[giack]

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

[santiagomarquezd]

Hi Giack, my humble contribution,

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.

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.

[giack]

it's all clear,thank you very much for your explanation