Inlet boundary condition

(morteza) · December 30, 2013, 01:36

Dear all,

I am going to specified upstream boundary condition at inlet of bottom outlet of a high dam. Now, is it necessary to simulate all of reservoir upstream water elevation or not?

Thanks

JBurnham · December 31, 2013, 12:43

No, it is not necessary to simulate all of the upstream reservoir, as long as you know the depth of the upstream reservoir acting on the outlet. Use a pressure-type boundary, and set the pressure at the boundary = Patm + RHO*g*h, with h = distance from the surface to the pipe.

December 30, 2013, 01:36	Inlet boundary condition	#1
(morteza) New Member morteza Join Date: Jun 2013 Location: iran Posts: 9 Rep Power: 13	Dear all, I am going to specified upstream boundary condition at inlet of bottom outlet of a high dam. Now, is it necessary to simulate all of reservoir upstream water elevation or not? Thanks sreddycfdforum and mina00 like this.

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December 31, 2013, 12:43		#2
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	No, it is not necessary to simulate all of the upstream reservoir, as long as you know the depth of the upstream reservoir acting on the outlet. Use a pressure-type boundary, and set the pressure at the boundary = Patm + RHOgh, with h = distance from the surface to the pipe.