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FloatinPoint Error in LES

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Old   March 19, 2004, 12:16
Default FloatinPoint Error in LES
  #1
Meri
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Hello, I have been strugling with a floating point error while using the Large Eddy Simulation method in CFX 5.6, I wondered if there is any one out here who has used this or if there is any verification work done. I know its a short in the dark, but I am kinda stuck Meri
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Old   March 21, 2004, 17:37
Default Re: FloatinPoint Error in LES
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Glenn Horrocks
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Hi Meri,

Floating point errors generally mean a very rapid local divergence. Assuming everything else is OK, in a transient problem the normal fix for this is to reduce the timestep size.

Glenn
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Old   March 22, 2004, 07:52
Default Re: FloatinPoint Error in LES
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Meri
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Glenn, Thanks a lot !, I reduced the time step to 0.0001s for a 2 sec simulation and its working fine.
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Old   March 22, 2004, 17:45
Default Re: FloatinPoint Error in LES
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Glenn Horrocks
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Hi Meri,

It is normal for an LES simulation to require a rediculously small timestep.

Glenn
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