# Fluid Height

 Register Blogs Members List Search Today's Posts Mark Forums Read

 February 24, 2014, 21:47 Fluid Height #1 New Member   tsung han yang Join Date: Dec 2013 Posts: 12 Rep Power: 5 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" ?

 February 28, 2014, 20:32 #2 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 10 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. spaudel likes this.

 March 2, 2014, 11:21 #3 New Member   tsung han yang Join Date: Dec 2013 Posts: 12 Rep Power: 5 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?

 March 12, 2014, 22:03 #4 Senior Member   Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 10 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.

 March 18, 2014, 23:10 #5 New Member   tsung han yang Join Date: Dec 2013 Posts: 12 Rep Power: 5 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?

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post mhabibnia CFX 7 August 19, 2013 03:53 fjalil CFX 1 June 10, 2009 17:36 fjalil Main CFD Forum 0 June 10, 2009 13:47 Abhi Main CFD Forum 2 July 9, 2002 09:08 Abhi Main CFD Forum 12 July 8, 2002 09:11

All times are GMT -4. The time now is 17:28.