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Cantilever beam with distributed load modeling

Posted Dec 22, 2010, 10:43 p.m. EST MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Studies & Solvers, Structural Mechanics 3 Replies

Osman Mosa
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I want to simulate a cantilever beam fixed from one side and having a distributed load on one of its faces. I made a lot of changes and i simplified it very much, however i still receiving that 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 1808, (Undefined value found in the equation residual vector.
There are 352828 degrees of freedom giving NaN/Inf in the vector for the variable u
at coordinates: (1.24935e-005,9.51916e-005,0.00025), (9.99349e-006,9.76916e-005,0.00025), (1.06185e-005,9.36283e-005,0.00025), (9.98698e-006,9.53832e-005,0.00025), (7.48047e-006,9.55748e-005,0.00025), ...
There are 352828 degrees of freedom giving NaN/Inf in the vector for the variable v
at coordinates: (1.24935e-005,9.51916e-005,0.00025), (9.99349e-006,9.76916e-005,0.00025), (1.06185e-005,9.36283e-005,0.00025), (9.98698e-006,9.53832e-005,0.00025), (7.48047e-006,9.55748e-005,0.00025), ...
There are 352828 degrees of freedom giving NaN/Inf in the vector for the variable w
at coordinates: (1.24935e-005,9.51916e-005,0.00025), (9.99349e-006,9.76916e-005,0.00025), (1.06185e-005,9.36283e-005,0.00025), (9.98698e-006,9.53832e-005,0.00025), (7.48047e-006,9.55748e-005,0.00025), ...
)
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.ae.run(Unknown Source)

Please help me !
3 Replies Last Post Dec 23, 2010, 9:24 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Dec 23, 2010, 3:04 a.m. EST
Hi

this means, from my understanding, that your model is not fully defined, typically too few BC to have an unique solution

--
Good luck
Ivar
Hi this means, from my understanding, that your model is not fully defined, typically too few BC to have an unique solution -- Good luck Ivar
Osman Mosa
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Posted: 1 decade ago Dec 23, 2010, 7:59 a.m. EST
I have defined one of the faces to be fixed, and all the remaining 5 faces to be free and one of them has a load on it.
what else i have to define.
I am appreciating your help.
I have defined one of the faces to be fixed, and all the remaining 5 faces to be free and one of them has a load on it. what else i have to define. I am appreciating your help.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Dec 23, 2010, 9:24 a.m. EST
Hi

then check your material data if there is not a red flag therein, or if you do not have a domai or BC definition but wotout having selected correctly the items

--
Good luck
Ivar
Hi then check your material data if there is not a red flag therein, or if you do not have a domai or BC definition but wotout having selected correctly the items -- Good luck Ivar

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