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多孔跳跃边界条件

Porous Jump Boundary Conditions Porous jump conditions are used to model a thin "membrane'' that has known velocity (pressure-drop) characteristics. It is essentially a 1D simplification of the porous media model available for cell zones. Examples of uses for the porous jump condition include modeling pressure drops through screens and filters, and modeling radiators when you are not concerned with heat transfer. This simpler model should be used whenever possible (instead of the full porous media model) because it is more robust and yields better convergence.

The thin porous medium has a finite thickness over which the pressure change is defined as a combination of Darcy's Law and an additional inertial loss term:

多孔跳跃边界条件

(7.22-1)

where is the laminar fluid viscosity, is the permeability of the medium, is the pressure-jump coefficient, is the velocity normal to the porous face, and is the thickness of the medium. Appropriate values for and can be calculated using the techniques described in

Section 7.19.6.

User Inputs for the Porous Jump Model

多孔跳跃边界条件

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