Hi, I'm currently doing a simulation where I need to analyze the properties of a water-ethanol mixture in closed a cavity with given boundary conditions.

For the cavity I have taken a 2-D surface geometry and set it to fluid. I'm confused as which solver model I should use. Also it would be helpful if anyone can tell me how to plot the concentration of the mixture after the calculations are done as I need to determine the concentration at the mid-section of the cavity. Thanks in advance.