jet oscillation at low inlet Re

wood

Hi There is a question. When a plane jet issued from a nozzle hits a bluff body downstream in a confined chamber, there are two big vortexes in front of the bluff body and two small ones behind it. A disturbance will cause the plane jet oscillate. When the velocity at the nozzle exit is high, which is proportional to the inlet Re number, the whole flow field in the chamber is turbulent. When the inlet Re is low enough, the whole flow field is laminar and no oscillation exists. Now, I am interested in when the oscillation begins. Now I am using a software based on FVM to simulate the oscillation at low inlet Re. I wonder: 1. if part of the flow field is turbulent and the rest is laminar, what kind of model should I use? Since a model such as turbulent and laminar is defined as a whole, can I still use them? 2. is FVM suitable?