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Error: 7248

Posted Dec 22, 2011, 6:02 a.m. EST Fluid & Heat, Computational Fluid Dynamics (CFD), Materials Version 3.5a 0 Replies

Carla Cotas
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Hello,

I need simulate a turbulent pipe flow in comsol3.5a and the viscosity is not constant.
The viscosity depends on the shear rate and when I try to introduce the expression in Global Expressions as
Visc= m[Pa*s]*(Shear[s]+epsilon)^n and Shear = sqrt(0.5*(4*ur^2+2*(uz+vr)^2+4*vz^2+4*u^2/(r+eps)^2)+eps)
I have the error:

"Error: 7248
Undefined value found.

Exception:
com.femlab.jni.FlNativeException: Undefined value found Solvermodel
Messages:
Undefined value found Solvermodel

Stack trace:
at solvermodel.cpp, row 1837, (Undefined value found in the equation residual vector.
There are 2274 degrees of freedom giving NaN/Inf in the vector for the variable logd
at coordinates: (0.0352288,0.494039), (0.0366644,0.495068), (0.0354093,0.495682), (0.0381,0.496096), (0.0368449,0.496711), ...
There are 2270 degrees of freedom giving NaN/Inf in the vector for the variable logk
at coordinates: (0.0352288,0.494039), (0.0366644,0.495068), (0.0354093,0.495682), (0.0381,0.496096), (0.0368449,0.496711), ...
)
at com.femlab.solver.FlSolver.femStatic(Native Method)
at com.femlab.solver.FemStatic.run(Unknown Source)
at com.femlab.server.FlRunner.run(Unknown Source)
at com.femlab.util.i.run(Unknown Source)
at com.femlab.util.aa.run(Unknown Source)"

I don't know what I can do to solve this problem. Someone can help me...

Carla
0 Replies Last Post Dec 22, 2011, 6:02 a.m. EST
COMSOL Moderator

Hello Carla Cotas

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