# porou jump, permeability

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 July 9, 2010, 09:33 porou jump, permeability #1 New Member   Join Date: Jul 2009 Posts: 8 Rep Power: 10 Hy all, I trying to set porous jump model in fluent to model 3D flow over perforated plate (cca, 10 mm in thickness). I computed inertial resistance and face permeability according to fluent 6.3 User guide 7.19.6 paragraph based on tabulated values of delta pressure - velocity (dp-c) dependence. The dp-c was determined based on detail fluid flow over element of the perforated plate. I approximated dp-c dependence by quadratic equation: dp=a*c^2 + b*c But the b coefficient is negative for my case and thus the permeability value (alfa) too. Problem is that fluent does not accept negative value of alfa. How to input the alfa? if I thing that the model with dp=.. -b*c is different to the dp=.. +b*c. By the way the value of alfa is rather small (of order of 1.e-7) - thus enhancing einfluence of inertial resistance. Order of C2 (inertial resistance coefficient) is cca 500 for the plate. Thanks.

 April 15, 2014, 23:52 #2 New Member   Join Date: Apr 2014 Posts: 29 Rep Power: 5 Hello, I am Having the same problem with the same procedure can someone please enlighten us. thank you.

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