which model is suitable?
Dear Friends,
In CFX, which model is better for calculate high speed(M =1), compressible air? K-e model?? Thank you in advance. Eric |
Re: which model is suitable?
SST
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Re: which model is suitable?
Thank you.
And which is better, upwind or high resolution? Thank you in advance |
Re: which model is suitable?
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 |
Re: which model is suitable?
Many Thanks
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Re: which model is suitable?
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. |
Re: which model is suitable?
I agree with Phil. Only use upwind to get a solution started. Always switch to high res for final solution.
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Re: which model is suitable?
Johnny is right
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Re: which model is suitable?
Upwind = You are more likely to get a "conservation satisfying" answer but it is wrong.
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