there is no way to simulate the water at the bottom as a "free surface" of water
similarly there is no way to estimate the evaporation (phase change)
if your analysis is setup the way it should be, your best bet is to infer what may happen to the air based on temperature and pressure...etc.
Thank you Jared for your feedback.
Since I am only interested in the interaction of the air with the bottom surface which would determine whether the evaporation would take place or not,depending on the humidity of the air and temperature of the bottom surface. The shear stress plot at the bottom surface gives a good indication of the air-surface interaction,as shown below. However, i am trying to take the analysis to the next level by having some concrete evidence that the air is doing the job it is assumed to,i.e. drying the bottom surface.
As you've just mentioned, we cannot simulate water and there is no phase change etc. What condition do you recommend for the bottom surface which would help in determining the water condition there,any idea please ?
Can we do tracer study in such a case by having some concentration at the bottom and monitoring it over a steady state/ transient period ? If yes could you please guide me how?
Thank you again Jared.Much appreciated.