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Fluid Height

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Old   February 24, 2014, 20:47
Default Fluid Height
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tsung han yang
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Dear expert:

I try to set the "Volume flow rate" boundary, so there needs to set both "Volume flow rate" and "Fluid Height".

There's a question, how can I set the "Fluid Height" when I fix the "flow rate" ?
How to know the true "normal flow depth" ?
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Old   February 28, 2014, 19:32
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Jeff Burnham
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You have to hand-calculate it, or know it from field data. The variable you must input is the water surface elevation (distance from the z = 0 plane), not depth.
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Old   March 2, 2014, 10:21
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Thanks JBurnham

It means I need to use Manning's equation to calculate the fluid depth?
Or Flow-3D has it's own equation to calculate fluid depth?
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Old   March 12, 2014, 22:03
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You need to know what the depth is at the boundaries. If this is an imaginary situation, then use Manning's. If it's real, then use field data. FLOW-3D can't do it for you because Manning's requires modeling all the way from the nearest critical control. That might be many kilometers! If necessary, use HEC-RAS to estimate the steady-state depths of the boundaries.
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Old   March 18, 2014, 23:10
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tsung han yang
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Thanks JBurnham!

I don't have the real data.

Is it feasible to determine the flow depth first then choose the water status to determine the discharge inflow?

y => Fr => Q=AV => get Q?

P.S.I'm a master student from Taiwan, my research is about weir flow.
If it possible, can I get your email and discuss with you?
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