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-   -   How do I model a sub-critical flow with FLOW-3D? (https://www.cfd-online.com/Forums/flow-3d/109086-how-do-i-model-sub-critical-flow-flow-3d.html)

 abbaspwut November 8, 2012 17:31

How do I model a sub-critical flow with FLOW-3D?

Hi dear
I want to model a sub-critical flowin FLOW-3D.
When the height of the lower boundary is greater than of the upper boundary the water will enter the downstream boundary of the computational region.
As a result of my assumptions is destroyed.

 max0014 November 10, 2012 15:24

Quote:
 Originally Posted by abbaspwut (Post 391103) Hi dear I want to model a sub-critical flowin FLOW-3D. When the height of the lower boundary is greater than of the upper boundary the water will enter the downstream boundary of the computational region. As a result of my assumptions is destroyed. Please help me
I don't see why the water enters the downstream when height of the downstream boundary is greater than upper boundary?

 abbaspwut November 11, 2012 05:40

Why height of downstream is not more than height of upstream?
if y2>y1 then flow-3d enter water of downstream boundary condition.
y2=height of downstream
y1=height of upstream
i want y2>y1 and flow direction is upstream --> downstream but after Run flow direction is downstream --> upstream

 abbaspwut November 11, 2012 05:44

1 Attachment(s)
Quote:
 Originally Posted by abbaspwut (Post 391103) Hi dear I want to model a sub-critical flowin FLOW-3D. When the height of the lower boundary is greater than of the upper boundary the water will enter the downstream boundary of the computational region. As a result of my assumptions is destroyed. Please help me