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Old   February 4, 2009, 00:49
Default Turbulence
  #1
Abduri
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Im doing a FSI simulation and all equations converge except for the turbulence equation. With k-eps, I get a FINMES error. With SST, O-TurbFreq shows following lines at timestep 57 and 58:

57: | O-TurbFreq | 0.96 | 3.9E-03 | 1.4E-02 | 44.3 2.0E-06 OK|

58: | O-TurbFreq | NaN | NaN | 2.3E+00 | 11.8 0.0E+00 OK |

The other equations converge and the run ends normally. How come one of the turbulence won't converge?

These are my mesh values:

Minimum Orthogonality Angle [degrees] = 63.5 OK

Maximum Aspect Ratio = 82.0 OK

Maximum Mesh Expansion Factor = 3.6 OK

Cheers
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Old   February 4, 2009, 10:17
Default Re: Turbulence
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Rajee Assudani
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Does this error occur in the 1st iteration? If yes, you need to change the initial conditions. If not, try to change the mesh size.
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Old   February 4, 2009, 17:45
Default Re: Turbulence
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Glenn Horrocks
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Abduri,

Have you read the documentation on "obtaining convergence"? Also some more tips are here: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Glenn Horrocks
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