# Simulation of pressure drop

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 May 12, 2008, 04:13 Simulation of pressure drop #1 Christophe Guest   Posts: n/a Hi, I have to study the internal flow in a electrical engines cooling duct. I've got the main law of the pressure drop functions of the speed (real measures). The equation is like that : dP = a*V^2+b*V+c To simplify the whole model, i would like to replace the motor by a porous medium. My question would be : is it possible to use directly this equation to simulate the pressure loss into the motor without using the Darcy coefficients (alpha and beta), using a subroutine for instance ... The speed into the duct that is used is consequant (about 43 m.s-1) Thank you for your answer

 May 18, 2008, 09:20 Re: Simulation of pressure drop #2 Reza Guest   Posts: n/a Hi, Porous medium: StarCD needs to be fed with exactly alpha and beta coefficients. Details of the equation can be seen in the StarCD methodology. I used an experiment data and plotting it into a simple excel table. With 2nd order of polynome you can get the equation's alpha and beta. minimum 3 data point. If you don't have any experiment data, try to find a literature that describe this pressure drop and calculate the maximum pressure drop and like wise porosity. anyway....you are doing a steady simulation good luck,

 May 26, 2008, 07:02 Re: Simulation of pressure drop #3 Christophe Guest   Posts: n/a Hello That's exactly what I did to treat the problem. But my question was : is it really the only way to handle the problem ? Isn't it possoble to proceed otherwise than by the alpha and Beta coefficients ? Regards