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coarse mesh converges but fine mesh does not
Posted Aug 21, 2011, 6:44 p.m. EDT Fluid & Heat, Studies & Solvers Version 4.2 1 Reply
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Hi,
I have a model file that converges with a coarse mesh but it does not converge with a fine mesh. I am solving a stationary flow problem with FSI. I have tried several things like changing solvers from iterative to direct, using the coarse mesh solution to solve the fine mesh problem but I have had not success.
Anybody had any problems like this? Please let me know if you have any ideas that will help me resolve this.
Thanks,
Sirisha
I have a model file that converges with a coarse mesh but it does not converge with a fine mesh. I am solving a stationary flow problem with FSI. I have tried several things like changing solvers from iterative to direct, using the coarse mesh solution to solve the fine mesh problem but I have had not success.
Anybody had any problems like this? Please let me know if you have any ideas that will help me resolve this.
Thanks,
Sirisha
1 Reply Last Post Aug 22, 2011, 1:45 a.m. EDT
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Posted:
1 decade ago
Hi
have you done your validation and verification fully , as for FSi its rather important, for the fluidics, you need to ensure your flow regime is compatible with the initial conditions, to converge to something "correct", that your mesh is compatible with all dependent variable gradients, but also flow parameters such as the Raynolds number. The same for the structural.
coarse mesh does not necessarily mean wrong results, just as converging results does not necessarily mean correct results
all this is really very model and material parameter dependent, I find it difficult to define a "the correct check list" for FSI
--
Good luck
Ivar
have you done your validation and verification fully , as for FSi its rather important, for the fluidics, you need to ensure your flow regime is compatible with the initial conditions, to converge to something "correct", that your mesh is compatible with all dependent variable gradients, but also flow parameters such as the Raynolds number. The same for the structural.
coarse mesh does not necessarily mean wrong results, just as converging results does not necessarily mean correct results
all this is really very model and material parameter dependent, I find it difficult to define a "the correct check list" for FSI
--
Good luck
Ivar