Hi Thummala,

See this literature:

https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjeuMPam5HWAhUIL1AKHc0ECu8QFggrMAE&url=https%3A%2F%2Fpublikationen.bibliothek.kit.edu%2F1000065827%2F4040792&usg=AFQjCNEN3E5BTe8xrD7BX6btH_S9u3xowA

Vimal Patel

Thank you Vimal . I will go through this thesis :)

Hi,

IsoAdvector (Article A Computational Method for Sharp Interface Advection

Thank you Matthias,

I will give a try with this algorithm

I agree with Matthias Rauter, also use fine meshes!

The recently introduced schemes in the OpenFOAM 8 work great for me:

interface diffusion is removed, see attached figures.

BTW these new schemes are:

(a) improved robust and bounded compression scheme

div(phi,alpha) Gauss interfaceCompression vanLeer 1;

(b) piecewise-linear interface calculation (PLIC), which cuts the surface to match the volume fraction:

div(phi,alpha) Gauss PLIC interfaceCompression vanLeer 1;

(c) a multicut PLIC version MPLIC, which produces further required cell splits:

div(phi,alpha) Gauss MPLIC;

Matthias Rauter mentioned isoAdvector. I use it for complex bubble flows and it gives the best results by far. The isoAdvector that is included in the openoam.com version, as well as the original github repo, at the time of writing this, is a bit behind the most recent developments. The latest version is available here:

https://github.com/DLR-RY/TwoPhaseFlow

where there are more advanced surface tension and interface reconstruction schemes.

Of course there are some cases where there are some unexpected effects:

https://develop.openfoam.com/Development/openfoam/-/issues/2052

but from my experience, it is consistently better than MULES, for modelling immiscible fluids.