Tutorial Doubt
 

Its simple doubt..

I was solving one tutorial on natural convection provided by fluent. Its a rectangular pool (2D) filled with water. Upper and lower edge are adiabatic. Right edge is kept on 1000K and 2000K. I solved just as fluent asked me to do.

Problem is i cannot understand one phenomena. I checked the pressure contour and find the pressure at top is maximum and at bottom of rectangular pool, pressure is minimum.. How that can be possible? According to me if pressure at top is 1 atm, pressure at bottom surface should be 1+(rho*g*h)..

Where i am getting wrong ??