# divSchemes in interfoam

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 March 29, 2013, 06:59 divSchemes in interfoam #1 Member   Join Date: Mar 2013 Posts: 96 Rep Power: 6 Hi to all, I'm new in the use of OpenFoam and i have two question about the scheme used in interfoam. 1)why only the divergence is discretized with a TVD scheme? 2)why the DamBreak tutorials choose two different limiter function for div(rho*phi,U) e div(phi,alpha) ? thank to all

April 1, 2013, 11:15
#2
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Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
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Hi Giack, my humble contribution,

Quote:
 Originally Posted by giack Hi to all, 1)why only the divergence is discretized with a TVD scheme?
Since in temporal and laplacian schemes the linear interpolation is enough stable and accurate (2nd order). The necessity of TVD schemes appears due to the advection.

Quote:
 Originally Posted by giack 2)why the DamBreak tutorials choose two different limiter function for div(rho*phi,U) e div(phi,alpha) ?
Each div term is different in general. For example you could have a flow where the velocity is almost a fixed field, so that, you could even use the linear scheme, meanwhile the void fraction is changing and stabilization is required, then a TVD scheme is needed.

Regards.
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 April 2, 2013, 04:00 #3 Member   Join Date: Mar 2013 Posts: 96 Rep Power: 6 it's all clear,thank you very much for your explanation

 Tags divscheme, interfoam, limitedlinear, tvd, vanleer

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