Rob
Ansys Employee

Simulation is a part putting stuff into geometry, mesh and solver and part judgement on what needs to go in. 

So, if you include the baffle as a volume. Currently with one cell across the thin edge/face do you think you're resolving the flow? What aspect ratio will you get (hex) and skew (tet) if you aim for the mesh above? How many volume cells would you need to put 3 cells across the face with an acceptable quality? 

Or, if we assume the baffle is "thin" ie has no physical thickness what would that do to the flow that's different to including it as a solid/volume?