# Calculation of Drag Force per unit Length

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 January 10, 2008, 04:31 Calculation of Drag Force per unit Length #1 Mohammad Faridul Alam Guest   Posts: n/a Hi, I am running an unsteady simulation of flow past a 2D circular cylinder. I wanna know the way to calculate Drag force per unit length (D/length) in CFX-post. Thanks Farid

 January 10, 2008, 11:29 Re: Calculation of Drag Force per unit Length #2 CycLone Guest   Posts: n/a Calculate the drag. Divide by the length.

 January 11, 2008, 02:39 Re: Calculation of Drag Force per unit Length #3 Mohammad Faridul Alam Guest   Posts: n/a Hi, can you tell me for drag calculation which function I should use?

 January 11, 2008, 17:12 Re: Calculation of Drag Force per unit Length #4 CycLone Guest   Posts: n/a Hi Mohammad, You can use: force_x()@boundary or force_y()@boundary or force_z()@boundary You may need to do some trig to align it with your direction of motion if it isn't aligned with an axis. Replace "boundary" with the name of your boundary region or a surface group which includes all the relevant surfaces. -CycLone

 January 11, 2013, 08:19 terminal velocity #5 New Member   adel Join Date: Jan 2013 Posts: 1 Rep Power: 0 hi every body can help me about calculate drag cofficient and terminal velocity in a cyclone in fluent thank you

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