Keyur Kanade
Ansys Employee

For time step, you can calculate ((Vcell_min)1/3)/vel


Please set time step less than this value. 


You can always get min cell volume when you check the mesh in Fluent. 


And yes, the you are using correction option for patching. 


Once patched, please cross check volume fraction contours and then only proceed with iterations. 


Regards,


Keyur