When initializing turbulent flow for VOF calculation, solver get me this error:

"Warning: Initializing turbulent flow with density unavailable in fluid! Density of 1 kg/m^3 assumed for computing initial turbulence quantities."

What is it?? How can I avoid this error??

Thank a lot

There's no problem, simply the turbulent flow field will be initialized using a standard density value. Next the turbulent flow will be calculated coerently with the exact density of the fluid...
It's just the initialization

...ok, but after a few iteration simulation diverge and the iso-surface at VOF=0.5 assume unphysical shape....

With laminar model I don't have this problem!

Any idea??

what kind of simulation is? Steady, transient...and also: underelax, boundary, initialization field/functions...?

Simulation is VOF unsteady, underelax low (0.4, 0.3 etc..), wov wave first order, 6DOF frozen for computing hyrodynamics forces on a ship hull.

Similarly of the demo from CD-Adapco for DFBI, i set the correct bondary conditions, but i change turbulent model...so from laminar to k-omega. Mesh is ok, with B.L.y+=50.

Time step 0.01s

Do you have any experience on this problem?

Are you using first or second order time Discretization?

second order

and first order for time!

Try changing the turbulence specification to K + Epsilon on both the initialization and the inlet.

if it doesn't work try initializing the sim with first order scheme...then switch to second order later
It's a general tip, I'm sorry but I don't have experience in this kind of sim...but the initialization it's similar to other ones...

Have you tried lowering the time step? Are you using ccm+ or v4? In v3 I always faced problem when the time step is that large (0.01s). In v4 this seems less a problem. I think I read on the manual or somewhere VOF is not yet able with k-omega or other turbulence models. For DFBI, it might not even able to handle k-E but I'm not sure. BTW, I'm curious to know how long it takes you to complete this run.. the elapsed time I mean... when you complete this job later. (Just curious if you dont mind).

I think VOF and turbulence don't go together in STAR-CD. The software calculates granular variables and the only correct choice there is laminar flow.