probleme with mass conservation

hi, every one

My problem is a two-dimensional double diffusion problemin square cavity. there is a temperature difference and a concentration difference between vertical walls, and the horizontal wall is adiabatic and impermeable.

i tried to simulate my problem:

- i checked the report flux for the total mass rate i`am surprised because it displayed zero on vertical walls while i imposed mass fraction !!!

i calculated the sherwood number for the right and left walls and i didn`t had a conservation

for the mixture i used(air+h2o vapor) with imposed physical properties

thanks

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