# Heating Air/Liquid Cavity 2d-Transient

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 January 17, 2023, 17:40 Heating Air/Liquid Cavity 2d-Transient #1 New Member   Tarık Yaman Join Date: Dec 2021 Location: Turkey Posts: 9 Rep Power: 4 Greetings, I am interested in gas heating in closed and constant volume region. But I have some thoughts, I want to share them with you and get advice. Its volume is constant, if I heat any gas (example: air), its density does not change. Therefore, my material is of constant density. When a constant volume of gas is heated, its pressure will increase. From the ideal gas behavior I get the following relation: P_1/T_1 = P_2/T_2 At the same time, an increase in viscosity will occur due to the increase in pressure. **I should use C_v instead of C_p because in my analysis the volume is constant, not the pressure. I want to adjust these values ​​according to temperature and pressure in Fluent, I think I need to work hard to find these values. Since pressure increases proportionally with temperature, I actually have to write them all as a function of temperature. I have to open the thermodynamics book. Or am I thinking of too many details? Is there a method that will lead us to similar results with a little error? About this subject; Do you suggest any adjustments in material settings, solution methods, controls? Thank you in advance for your help and feedback.

 Tags cavity problem, natural convection, transient