# reg:Pressure dependencies with velocities

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 April 25, 2007, 09:53 reg:Pressure dependencies with velocities #1 Palani Guest   Posts: n/a Hi ! I am doing 2d-flow past a cylinder (Unsteady-incompressible) Large Eddy simulations in fluent and try to capture the Pressure Fluctuations for 4 differnet velocities (dia,density, distance from the cylinder all are constant ) at a point located at the wake. In regarding this , I would like to validate my meshes on the basis of Pressure fluctuations captured at my reciever location. In connection with that, I need some theoritical relations between Pressure and Velocity (and Dia and Distance also accounts) In M.M.Zdravkovich , I have found that Average of the Fluctauting (P')2 is proportional to the fourth power of velocity. How can I fix a value of theoritical Pressure on the basis of Velocity???? Will be the following relation will be a valid one ... since my density is constant (P ')2 = (RHO)2 * (V)4 If not, Please reply me , if anybody knows some thoeritical stuffs....

 April 25, 2007, 11:15 Re: reg:Pressure dependencies with velocities #2 Mani Guest   Posts: n/a I don't see why you need a modeled relation between pressure fluctuation and velocity. Doesn't your CFD solution include both pressure and velocity? Why not get the pressure fluctuation (and/or velocity) directly from the unsteady flow field?

 April 25, 2007, 17:58 Re: reg:Pressure dependencies with velocities #3 Lam Guest   Posts: n/a You may use the energy equation that energy will always be constant. potential energy + pressure energy + kinetics energy = constant z + P/pho.g + v^0.5/2.g = constant if the z =constant, then the pressure is inverse proportional to the velocity.

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