文档介绍：2010-09-16
Note of Porous Media
©2010 Eric FN1-1
Porous Media Model
• The porous media model can be used for a wide variety of single phase and
multiphase problems, including flow through packed beds, filter papers,
perforated plates, flow distributors, and tube banks.
• When you use this model,
– define a cell zone in which the porous media model is applied and
– the pressure loss in the flow is determined via your inputs
– heat transfer through the medium can also be represented
• A1DA 1D s imp lificati on of th e porous medi a mod el , termed th e “porous jump,”
– applied to a face zone, not to a cell zone,
– more robust and yields better convergence
– should be used (instead of the full porous media model) whenever possible
©2010 Eric FN1-2
1
2010-09-16
Limitations and Assumptions
• In essence, the porous media model is nothing more than an added
momentum sink in the governing momentum equations.
– Uses a superficial velocity inside the porous medium, based on the volumetric flow rate
•The Superficial Velocity Porous Formulation generally gives good representations of the
bulk pressure loss through a porous region.
• However, it cannot predict the velocity increase in porous zones and thus limits the accuracy of
the model.
– The effect of the porous medium on the turbulence field is only approximated.
©2010 Eric FN1-3
Mom