# Pressure Loss Definition.

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 August 17, 2005, 08:21 Pressure Loss Definition. #1 Chirag Guest   Posts: n/a My problem domain has a sub domain (a perforated grid plate) in flow stream. For this, I know %age open area. How can I define it in CFX so that I can get exact flow behavior?

 August 17, 2005, 08:37 Re: Pressure Loss Definition. #2 Indrajit Guest   Posts: n/a U can create the same geomety using thin surface, that will be ideal one

 August 17, 2005, 09:02 Re: Pressure Loss Definition. #3 Chirag Guest   Posts: n/a Thanks Indrajit. But, how will I define pressure drop or %age opening for a thin surface? Also I can't model thousands of holes on that surface (perforated grid plate), as that will increase mesh size tremendously. Is there any other way out? Thanks again.

 August 17, 2005, 18:31 Re: Pressure Loss Definition. #4 Glenn Horrocks Guest   Posts: n/a Hi, Use a momentum source, or possibly a porous material. This will give you a number of pressure loss models to choose from so you can select the most appropriate one. Glenn Horrocks

 August 17, 2005, 23:51 Re: Pressure Loss Definition. #5 Chirag Guest   Posts: n/a I am trying to do it with "Momentum Source/Porous Loss Model" only. But I do not understand how to define X, Y & Z Cartesian Components under "Directional Loss Model" (when only available data to you is %age opening in grid plate)? Also, what else shall be defined in "Linear Resistance Coefficient" / "Quadratic Resistance Coefficient"?

 August 18, 2005, 07:12 Re: Pressure Loss Definition. #6 Michael Bo Hansen Guest   Posts: n/a I tend to use the Handbook of Hydraulic Resistance by Idelchik when I have to determine the pressure drop coefficient of grids and other flow restrictions.

 August 19, 2005, 13:50 Re: Pressure Loss Definition. #7 Robin Guest   Posts: n/a With CFX 10.0 there is a new "Pourous" Domain object. This allows you to specify both the volume fraction and the pressure drop characteristics. Regards, Robin

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