|May 7, 2014, 04:23||
buoyantBoussinesqPimple p_rgh BOUNDARY CONDITIONS
Join Date: Feb 2014
Posts: 4Rep Power: 4
i'm trying to set a simple simulation with buoyantBuossinesqPimpleFoam, but i have a problem with the BC, especially with p_rgh and p. As far as i have understood for the p i have to set calculated since it is obtained as p=p_rgh+rhok*gh . The case is the following : a rectangular 2D column domain vertically oriented,with later impermeable walls, filled by water a T1 temperature. From below i inject at a constant rate water at a greater temperature T2.
Now for the BC at the bottom i will set
p_rgh-> ?? which is better?? zeroGradient is it possible or not for this variable??
at the Top
p_rgh-> ?? which is better?? fixedValue uniform=0 since it is in atmosphere?? is it possible??
it is convenient to set the z coordinate at the top of my domain so i get p_rgh=p+0 ?? and setting p_rgh=0 as BC i will not have additional problems??
at the lateral wall i set
p_rgh-> zeroGradient it is ok??
Another question is about the meaning of the last step in the PIMPLE algorithm
p = p_rgh + rhok*gh;
p += dimensionedScalar
pRefValue - getRefCellValue(p, pRefCell)
p_rgh = p - rhok*gh;
where i specify the needReference() option?? and also the pRefValue and pRefCell?? I have to specify them or not??
Thanks so much to everybody!!
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