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how to setup pressure boundary conditions?

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Old   November 17, 2010, 21:43
Post how to setup pressure boundary conditions?
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gary
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Hello
I want to use star-ccm to simulate water flowing in a duct. One side of this duct is connected with a very larger top-openned reservoir and the other side is applied with a negtive pressure [like vacuum pump] to suck water out. What kinds of pressure type should I define in inlet side at reservoir top face and outlet side ?
Thank you !!

Gary
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Old   December 14, 2010, 11:39
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wenjiewang
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inlet pressure outlet
outlet pressure outlet

并且需要预定义流速,否则反流比较严重
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Old   March 23, 2011, 15:14
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Mahbub Islam
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Inlet- Velocity Inlet

Outlet: Pressure Outlet

Most convenient BC for duct flow.
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Old   March 27, 2011, 00:55
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gary
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So, can I set the inlet side with 1 atm total pressure as a boundary condition; and 0.95 atm static pressure pressure as outlet condition ? [reference pressure = 0 atm]
As to the pre-defined velocity, should I set it in the initial condition?
Thanks !!
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Old   April 1, 2011, 19:09
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ara
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You can either do mass flow inlet or velocity inlet.
for outlet use stagnation inlet and choose a negative pressure.
pressure outlet does not work as well with negative pressures.

as far as initial conditions go: they are good for the first initial guess.
use the inlet conditions on the inlet boundary with no pressure.

set something for the reference pressure, i dont think ccm+ likes 0 reference pressure that much and adjust your outlet pressure accordingly.
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