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Forum: CFX

December 15, 2010, 17:44

Replies: 7

open channel flow-sst model

Views: 1,544

Posted By ghorrocks

Because a mesh using wall functions and a first...

Because a mesh using wall functions and a first node will have a smaller mesh by a factor of at least 15, and probably more like 100. That means 100 times less memory requirements and run time.

If...

Forum: CFX

December 15, 2010, 04:55

Replies: 7

open channel flow-sst model

Views: 1,544

Posted By ghorrocks

SST can handle the first node at y+>11 just fine....

SST can handle the first node at y+>11 just fine. You don't need to integrate to the wall.

Forum: CFX

December 14, 2010, 16:31

Replies: 7

open channel flow-sst model

Views: 1,544

Posted By ghorrocks

You are right, you can model rough walls while...

You are right, you can model rough walls while integrating to the wall. But it does not sound like a good idea, unless you need detailed information about the boundary layer then it would be best to...

Forum: CFX

December 14, 2010, 05:46

Replies: 7

open channel flow-sst model

Views: 1,544

Posted By ghorrocks

I don't think you can do hydraulically rough flow...

I don't think you can do hydraulically rough flow without wall functions (ie y+>11). You should not integrate to the wall for this type of flow.

So put the first node at about y+=15, and grade out...

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