[viv123]

Hi,

I am trying to simulate KH instability in openFOAM and FreeFem++. I am new to openFOAM but I have some background in FreeFem++.

I have following questions:
1) In FreeFem++, how can I use the 'movemesh' to perturb the interface?
2) In FreeFem++, should I define two different domains or should I write my equations using 'if-else' statements. In later case, how should I perturb the interface?
3) In openFOAM, I have no idea how to go about instabilities. Eventually, I want to study some instabilities in rotating fluids.

Basically, how should I go about solving instability problems in openFOAM as well as FreeFem++?

Any help would be appreciated. Thanks in advance!