|March 1, 2012, 04:33||
Alternative modeling of an perforated plate (not as a porous medium)
Join Date: Feb 2012
Posts: 1Rep Power: 0
Is it possible to modelling a perforated plate as a “pressure drop” function of the velocity? I know I can realise that by a porous medium, but therefore I must generate a thin porous domain. Sometimes I got mesh-problems with that.
In CFX Pre is an Option for a “Domain Interface” called “pressure change”. Can I use that instead of a porous medium? Therefore I only need a baffle, which is easier to generate.
I have tried to model it by define the pressure drop as an expression:
-((velocity v)^2) * PressuredropCoefficient[kg m^-3]
But the simulation crashed after some iteration. (Velocity at monitor points rises up to supersonics)
If I use an averaged velocity, the simulation runs ok, but it is not physically correct….
-((areaAve(velocity v)@baffle_side1)^2) * PressuredropCoefficient[kg m^-3]
So anyone have an idea what I can do?
|March 1, 2012, 18:07||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,960Rep Power: 85
Looks like some numerical instability which is fixed by averaging across an area. I assume the averaging approach is not correct for your application as the flow varies across the plate. In that case I would consider breaking the plate up into several small bits and averaging inside each bit. Then you should get some resolution of the flow variation but still get some numerical stability.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Modeling of perforated plate for 3 phase fluidized||Sanyo||FLUENT||5||March 27, 2015 12:01|
|modeling perforated plate||mokemex||FLUENT||2||February 18, 2009 10:11|
|Perforated Plate with Porous Media||giogio||FLUENT||4||July 8, 2008 15:07|
|Modeling thin perforated plates as porous media||Mike||FLUENT||0||August 21, 2007 04:16|
|turbulence at a porous jump (perforated plate)||andrew||FLUENT||1||May 8, 2004 09:51|