Mass conservation law violation in stationary case

vitmalin

Dear colleagues,

I have got very surprising result trying to simulate air ideal gas heating process in closed volume (stationary case). The matter is that instead of expected pressure rise due to ideal gas heating Fluent decreases ideal gas density! From my point of view in accordance with mass conservation law in closed system the air ideal gas density = mass/volume is constant!

Problem setup: closed volume with wall at 450K. Initial conditions: 300K and relative pressure = 0 Pa. Reference pressure = 1e5 Pa. Simulation type: Stationary.

P.S. The same model in transient case provides physically adequate result: final pressure = 1.5e5 Pa.

Could anyone advise me something to fix this problem?

Best Regards, Vitmalin