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Old   September 28, 2011, 08:54
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, 09:43
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Glenn Horrocks
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ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
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, 10:49
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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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