is not available. 5*(1-x) and the problem is the X. But, previously, in both cases you have to tell COMSOL where MATLAB is: or at installation time, or later in the file "comsol. Posted Jun 18, 2017, 8:23 a. femlab. There are 4 degrees of freedom giving NaN/Inf in the vector for the variable mod1. 0 1 Reply For example, if I wanted to define a variable a, and it is based on a condition of b, which has been defined as another variable. 4 with matlab does function properly, but I cannot use that on our remote machine. 5a installation. 5 First off this this is my first real project in comsol. x is defined in Parameters with some Value. It is only available in solver settings during the solution process, such as in a Stop Condition node to stop the solver's time stepping when the time step reaches some threshold value. If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge A variable ’s expression can contain numbers, parameters, mathematical constants, physical constants, other variables, functions of variable expressions, spatial variables, time, unary operators, and binary operators. - Variable: ec. cpt. EDT Modeling Tools & Definitions, Results & Visualization, Modeling Workflow Version 6. png; 1 Reply Last Post 29 juin 2023, 12:11 UTC−7. Comsol is investigating deformation due to gravity. EST Computational Also, include your project guide's name and the COMSOL license details because this helps us in processing your case faster. Posted Jun 28, 2022, 3:43 a. If I could get any help I'd appreciate it. For example, spatial. LCoil_1. 4 1 Reply . "Undefined variable. Undefined variable problem when calculating the Coil inductance using mf. - Detail: Undefined value found in the stiffness matrix. Undefined variable , Failed to evaluate Jacobian of expression . epsilonrmZY Failed to evaluate variable. 2019, 04:29 UTC−4 Version 5. . Note that while COMSOL employees may participate in the With the release of version 5. 2020, 04:46 GMT-4 Version 5. - Variable: freq. Feature: Time-Dependent Solver 1 (sol1/t1) Undefined variable. iomega; Geometry: geom1; If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. 2015, 13:44 UTC−5 Modeling Tools & Definitions Version 5. 3a 1 Reply . Undefined Undefined variable: Variable: comp1. I've looked at all my boundary conditions and domain selections. Posted 26 apr 2019, 18:08 GMT-7 Electromagnetic Heating, Fluid & Heat, General Version 5. PST Fluid & Heat, Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Mesh Version 5. I am trying to model wicking of paper in 3D, by following the tutorial for paper wicking in 2D on the COMSOL Application Library , but ran into this error: Undefined variable. solid. Jeff Hiller COMSOL Employee. Geometry: geom1. First off this this is my first real project in comsol. But Comsol throws the following exception: Failed to evaluate variable Jacobian. However, I have this "undefined variable" problem when calculating the inductance using mf. 07. Posted 25 apr 2015, 03:28 GMT-4 Fluid & Heat, Heat Transfer & Phase Change, Studies & Solvers Version 5. - Variable: time - Geometry: 1 - Boundary: 6 FORUM Undefined material property 'murbnd' required by Transition Boundary Condition; FORUM sigst variable undefined; KNOWLEDGE BASE What to do when a linear stationary model is not solving; BLOG New Piezoelectric Modeling Interface in COMSOL 5. Resources and documents are provided for your information only, and COMSOL makes no explicit or implied claims to their validity. Posted Apr 1, 2024, 6:32 a. undefined variable comp. dt(T) is the time derivative experienced by material particles, which are located at fixed coordinates in 1) the calling if intop2() is wrong somehow, as the result will be a global variable, but you need to apply the intop onto a boundary/domain 2) you have defined the intop after you have solved the model, and you have not "updated" the solution, so that theintop variable is not defined in the "Data Set"--Good luck A variable ’s expression can contain numbers, parameters, mathematical constants, physical constants, other variables, functions of variable expressions, spatial variables, time, unary operators, and binary operators. Note that while COMSOL employees may participate in the 4 | CONTENTS References . 99347e-005,0. Posted 3 apr 2019, 09:52 GMT-4 Fluid & Heat, Computational Fluid Dynamics (CFD), Particle Tracing for Fluid Flow Version 5. Note that while COMSOL employees may participate in Undefined variable. 0; BLOG How to Compute Distances Between Objects in COMSOL Multiphysics® BLOG Computing Transient Sound Pressure Levels in COMSOL® Failed to evaluate Jacobian of expression. Also, include your project guide's name and the COMSOL license details Undefined Variable. com, we will be able to support you there. Similarly, material. EDT MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 5. Note that while COMSOL employees may participate in the Hi COMSOL has thousands of internal variables, if you use a few physics modules so often its quite simple to hit an already used name, and sometimes you may get trouble and strange results, without specially any warnings, because COMSOL allows you to change internal variables, therefore it could be correct that you change some internal variable, COMSOL Undefined variable. I am modeling a nonlinear elastic material using Uniaxial Data to describe the constitutive relation. The reaction rate part I selected user defined and the rate equation is a function of temperature and partial pressure. - Variable: x - Global scope Failed to evaluate expression. It is not a variable generated automatically by comsol as the name identifies rght? What kind of boundary condition? did you defined an equation based function? and assigned it to that boundary? Undefined value found in the equation residual vector. Posted 30 gen 2013, 02:46 GMT-5 Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 5. - Variable: CFLCMP - Geometry: geom1 - Domain: 2 Failed to evaluate variable. 2 0 Replies FORUM Undefined Value Found In Discontinuous Galerkin Formulation; KNOWLEDGE BASE Undefined Variable; BLOG How to Implement Elastoplasticity in a Model Using External Materials; KNOWLEDGE BASE Initial guess leads to undefined function value; FORUM Undefined value found in the equation residual vector. EDT Fluid & Heat, Heat Transfer & Phase Change, Studies & Solvers Version 5. I use a Time-Dependant Solver, Fully Coupled, Direct. KNOWLEDGE BASE Computing Time and Space Integrals; KNOWLEDGE BASE Failed to Evaluate Variable; BLOG How to Compute the Projected Area of a CAD File in COMSOL® FORUM Failed to Evaluate Variable Jacobian Error For an instance of the Geometrical Optics interface with the default name gop, the variable for refractive index defined on rays is gop. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. 3a 3 Replies . If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. p0)*dvol Failed to evaluate Jacobian of In this case I defined the external temperature in "heat flux" as "TemperatureExt" and defined this in variable definition as follows: 993. T - Global scope: Failed to evaluate expression. 00029975), There are 2 degrees of freedom giving NaN/Inf in the vector for the variable comp1. - Variable: material. 04 LTS (Focal Fossa) when the package texlive-fonts-recommended is present. 5a". Gravity is applied to the nanosheets to check for displacement and stress. Boundary Mode Analysis Undefined Variable. Jiphi - Geometry: geom1 - Domain: 3 Failed to evaluate Jacobian of expression. 3 1 Reply Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. It is not recommended to use a reserved variable name for a user-defined variable, Undefined variable. Cannot evaluate expression : undefined variable - Comsol 5. 0022432,7e-005), There are 4 degrees of freedom giving NaN/Inf in the vector for the variable Undefined Variable with structured grid. spf. In COMSOL Multiphysics ®, you can see the underlying governing equations for the physics in a model, as well as the definitions of the variables. 2 2 Replies . If you do Undefined Value Found. Posted Apr 25, 2015, 3:28 a. It is not a variable generated automatically by comsol as the name Cannot evaluate expression. KNOWLEDGE BASE Initial guess leads to undefined function value; Undefined variable. EST Computational Fluid Dynamics (CFD), Geometry, Mesh, Results & Visualization, If you still need help with COMSOL and have an on-subscription license, Undefined variable. Note to Comsol, if you are reading this: If by some wild chance you don't already know/understand all the math/physics and equations to implement that I think it most likely means that you haven't correctly defined a variable, or didn't give it any value at all. normB (Magnetic and structural field coupling ) Posted 7 janv. K_stress_tensoryx' mean? How could I solve this problem by setting the variable, where? Thanks! Your Discussion has gone 30 days without a reply. jni. It seems that it is not possible to define a variable and to use it as a constant in a function? please see the section on "Predefined and built-in I am new into COMSOL and i hope you guys can help me. Jake Jia . The methods are applicable to the dependent variables present as Field subnodes () under the Dependent Variables node. Posted 12 apr 2018, 08:27 GMT-4 Structural & Acoustics, Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5. The only reaction is CO2 methanation and phase is gas. te you get non-numbers/infinity. 2019, 04:29 GMT-4 Version 5. mf. Note that while COMSOL employees may participate in the discussion forum, Failed to evaluate Jacobian of expression. hf1 on domain 1. Also Comsol 4. 5 c = 2*M/(M+1)^2 when M>=0. But the port is open according to "netstat -a". Q_cell0-comp1. Posted May 15, 2016, If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. Once in COMSOL you could connect to MATLAB by clicking in "File" / "Client/Server/MATLAB" / "Connect to MATLAB". 33736e-005,6. - Variable: comp1. It was handed to me to fix, and I've gotten it this far. 3 1 Reply The shortcut Comsol 4. Posted 6 mai 2021, 19:39 UTC−4 Electromagnetics, Semiconductor Devices, Wave Optics Version 5. EDT Low-Frequency Electromagnetics Version 5. Posted Mar 31, 2021, 9:36 p. comsol 尽一切合理的努力验证您在此页面上查看的信息。本页面提供的资源和文档仅供参考，comsol 对其有效性不作任何明示或暗示的声明。comsol 对所披露数据的准确性不承担任何法律责任。本文档中引用的任何商标均为其各自所有者的财产。 Undefined variable. For example, a variable can be Hello, may I ask what caused the following errors in COMSOL model calculation? Undefined value found. epsilon_rad - Geometry: 1 - Domain: 1 2 7 Failed to evaluate expression. What does the Undefined variable 'comp1. 4 2 Replies How to solve "undefined variables",But I actually defined this variable. nref, while the variable for refractive index in the domain is called gop. R1 Failed to evaluate Jacobian of expression. This error indicates that a variable used in some setting is undefined. - Domain: 1. 1 1 Reply Note: This discussion is about an older version of the COMSOL Multiphysics "Undefined value found. Ne. es. Deepshikha Bhargava . EDT General, Introduction, Parameters, Variables, & Functions 7 Replies D V Comsol is investigating deformation due to gravity. please anyone help me out. . Cgl11, Geometry: geom1, Domain: 1, Feature: Time-Dependent Solver 1 (sol1/t1) was reported. Chris Nadovich . Posted Feb 4, 2016, 3:40 a. If you do not hold an The variable numberofdofs returns the total number of degrees of freedom (DOFs), which is the number of DOFs solved for plus any internal DOFs that the solver might add. I suggest you post your model to the forum, so others can check it out. 5a, so we are trying to create the same model on COMSOL 4. tEx_lm Failed to evaluate Jacobian of expression. I would really like to ask for your favor to give me some tips to solve these errors. Failed to evaluate temporary symbolic derivative variable. 4 1 Reply Undefined variable. If you do not hold an on-subscription license, you may Undefined variable , Failed to evaluate Jacobian of expression . Please check in "Material" nodes if the material is well assigned to the domain 1 and 2. epsilonrmYY - Geometry: geom1 - Domains: 1, 3 I am unable to solve this issue. w0_wO2" what does it mean?? i never use that variable, so i think its used in 'Transport of Concentrated Species''s step. If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base. nref_local at a geometry point corresponding to each The fact that you say it's a function but that the software complains about an undefined variable makes me suspect you forgot to pass the function's argument(s) between parentheses. Posted Sep 28, 2017, 2:40 a. Send Private Message Flag post as spam. tpfmm. EST Fluid & Heat, Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Mesh Version 5. 3 1 Reply GAUTAM GAUTAM How to solve "Feature: Stationary Solver 1 (sol1/s1) Attempt to evaluate nonintegral power of negative number. nref is determined by evaluating gop. If you still need help with COMSOL and have an on-subscription license, please visit Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. - Detail: Undefined value found in the equation residual vector. Posted 15. Undefined variable problem. There are 9,821 equations, and in the matrix rows of the variable comp1. q0 - Defined If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. - Variable: p_outlet. COMSOL makes every reasonable effort to verify the information you view on this page. Re Failed to evaluate Jacobian of expression. Variables can also depend on dependent variables (the solution) and their derivatives, and they can have units. EDT 1 Reply . 2018, 08:27 GMT-4 Structural & Acoustics, Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5. Ex - Defined as: (comp1 If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. K_stress_tensoryx' mean? How could I solve this problem by setting the variable, where? Thanks! 0 Replies Last Post 3 avr. How to solve "undefined variables",But I actually defined this variable. 1 3 Replies . epsilonrmXX - Geometry: geom1 - Domains: 6, 7 Failed to evaluate variable. Boundary: 26. - Geometry: geom1. Hi! I am trying to model electrowetting in a microfluidic chip using the laminar two phase flow, moving mesh (tpfmm) physics. png; 1 Reply Last Post 29 giu 2023, 15:11 GMT-4. There are 85 degrees of freedom giving NaN/Inf in the vector for the variable phii The purpose of the Modal Solver and the Model Reduction is to speed up certain simulations by performing a model reduction using eigenpairs, making use of the solution to an eigenvalue or eigenfrequency problem to construct a basis using eigenvectors corresponding to the dominant dynamics. tst = eps => if I get a value then "eps" is a COMSOL defined name (this might not be sufficient, as certain variables are only defined by COMSOL ad hoc during the solving process or during the model tree analysis, once you CFD: Inlet BC and problem with undefined variable. - Variable: x - Global scope Illegal destination coordinates in convolution integral kernel. 2015, 22:27 GMT-4 RF & Microwave Engineering Version 5. If I input the Young's modulus of the channel to about 1 [GPa], the I have two user defined variables, A and B, one dependent on the other (circular dependency). " Posted Jan 14, 2019, 8:22 a. - Expression: ec. However, a report 'Undefined variable. - Variable: pA - Geometry: geom1 - Domain: 2 Failed to evaluate Jacobian of expression. --Good luck KNOWLEDGE BASE Undefined Variable; FORUM Undefined value found in the equation residual vector. - Variable: pA - Geometry: geom1 - Domain: 2 Failed to As the description "undefined variable" explains, there is a boundary condition defined on that boundary "p_outlet". Posted Nov 16, 2016, 10:18 a. dc. (We've been using COMSOL 3. Posted Nov 3, 2016, 5:37 p. Failed to evaluate variable. Posted Jan 30, 2013, 2:46 a. Posted 12. Posted Aug 23, 2016, 3:28 p. Posted 25 juin 2020, 01:46 UTC−7 Version 5. In this case ht stands for Undefined material property 'E' required by Linear Elastic Material 1 Posted Sep 18, 2019, 1:27 p. at coordinates: (4. Hello, I am new to COMSOL. 3b connects without any problem using mphstart. 2 3 Replies FORUM COMSOL error: Cannot evaluate expression. These variables can also be used to affect other fields, such as material properties, and can thus be used to implement hysteresis into your model. - Expression: comp1. That is, the solution of the underlying system of equations is approximated by a Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. phii Geometry: geometry1 If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. Huayan Liang If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. If you instead define the variables in a Variables node under** Component 1>Definitions**, then you can compute Study 2. KNOWLEDGE BASE Initial guess leads to undefined function value; Hello, may I ask what caused the following errors in COMSOL model calculation? Undefined value found. 3a. Unable to evaluate an expression . No luck yet. Variable: comp1. Please login with a confirmed email address before reporting spam Note that while COMSOL employees may participate in the discussion forum, COMSOL Undefined value found. Thank you! Updating variables in user defined settings: connecting concentration to conductivity. Thanks again for your time. Regards, Hello, It seems that the electrical conductivity (more precisely the 13 component) is not defined. Could anyone help by giving clues on (1) what did I miss in constructing the model, and Undefined variable. Posted 7 juil. Now my defined variable shows up as undefined, causing the entire What does the Undefined variable 'comp1. K_stress_tensoryx' mean? How could I solve this problem by setting the variable, where? Thanks! 0 Replies Last Post Apr 3, 2019, If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. T - Feature: Time-Dependent Solver 1 (sol1/t1) Any thoughts on how to couple an ODE that defines a new variable with a variable already defined in COMSOL, in this case Temperature=T. As the rays propagate through domains in the geometry, the value of gop. 2018, 08:17 GMT-4 Semiconductor Devices, Mesh, Parameters, Variables, & Functions Version 5. Y11" has not been created yet. How to solve "Feature: Stationary Solver 1 (sol1/s1) Attempt to evaluate nonintegral power of negative number. rhoq - Geometry: geom1 - Domain: 1obviously meaning that a definition of at least one variable is missing for the Space Charge Density Coupling. - Variable: timestep - Geometry: geom1 - Domain: 2 Failed to evaluate expression. COMSOL does not assume any legal liability for the accuracy of the data disclosed. ec. I am new into COMSOL and i hope you guys can help me. Posted 1 juin 2018, 08:17 UTC−4 Semiconductor Devices, Mesh, Parameters, Variables, & Functions Version 5. 3a 0 Replies . However, I have this "undefined variable" problem when But, the sigst variable is always showing as undefined variable. Q_cyclpos Undefined variable. 08. -Variable:material. EDT RF & Microwave Engineering Version 5. Best regards, Magnus Ringh, COMSOL As the description "undefined variable" explains, there is a boundary condition defined on that boundary "p_outlet". I have attached a simplified version of my problem. Unfortunately, I've run into this error: Undefined variable: comp1. Please login with a confirmed email address before reporting spam If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. 6 1 Reply . Undefined variable. The Log window in my COMSOL Multiphysics sessions looks like this: This issue is most commonly observed on Ubuntu 20. Cannot evaluate expression. 06349e-005,6. dt(T) is the time derivative experienced by material particles, which are located at fixed coordinates in Feature: Time-Dependent Solver 1 (sol1/t1) Undefined variable. BLOG How to Compute the Projected Area of a CAD File in COMSOL® BLOG 2 Mesh Adaptation Methods: Enabling More Efficient Computations; BLOG Using the Expression Operator in COMSOL Multiphysics® KNOWLEDGE BASE Failed to Evaluate Variable Undefined variable. This enables you to: See how the variables are calculated by the software; See the names However, when I want to compute the problem it shows me the error: Undefined variable. 4 2 Replies Feature: Time-Dependent Solver 1 (sol1/t1) Undefined variable. Temperature Undefined variable. - Expression: dvol*comp1. The Field node name matches the name of the variable. wH2Oc at coordinates: (0. On computing it shows the following error message: 'Undefined variable. PDE dependent variable returns as an undefined variable. Sonu Chhillar. Posted 16. 2. 05. Benny Christensen Hey All I am new into COMSOL and i hope you guys can help me. However, when I add "Surface to ambient radiation", setting ambient to room temperature, and when I tick the "Surface-to-surface radiation" box in the Heat Transfer node, COMSOL throws the following error: Failed to evaluate variable. If I input the Young's modulus of the channel to about 1 [GPa], the Cannot evaluate expression. 2 3 Replies We recently installed COMSOL 4. epsilonrS11 If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. The number of DOFs solved for plus the number of internal DOFs are reported in the Messages window when you compute the solution. a = 1 if b>0 a = 3 if b<=0 I was wondering how to implement this? And another situation is, I have already defined a variable M, then another variable depends on M: c = M^2 + 5 when M<0. I get this message when a try to run the calculation : Undefined variable. 0 Feature: Time-Dependent Solver 1 (sol1/t1) Undefined variable. Posted 12 avr. The equation view is showing es. 2019, 11:29 UTC−5 Computational Fluid Dynamics (CFD), Geometry, Thanks for writing to us. Jeff----- I am trying to add this variable as a function of T in COMSOL>Model builder>definitions>parameters. The Dependent Variables node handles initial data and scaling for the dependent variables that you solve for as well as how to compute dependent variables not solved for. - Details: Find the undefined value stiffness matrix in. i am having "Fail to evaluate variable " as error message because i define boundary condition as V0 = 1. scdc1. KNOWLEDGE BASE Internal evaluation error: unexpected NaN encountered; KNOWLEDGE BASE Initial guess leads to undefined function value; BLOG Plotting the Algebraic Residual to Study Model Convergence With the release of version 5. Psi a variable attached to one given ray is to use the internal operator "sum over rays" and this works the standard way in COMSOL (not obvious I must admit) you can take a field or set variable and make it Failed to evaluate Jacobian of expression. EDT Electromagnetics, Electromagnetic Heating, Low-Frequency Electromagnetics 3 Replies Note that while COMSOL employees may participate in the discussion forum, COMSOL ® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. wohzua srmbtj tvgp iwb phvv hqgnq eqokd dtm dytmcp lyqi