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Old   September 28, 2011, 07:54
Default Question for 2D airfoil simulation
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Roland Rakos
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Hello,

In some cases I detect in my 2D simulations the next notice in convergence history:

U-Mom | 1.01 | 3.5E-06 | 7.4E-05 | 3.8E-05 OK
V-Mom | 1.00 | 2.8E-07 | 4.7E-06 | 1.0E-04 OK
W-Mom | 0.93 | 2.2E-29 | 1.6E-27 | 7.7E+11 *
P-Mass | 1.01 | 7.9E-09 | 2.2E-07 | 44.0 8.7E-01 ok

Based on the CFD online help:

"For the planar mesh the extrusion should be approximately equal to the smallest element edge length"

The mesh in my simulation is proper for this condition. Inspite of this the W-Mom is not OK. (Direction W is normal to the symmetry plane.)

What does it mean? How can I help the calculation?

Thanks
Roland
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Old   September 28, 2011, 08:43
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Glenn Horrocks
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The linear solver is not happy, but the residuals are very low. If it proceeds and converges with the other equations I would ignore it.
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Old   September 28, 2011, 09:49
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Roland Rakos
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Quote:
Originally Posted by ghorrocks View Post
The linear solver is not happy, but the residuals are very low. If it proceeds and converges with the other equations I would ignore it.
Based on the results your suggestion is correct really. By the way the * turned into OK after ~200 iterations.
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