[Saideep]

Hi everyone;

This is my first post on global CFD-online platform. I am presently working with OpenFOAM's Volume of Fluid (VoF) method but struggling with spurious currents. This makes me search for other methods that could alleviate spurious currents.

I found some research on coupled Level-set(LS) with VoF. LS is new to me so I would appreciate some help on coupling of LS with VOF.

I recently came across the following paper:
http://www.ann.jussieu.fr/~frey/pape...%20methods.pdf

I have many questions and problems in implementing the same in OpenFOAM because OpenFOAM does not use a PLIC reconstruction methods.

Questions:
1. I see that in many related papers, advection of VOF function and LS function are done. As VOF is mass conservative, we build LS function from VOF function. So, why do we need to advect LS function? It is finally being reconstructed from mass conservative VOF function.

2. Defining the VOF function.
In later steps after constructing LS function, for next time step advection, we construct VOF function from LS function. Sussman et.al mentions getting value from Heaviside function as follows:

In VOF, interface is defined when indicator function is between 0 and 1 but here there are only two possibilities. 0 and 1 which represent two fluids without an interface in any case. (of course theoretically speaking, interface is present between cells with value 0 and 1, but no intermediate values).
LSEq.png
Excuse me if I got something wrong with Level Set method, I am trying to understand how things work.

Thanks;
Saideep

[valgrinda]

When using PLIC, the interface normal vector is needed for the reconstruction of the interface. With the level set function, this vector can be determined much more reliably and in a straightforward fashion. Have a look at this paper:

doi:10.1016/j.ijmultiphaseflow.2008.11.004
http://www.sciencedirect.com/science...01932208001833

Hans

[Fanfei]

Hi saideep
I found the code in Openfoam about level set method coupled VOF have been resealsed. And I want to know whether you have already finish that job?

Best regards
fan Fei