# simpleFoam vs buoyantSimpleFoam

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 February 3, 2014, 12:13 simpleFoam vs buoyantSimpleFoam #1 New Member   jhonny Join Date: Oct 2013 Posts: 3 Rep Power: 5 Dear Foamers, I am quite new to use OF to solve external aerodynamics. I am writing here to ask for your kind help. I try to simulate a cube placed on the ground on a face in order to understand how OF manage the force calculation with simpleFoam and with buoyantSimpleFoam. The point is that I should get the same value of forces on the cube, but something is wrong... I tried to compare the data in the postProcessing/forces folder with the value obtained by the integral of pressure on the cube's surfaces in paraFoam but i cant get the point. Maybe I make some mistakes: to integrate pressure on faces I generate surface normals on the cube and the integrate the calculated variable p*normals. The topics are these: 1. there is any differences on forceCalculation between simple and buoyant? 2. why the intergals of (p*normals) do not match with the force calculation of postProcessing folder? I'd like to thank anyone could help me... Here below there some values: /*___with simpleFoam___*/ P pressure 0; dimensions [0 2 -2 0 0 0 0]; --> after 50k iter forces(pressure, viscous, porous) (-1.677823966 -0.04192667675 0.8973219913) only pressure while with the integrateVariable on P 1.47393 -0.0309424 -0.895828 /*___withbuoyantSimpleFoam____*/ P pressure 101325; dimensions [1 -1 -2 0 0 0 0]; P_RGH pressure 100000; dimensions [1 -1 -2 0 0 0 0]; --> after 50k iter forces(pressure, viscous, porous) (-3.544135454 -0.2622319888 -24650.00027) only pressure while with the integrateVariable on P_rgh 193.717 421.979 26073.8 while with the integrateVariable on P 193.71 421.967 26072.3

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