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Solutions - All

• 1030: Error message: "Out of memory"
  
• 1029: My transient 3.3 model does not work in version 3.4

  I have a transient model that worked fine in COMSOL 3.3a but when I open it in version 3.4 and run it I get the error message Error: Time 0: Failed to find consistent initial values. Last time step is not converged.
  

  
  
• 1025: Level Set method for two-phase flow, how does it compare with the Volume of Fluid (VOF) method?

  I am new to COMSOL Multiphysics and have seen that you can use the Level Set method to track phase boundaries, for example in a rising bubble. I have heard of the Volume of Fluid method (VOF) before. What is the...
  

  
  
• 1024: 3.4 installation DVD hangs or reboots my Windows system

  When I insert the COMSOL 3.4 installation DVD, my Windows system reboots or hangs showing a blue screen.
  

  
  
• 1023: Support for RedHat Enterprise 5

  I cannot find RedHat Enterprise 5 on your System Requirements page. Is it safe to run COMSOL on that platform?
  

  
  
• 1022: Updating the COMSOL License Manager (Error: License server system does not support this version...)

  I just received the new license file for COMSOL 3.4. The first line in the license file starts with the word SERVER, which means a COMSOL License Manager is required. The COMSOL License Manager is currently running on...
  

  
  
• 1021: Thermal turbulent wall functions give incorrect heat flux

  In COMSOL Multiphysics 3.4 there is a problem with the thermal wall function boundary condition, which is available in the turbulent fluid-thermal interaction application modes. The result can be an incorrect heat flux...
  

  
  
• 1020: MATLAB 2007b window does not appear when started with COMSOL Multiphysics

  When I start COMSOL 3.4 with MATLAB 2007b, neither MATLAB nor the COMSOL Multiphysics user interface appear.
  

  
  
• 1019: Can I solve systems of nonlinear algebraic equations with COMSOL?

  Can I solve nonlinear equation systems with COMSOL?
  

  
  
• 1018: Error message: UnsatisfiedLinkError: libfldynload.so: libstdc++.so.6: cannot handle TLS data

  I use Debian Linux 3.1, 32-bit. When I start COMSOL 3.4 with MATLAB 2007a or MATLAB 2007b, the following error occurs: Exception:java.lang.UnsatisfiedLinkError: /usr/local/comsol34/lib/glnx86/libfldynload.so:...
  

  
  
• 1017: Error: Fatal exception occurred. Program will exit.

  During installation of COMSOL Multiphysics 3.4 on Windows 2000 or XP the, error message "Fatal exception occurred. Program will exit." or "Unsatisfied link error." appears.
  

  
  
• 1016: License borrowing in COMSOL 3.4

  How to borrow license keys on a floating network license
  

  
  
• 1015: Error: Error in callback, Error in built-in function javaMethod

  If you have a multicore machine, and start COMSOL Script in 32-bit mode with the Desktop environment enabled (for example on Windows, with the 32-bit start menu shortcut to COMSOL Script), while addressing more than...
  

  
  
• 1014: Error message: java: xcb_xlib.c:52: xcb_xlib_unlock: Assertion `c->xlib.lock' failed.

  I have SuSE Linux 10.3 or Fedora Core 8. When I start COMSOL, the following error occurs: java: xcb_xlib.c:52: xcb_xlib_unlock: Assertion `c->xlib.lock' failed. /usr/local/comsol34/bin/comsol: line 1655: 4457...
  

  
  
• 1011: Creating Flash® Animations from COMSOL results plots

  Suppose you want to create an animation of your model to put on a web page or maybe to include in a presentation. Using the built-in avi or Quicktime formats in such applications can sometimes be problematic due to...
  

  
  
• 1010: Error 7067, System matrix is zero

  I get the error message "Error 7067, System matrix is zero". What can it be?
  

  
  
• 1009: How do I model materials with gain/losses?

  I am using a time-harmonic application mode to solve an electromagnetics problem. If I want to introduce lossy materials, or materials with gain, what are my options?
  

  
  
• 1008: SolidWorks import: Error 1095, failed to load model...

  I imported a SolidWorks geometry and saved to an mph file. Next time I start COMSOL Multiphysics and try to open the mph file I get the error message:Error: 1095Failed to load model.- File name: C:\Mymodels\test.mph
  

  
  
• 1007: Solving Algebraic and Transcendental Equations

  How can I solve algebraic equations and transcendental equations in COMSOL?
  

  
  
• 1006: Calling external programs from COMSOL Script

  I have an external program I need to call from COMSOL Script, is this possible?
  

  
  
• 1005: Linking COMSOL to external functions

  Can COMSOL Multiphysics be connected to external functions written in other languages?
  

  
  
• 1004: Resolving the Skin Depth

  Why do the currents in my metal look strange? How can I get a realistic solution at high frequencies?
  

  
  
• 1003: Plotting the mesh together with the solution

  How can I see both the mesh and the solution of my COMSOL Multiphysics model?
  

  
  
• 1001: Running COMSOL in parallel mode

  This solution describes how you enable parallel use of the processors on a multicore or multiprocessor computer.
  

  
  
• 999: Error: ld.so.1, LMCOMSOL

  Why do I get a message about missing symbols when starting the COMSOL 3.3 License Manager on Sun? When lmgrd is started , the following error appears: ld.so.1: LMCOMSOL: fatal: relocation error: file LMCOMSOL:...
  

  
  
• 990: Error: 3016, Internal error CAD import.

  In COMSOL Multiphysics version 3.3 the following error message can occur on Linux and Sun platforms: Error: 3016 Internal error CAD import.
  

  
  
• 989: Does COMSOL support the Mac Intel platform?
  
• 987: MATLAB compatibility

  Which versions of MATLAB can I interface COMSOL Multiphysics to?
  

  
  
• 986: Error messages, general

  What is the meaning of the error message that Comsol Multiphysics gives me?
  

  
  
• 985: Warning message: Inverted mesh element near coordinates (x,y,z)

  Why do I get a warning about an inverted mesh element?
  

  
  
• 984: How to do a parametric study for a time dependent or an eigenvalue problem

  I want to solve a time dependent or an eigenvalue problem for many different values of a parameter. Can this be done automatically?
  

  
  
• 983: Error message: Internal Error in Geometry Decomposition

  Why do I get the error message “Internal Error in Geometry Decomposition”?
  

  
  
• 982: Axisymmetric plot swept to 3D

  How do I make a 3D plot from an axisymmetric 2D calculation?
  

  
  
• 980: Can I run COMSOL Multiphysics in batch mode?

  I would like to run my COMSOL Multiphysics computations in batch mode. If I have neither COMSOL Script nor MATLAB.
  

  
  
• 979: COMSOL Script or MATLAB? What is the difference?

  Is there any difference between interfacing COMSOL Multiphysics to MATLAB on one hand and using COMSOL Script on the other hand.
  

  
  
• 977: How do I turn an interior boundary into a perfect conductor in my In-Plane TM Waves model?

  I am using the In-Plane TM Waves application mode in the RF Module. I would like to embed a perfect electric conductor, but this boundary condition is available only for exterior boundaries. Why is this, and how can I...
  

  
  
• 975: Create a graphical user interface for customized applications

  I would like to generate my own graphical user interface for an application generated in COMSOL Script, or for a COMSOL Multiphysics model.
  

  
  
• 974: Error message: License Error - FLEXnet error -9 (Invalid host. The hostid of this system does not match the hostid specified in the license file.)

  I have a PC/Windows or a Macintosh computer with an NSL/CPU license for COMSOL Multiphysics. My COMSOL license file is locked to a network card/ethernet address. The application has been working fine for some time, but...
  

  
  
• 973: My flux calculation seems wrong

  I am solving a diffusion-like problem in COMSOL Multiphysics and discovered that boundaries that are defined with insulation/symmetry conditions have an integrated value of the normal component of the flux that is far...
  

  
  
• 971: Error message: FLEXnet error -84 (USER_BASED license has no specified users)

  I have a Named Single User License (NSL) for COMSOL Multiphysics and get an error message. When I click the "Details>>" button in the error message dialog box, the following error message is...
  

  
  
• 970: Improving convergence for ALE and parameterized geometry
  
• 968: Error message: FLEXnet Licensing error: -103

  I am getting an error message and when I click "Details>>" I can read the following log: Exception: com.femlab.jni.FlNativeException: License error Messages: License error Stack trace: at license.cpp, row...
  

  
  
• 966: Background and Theory References on Equation-Based Finite Element Analysis Used in COMSOL Multiphysics

  Where can I find documentation on the theoretical background of the algorithms and techniques used by COMSOL Multiphysics for Finite Element Analysis?
  

  
  
• 965: 3D Euler Beam coordinate system
  
• 964: Error message: Failed to find a solution: No convergence...

  I get this message: Failed to find a solution: No convergence, even when using the minimum damping factor. Returned solution has not converged.
  

  
  
• 962: Which element types are supported in COMSOL Multiphysics?
  
• 960: Error message: License error -15 Cannot connect to license server system

  I get this error message: License error -15 Cannot connect to license server system How do I fix it?
  

  
  
• 955: Optimization

  Can I do optimization in a COMSOL Multiphysics model?
  

  
  
• 953: Error message: Singular Matrix

  What does the error message "Singular Matrix" mean?
  

  
  
• 952: Negative concentrations

  Why do I get negative values of the concentration?
  

  
  
• 951: How do I calculate the capacitance matrix of a multiconductor system?

  I have set up a model of a number of conductors. How can I compute all the entries of the multiconductor capacitance matrix?
  

  
  
• 947: License manager error: TCP port number...

  I cannot run COMSOL Multiphysics on my system, and I get a license error message. When I look in the license manager log file I see this: 9:55:20 (lmgrd) lmgrd running as root: 9:55:20 (lmgrd) This is a potential...
  

  
  
• 945: Imposing both Neumann and Dirichlet condition on a single boundary

  I would like to solve the equation div(grad u) = 0 in 1D with the following boundary conditions: x = 0: u = 2 AND du/dx = 3 x = 1: no conditions imposed
  

  
  
• 942: How do I use coupling variables from the command line?

  How do I use coupling variables from the command line, for example to make periodic boundary conditions or impose an integral constraint in a script file?
  

  
  
• 940: How to create a helix geometry object in COMSOL

  How do I create a helix in COMSOL Multiphysics?
  

  
  
• 939: Can COMSOL Multiphysics handle polar, spherical, and cylindrical coordinates? And how is this done?

  Can COMSOL Multiphysics handle polar, spherical, and cylindrical coordinates? And how can I define these coordinates?
  

  
  
• 935: Interpolation of measured data

  I have data tables for my dependent material properties. For instance, I have values of the thermal conductivity at some different temperatures, and I have a map of permittivities versus coordinates. How can I get...
  

  
  
• 933: Troubleshooting graphics adapter problems

  Troubleshooting graphics adapter problems
  

  
  
• 923: Installation of COMSOL Multiphysics with hardware lock (dongle)
  
• 922: Why do I get an error when calling COMSOL Script functions from COMSOL Multiphysics ?

  When calling a COMSOL Script or MATLAB function from COMSOL Multiphysics, I get an error message such as Matrix power is only defined for square matrices.
  

  
  
• 921: Time-step control

  How does COMSOL Multiphysics determine the time-step size?
  

  
  
• 916: Electromagnetic coils: multi-turn with fixed total current and skin effect

  How can I model a multi-turn current-carrying circular or cylindrical coil with skin effect? How do I specify a fixed total current in each winding while leaving the spatial distribution of the current density free?
  

  
  
• 913: Computing Time and Space Integrals

  How do I compute time integrals in my time-dependent COMSOL Multiphysics model? How can I calculate a space integral?
  

  
  
• 909: Can COMSOL Multiphysics be used for TEM mode analysis?

  Can COMSOL Multiphysics be used for TEM mode analysis?
  

  
  
• 906: How do I extract the stiffness matrix of my problem?

  How do I extract the stiffness matrix of my problem?
  

  
  
• 905: Smoothed step transitions in COMSOL Multiphysics
  
• 903: License error -96, License error -15

  When the COMSOL license manager is running on a computer with an active firewall, and the COMSOL Multiphysics client is outside of that firewall, the client program displays the message "License error -96" or "License...
  

  
  
• 902: Thin film approximation, contact resistance
  
• 895: Can COMSOL Multiphysics handle left-handed materials?

  Can COMSOL Multiphysics handle left-handed materials?
  

  
  
• 881: Electromagnetic coils: Multi-turn without skin effect

  How can I model a multi-turn current-carrying coil in the DC and low frequency AC regime when the skin depth is much larger than the cross-section of the windings? Can I change the number of windings in the coil?
  

  
  
• 878: Should I use the RMS, the peak, or the instantaneous value to specify sources for electromagnetic fields?

  Should I use the RMS, the peak, or the instantaneous value to specify sources for electromagnetic fields? How can I specify the phase angle?
  

  
  
• 877: What are the relative and absolute tolerance for a time dependent problem?

  What are the relative and absolute tolerances (Rtol and Atol) for a time dependent problem? How do I know which values to give them? In the manual it says that the absolute tolerance can be a list of degree of freedom...
  

  
  
• 875: What is meant by degrees of freedom (DOFs) in COMSOL Multiphysics?

  What is meant by degrees of freedom (DOFs) in COMSOL Multiphysics?
  

  
  
• 866: What hardware platform do you recommend for COMSOL Multiphysics?

  I am going to buy a new computer for COMSOL Multiphysics. What hardware platform do you recommend? What about CPU speed and amount of RAM?
  

  
  
• 865: The inlet velocity is set as 4*Umax*s*(1-s). What does that mean?

  The inlet velocity profile in the model library model "Flow Past a Cylinder" is set to 4*Umax*s*(1-s). What does that mean ?
  

  
  
• 852: How can I model nonlinear magnetic materials?

  How can I model nonlinear magnetic materials? How can I introduce an experimental B-H curve?
  

  
  
• 850: Is there an 'open-boundary condition' for electrostatic or magnestatic simulations?

  I want to simulate an electrostatic or a magnetostatic problem in free space. How should I set up my simulation domain, and what boundary condition should I use at the exterior boundaries?
  

  
  
• 838: Can COMSOL Multiphysics import images?

  Can COMSOL Multiphysics import images?
  

  
  
• 830: Handling memory intensive models

  Handling memory intensive models
  

  
  
• 829: I want to extract my COMSOL Multiphysics data for external postprocessing.

  I want to extract my COMSOL Multiphysics data for external postprocessing.
  

  
  
• 828: Obtaining a Hostid for FLEXnet licensing

  How do I obtain the FLEXnet (formerly FLEXlm) Hostid?
  

  
  
• 816: How do I solve a PDE with space derivatives of order higher than two?

  How do I solve a PDE with space derivatives of order higher than two? For example, the equation uxxxx + uxxyy + uyyyy = f for a function u(x,y).
  

  
  
• 808: Can I compute the magnetic forces in COMSOL Multiphysics?

  Can I compute the magnetic forces in COMSOL Multiphysics?
  

  
  
• 800: Why use the option "reset model"?

  Why use the option "reset model"?
  

  
  
• 796: Problem with import of DXF files

  I have a problem with importing DXF files to COMSOL. What could be wrong?
  

  
  
• 786: Where can I purchase COMSOL Multiphysics?

  Where can I purchase COMSOL Multiphysics?
  

  
  
• 768: 3D slice plot of arbitrary shape

  Is it possible to get a slice plot at some other angle, i.e. not parallel to the coordinate planes? Can I even change its shape?
  

  
  
• 125: Integration over arbitrary cross section
  
• 124: Creating a COMSOL Multiphysics curve object from a 2nd degree polynomial
  
• 120: Meshing a thin geometry
  
• 114: Plot of contour lines on different surface plots in 2D and 3D

  How do I plot contour lines on slice plots, surface plots in 2D, isosurface plots, and on my boundary plots?
  

  
  
• 107: Command line associative geometry
  
• 103: Convergence problems at high reaction rates (large source terms)