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Old   October 10, 2011, 03:04
Default rough bed open channel flow
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Atiieh Rostami
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Dear F3D experts,
I am trying to simulate the free surface flow over rough bed (Ks=0.005 to 0.05m). I have some questions:
1-What's happen If the mesh sizes is smaller than roughness?
2-I set rough=ks, Is any other changes needed?
3-In rough bed problems, the boundary layer is too small and negligible. Can I use free slip condition in this problem? and how about "FRCOF"?

Regards
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Old   October 28, 2011, 00:58
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Yi-Lang Chen
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Quote:
Originally Posted by ati_ros61 View Post
Dear F3D experts,
I am trying to simulate the free surface flow over rough bed (Ks=0.005 to 0.05m). I have some questions:
1-What's happen If the mesh sizes is smaller than roughness?
2-I set rough=ks, Is any other changes needed?
3-In rough bed problems, the boundary layer is too small and negligible. Can I use free slip condition in this problem? and how about "FRCOF"?

Regards
Good questions, maybe you can reference Modeling Roughness Effects in Open Channel Flows ( Souders and Hirt, 2002)

http://www.flow3d.com/pdfs/tn/FloSci-TN60.pdf

Regards
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