# pressure drop between inlet & outlet

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 June 12, 2008, 15:38 pressure drop between inlet & outlet #1 Ahmed Guest   Posts: n/a Hi guys I have a LES solution for a plane duct. I want to calculate pressure drop between inlet and outlet so that I can use that value to run the case with periodic BC. How do I calculate pressure between inlet and outlet from post. Thanks you for your help. Ahmed

 June 14, 2008, 03:56 Re: pressure drop between inlet & outlet #2 Jaloha Guest   Posts: n/a Hi，Ahmed, In CFX-Post, you can use the "export" function by selecting File-->Export, then in the prompted dialogue box, firstly choose a Location (in your case should be "Inlet" or "Outlet"); Secondly, select a variable(in your case should be "pressure") in the "Select Variable(s)" list box. Finally, click "Save", then a .csv file(can be opened by Excel) will be saved to the working directory. Data in the .csv file are the pressure values correspoding to different positions of the "Inlet"( or "Outlet") surface. I guess the values shall be nearly the same because the "pressure" variable stands for the "static pressure". After you get the two pressure values by this method, problem will be solved. I hope this helps.

 June 14, 2008, 06:43 Re: pressure drop between inlet & outlet #3 Ahmed Guest   Posts: n/a Hi Jaloha Thank you for your answer. I was looking for a single value of pressure. In other words I want to know what my pressure loss is within duct so that I can use that figure to run periodic case. Ahmed

 June 14, 2008, 09:13 Re: pressure drop between inlet & outlet #4 Jaloha Guest   Posts: n/a Hi，Ahmed I'm not sure if you have tried the method I suggested. You have to do that in two steps. First you get the pressure value of the inlet surface by exporting a .csv file, then do it again to get the pressure value of the outlet surface, so that you can get the pressure drop by calculating the difference between the two values. Hope you can make it. Good luck!

 June 14, 2008, 11:50 Re: pressure drop between inlet & outlet #5 Ahmed Guest   Posts: n/a Thanks Jaloha

 June 14, 2008, 12:05 Re: pressure drop between inlet & outlet #6 Ahmed Guest   Posts: n/a I figured out how to find the pressure difference from post. I can use the expression areaAve(Pressure)@Outlet-areaAve(Pressure)@inlet. Thanks Ahmed chaitanyaarige likes this.

 June 14, 2008, 13:49 Re: pressure drop between inlet & outlet #7 Jaloha Guest   Posts: n/a Congratulations, I'm glad to hear that.

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