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divSchemes in interfoam

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Old   March 29, 2013, 06:59
Default divSchemes in interfoam
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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) ?

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Old   April 1, 2013, 11:15
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Hi Giack, my humble contribution,

Quote:
Originally Posted by giack View Post
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.

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Originally Posted by giack View Post
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.


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Old   April 2, 2013, 04:00
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it's all clear,thank you very much for your explanation
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divscheme, interfoam, limitedlinear, tvd, vanleer

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