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

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.

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

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!

Thanks Jaloha

I figured out how to find the pressure difference from post. I can use the expression areaAve(Pressure)@Outlet-areaAve(Pressure)@inlet. Thanks

Ahmed

Congratulations, I'm glad to hear that.