Uniform flow simulation

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 May 27, 2014, 23:21 Uniform flow simulation #1 New Member   tsung han yang Join Date: Dec 2013 Posts: 12 Rep Power: 5 Dear Expert: I try to simulate a channel that the upstream is a steady inflow and downstream is outflow condition. Is that possible to have an uniform flow through this channel? My free surface drops down from upstream to downstream... Hope someone can help me, thanks

May 28, 2014, 05:02
#2
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Sugonghak PC Bang
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Quote:
 Originally Posted by robin781105 Dear Expert: I try to simulate a channel that the upstream is a steady inflow and downstream is outflow condition. Is that possible to have an uniform flow through this channel? My free surface drops down from upstream to downstream... Hope someone can help me, thanks
Uniform as in constant in flow depth (wrt to space)?

Easy, set the fluid elevation to the desired value you want (1m, 100m, etc). Then, it will not fluctuate along the channel.

p/s: I am not expert. Cheers!

May 28, 2014, 08:27
#3
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tsung han yang
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But I've set the channel with a roughness and there is no slope for the channel.
The water surface just like this
Attached Images
 plots_on_screen.jpg (36.2 KB, 46 views)

May 28, 2014, 20:49
#4
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Sugonghak PC Bang
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Try setting your fluid elevation like this (e.g. Zmax=0.2m)
Attached Images
 abc.jpg (38.9 KB, 30 views)

 May 29, 2014, 08:49 #5 New Member   tsung han yang Join Date: Dec 2013 Posts: 12 Rep Power: 5 You mean to set an initial fluid? But that's not a real fluid phenomena...

 June 2, 2014, 09:25 Downstream pressure boundary #6 New Member   John Chesterton Join Date: Jan 2014 Posts: 5 Rep Power: 5 To have flow from left to right you need some head difference (water surface slope) Apply a pressure boundary to the downstream end of the channel. The depth at the downstream boundary will be = the upstream fluid level - the friction slope * channel length. If the flow is not uniform you will need to adjust the channel roughness.

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