Urgent please, help with an atomization model
 

Hi Im doing this for an important college project and as im not an expert in Fluent so im having some troubles, i have 3 meshes for a external mixing air-assist nozzle, one mesh for the liquid orifice, one mesh for the gas orifice and one mesh for the mixing zone. I want to simulate the atomization process.of gas nitrogen and liquid acetone. Can anyone guide me through this process and tell me if there are other BC needed in addition to the gas and the liquid inputs and the outflow faces. Any help is welcome . Thanks