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Old   February 23, 2007, 02:31
Default which model is suitable?
  #1
eric
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Dear Friends,

In CFX, which model is better for calculate high speed(M =1), compressible air? K-e model??

Thank you in advance.

Eric
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Old   February 23, 2007, 08:05
Default Re: which model is suitable?
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sam
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SST
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Old   February 23, 2007, 08:28
Default Re: which model is suitable?
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Eric
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Thank you.

And which is better, upwind or high resolution?

Thank you in advance

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Old   February 23, 2007, 10:09
Default Re: which model is suitable?
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Houman
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Hi Eric,

about upwind: it is more robust, needs less computaional time and is less accurate...

on the other hand, about high resolution: it is less robust, needs more computaional time, is more accurate and also need finer grid size...

so, you have to decide, which on fits to your problem more!!

Best regards, houman

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Old   February 23, 2007, 10:11
Default Re: which model is suitable?
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Eric
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Many Thanks

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Old   February 23, 2007, 10:20
Default Re: which model is suitable?
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Phil
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Just the opposite: high res, being more accurate (mostly second order rather than first order), actually requires a less fine mesh than upwind in order to achieve a mesh-independent solution.

High res is also (generally) quite robust - it is the default!

In general, avoid upwind.
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Old   February 24, 2007, 07:01
Default Re: which model is suitable?
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Johnny
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I agree with Phil. Only use upwind to get a solution started. Always switch to high res for final solution.
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Old   February 24, 2007, 10:24
Default Re: which model is suitable?
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sam
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Johnny is right
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Old   February 27, 2007, 18:48
Default Re: which model is suitable?
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HekLer
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Upwind = You are more likely to get a "conservation satisfying" answer but it is wrong.

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