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November 19, 2011, 20:24 |
icoFoam crash with unreasonable velocity.
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#1 |
New Member
Join Date: Jun 2010
Posts: 6
Rep Power: 16 |
Hello,
A question from an inexperienced OpenFOAM user. I am playing around with a simple manifold design and icoFoam. After 10 time steps everything looks more or less ok, but then suddenly the velocity increases to unreasonable values. I increased the resolution of the mesh with unchanged results. I have this problem generally with icoFoam that U increases until icoFoam crashes with a floating point error. I understand I am doing something wrong, so if someone could point me in the right direction I would appreciate it. Thank you. |
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November 20, 2011, 18:38 |
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#2 |
New Member
Join Date: Jun 2010
Posts: 6
Rep Power: 16 |
I think I found the reason for this problem.
After decreasing deltaT from 0.1 to 0.005 it seems to work good. Could be useful for anyone else who stumbles upon this problem.
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Mechanical Engineer |
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November 20, 2011, 20:48 |
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#3 |
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,912
Rep Power: 36 |
Hint: Check that the Courant number is < 1. If you need large time-steps, use pimpleFoam.
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Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. |
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crash, icofoam, openfoam |
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