# buoyantPimpleFoam's equations.

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 June 30, 2015, 11:53 buoyantPimpleFoam's equations. #1 Senior Member   Dongyue Li Join Date: Jun 2012 Location: Torino, Italy Posts: 757 Rep Power: 10 Hello guys, Right now Im working on buoyant driven force flow. I have a miner confusion about the equations implemented in buoyantPimpleFoam. We know that: rho1 = rho0 + psi*(p1-p0) = rho0 + psi*(p_rgh1 - p_rgh0 + rho1 g h - rho0 g h) // neglected? But in the code, it is: rho1 = rho0 + psi*(p_rgh1 - p_rgh0) Code: ```fvScalarMatrix p_rghDDtEqn ( fvc::ddt(rho) + psi*correction(fvm::ddt(p_rgh)) + fvc::div(phiHbyA) == fvOptions(psi, p_rgh, rho.name()) );``` Anybody knows the reason of neglecting the last two terms? Thanks Update： Its neglected. more info: http://www.openfoam.org/mantisbt/view.php?id=1772#c5033 __________________ Im the translator of OpenFOAM User Guide Chinese Edition! But always newbie on CFD. http://dyfluid.com/en.html Last edited by sharonyue; July 2, 2015 at 10:42.

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