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modelling rotating machinary

Posted Jul 6, 2012, 5:55 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD), Studies & Solvers Version 4.2 2 Replies

Babak Alizadeh
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Hi
I'm trying to model a turbo machine with a rotating machinery turbulent flow. There was a problem with compiling equations which its gone by decreasing the the time step (to 0.001s) however I don't know about the the second error which it's given as:

Failed to find consistent initial values.
Segregated group 1

Matrix has zero on diagonal.
Last time step is not converged.

anyone could help me to solve this problem?
meanwhile I'm attaching the geometry of my turbo machine.

Attachments:

2 Replies Last Post Jul 6, 2012, 1:15 p.m. EDT
Babak Alizadeh
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Posted: 1 decade ago Jul 6, 2012, 10:40 a.m. EDT
please help me with my problem how could I fix this error
please help me with my problem how could I fix this error
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jul 6, 2012, 1:15 p.m. EDT
Hi

one cannot really tell like that, but it will be a heavy model, have you considered to reduce it to a quadrant and use the symmetry, fluidics need very fine mesh, that could be too your issue just now

--
Good luck
Ivar
Hi one cannot really tell like that, but it will be a heavy model, have you considered to reduce it to a quadrant and use the symmetry, fluidics need very fine mesh, that could be too your issue just now -- Good luck Ivar

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