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How to give ' roughness height' in FLIUENT

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Old   March 3, 2006, 07:31
Default How to give ' roughness height' in FLIUENT
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Hi, I want to simulate the difference of flow between smooth wall and kinds of different rough wall. Now,I know k+=4.5 9.9 28.2 ,how can I give 'roughness height' in boundary condition?

thank you for helping me.
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