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July 14, 2011, 19:35 |
CFX/Ansys FSI Error
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#1 | |
Member
Andrew Coughtrie
Join Date: May 2011
Posts: 51
Rep Power: 15 |
Hi all,
I was wondering if anyone had come across this error when running CFX with Ansys Multifield. The model is of an aortic heart valve in 2D. The problem is that the solution can't get past the first coupled step and the Ansys solver fails with the following error: Quote:
Any help would be greatly appreciated as this is driving me crazy, no matter what i do nothing seems to change. Thanks Andy |
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July 15, 2011, 10:58 |
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#2 |
Senior Member
Join Date: Apr 2009
Posts: 531
Rep Power: 21 |
The error means the Mechanical mesh distorted too much. Look at the forces sent from CFX (in the ANSYS.stdout) file and determine if they are reasonable. If not, look at the pressure on the wall in the CFX solution before it fails to figure out why. Since it fails in the first timestep you'll need to create monitor points for the force and displacement on the wall and enable "Monitor Coeff. Loop Convergence".
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July 19, 2011, 17:35 |
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#3 |
Member
Andrew Coughtrie
Join Date: May 2011
Posts: 51
Rep Power: 15 |
Thanks for the suggestions Stumpy they have been helpful in determining what the issue is. The pressure at the Fluid-Solid interface increases at each coupling step of the first time step. The pressure oscillates until it reaches +/-1E+06[Pa]. I've been unable to work out what is causing the solution in CFX to act as it does, I've tried different boundary conditions and altering the solutions control settings but they don't seem to change anything. Any suggestions?
I've attached the CCL file and an image of how the pressure monitor is acting if it helps anyone in determining a course of action I might be able to pursue. Thanks Andy |
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July 21, 2011, 15:57 |
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#4 |
Senior Member
Join Date: Apr 2009
Posts: 531
Rep Power: 21 |
This shows an unstable interface solution. Search the CFX forum for the thread with the title "FSI and size of time-step". Look for the discussion on applying a source term coefficient to stabilize things.
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December 4, 2017, 11:07 |
did you solved that problem?
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#5 |
Member
Join Date: Dec 2017
Posts: 34
Rep Power: 8 |
Dear Andrew,
I'm doing a FSI simulation and ecountered the same problem as you, have you solved that problem? If so, could you please let me know how? Thanks, Malek |
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Tags |
distorted elements, error ansys fsi, fsi, heart valve, multifield |
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