Droplet breakup in interDyMFoam - escalation of Courant number
 

Hello,

I am modeling a droplet breakup from the surface of a nozzle (flat surface with inlet channel of some flow rate) - What I am interested to know is the mean time between the breakup of two droplets

I am using an OpenFOAM version for Windows 17.06

The solver is interDyMFoam with dynamic mesh refinement on Alpha field - I used SALOME to make a simple mesh (tets) with local refinement on the inlet nozzle. I know approximately that the breakup radius is ~2.3 mm from the surface, I made intial alpha field of 2.2 mm radius to reduce the time it takes to build up this droplet, then I want to see it getting detached from the surface.

I uploaded the case to google drive

https://drive.google.com/file/d/0B4f...ew?usp=sharing

The problem I have is: when the interface is going to breakup the Courant number jumps very high - if I fixed delta t, if I let it adjustable, it keeps getting smaller and very smaller, what could be the wrong with my model, I am even using the correct solver?Could it be related to the boundary conditions? I would appreciate if someone looks to my 0 directory or the fvScheme ...