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April 25, 2007, 10:53 |
reg:Pressure dependencies with velocities
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#1 |
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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.... |
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April 25, 2007, 12:15 |
Re: reg:Pressure dependencies with velocities
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#2 |
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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?
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April 25, 2007, 18:58 |
Re: reg:Pressure dependencies with velocities
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#3 |
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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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