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error in COMSOL:'ERROR:6164 Duplicate Variable' |
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#1 |
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Hello,
I am working on a model which has 'level set 2 phase flow --> chemical engineering module' and 'Axial symmetry, stress-strain with fluid interaction --> fluid structure interaction --> structural mechanics module'. basically i have a model in which there are 2 fluids of different density and low density fluid is at bottom initially. as it moves up, it will exert force on a flexible cantilever beam attached in midway. i am finding the effect on that beam including displacement and stresses. i am having following error 'ERROR : 6164' and following detail message. *********************************************** Exception: com.femlab.jni.FlNativeException: Duplicate variable name Messages: Duplicate variable name - Variable: r - Variable: rTIME - Variable: z - Variable: zTIME - Variable: r - Variable: rTIME - Variable: z - Variable: zTIME - Variable: r - Variable: rTIME - Variable: rr2 - Variable: rz2 - Variable: z - Variable: zTIME - Variable: zr2 - Variable: zz2 Stack trace: at xmodel.cpp, row 840, () at com.femlab.xmesh.Xmesh.meshExtend(Native Method) at com.femlab.xmesh.Xmesh.meshExtend(Unknown Source) at com.femlab.xmesh.MeshExtendRunnable.run(Unknown Source) at com.femlab.server.FlRunner.run(Unknown Source) at com.femlab.util.ad.run(Unknown Source) can anyone please show me what can i do in this situation? |
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#2 |
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Hi,
The explanation of this error message in the Diagnostics section of the COMSOL documentation says: A variable name has two different definitions. For instance, the same variable name appears two or more times for a dependent variable, a constant, an expression variable, or a coupling variable. Remove or rename one of the variables. In your case, you are combining two in themselves rather advanced interfaces: the level-set two-phase flow interface and an FSI coupled multiphysics interface. The FSI coupling includes an ALE application mode that provides a moving mesh, so there are two different "frames" in the model, as well as two different application modes for the fluid flow. It might be a good idea to first solve a simpler case and then add more physics incrementally. You can also contact the COMSOL support staff at www.comsol.com/support or support@comsol.com Hope this helps, Magnus Ringh COMSOL |
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