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  3. A closed domain initialized with air, density as ideal gas law, zero static pressure, & 300 K temperature. I have defined constant energy source so as to increase air temperature, Now I want to observe rise in static pressure with temperature change. But while simulating I observe change in density & obviously in mass in closed domain instead of pressure rise. How can mass of air changes for a closed domain without any outlet?

A closed domain initialized with air, density as ideal gas law, zero static pressure, & 300 K temperature. I have defined constant energy source so as to increase air temperature, Now I want to observe rise in static pressure with temperature change. But while simulating I observe change in density & obviously in mass in closed domain instead of pressure rise. How can mass of air changes for a closed domain without any outlet?

Tagged: fluent, fluid-dynamics, General, General - FLUENT
    • January 25, 2023 at 7:16 am
      FAQFAQ
      Participant

      The pressure based solvers are generally segregated solvers (SIMPLE/PISO/etc). If you solve only the energy equation, the momentum equation is skipped. Because of the pressure-velocity coupling, the pressure is updated during the momentum equation (i.e. the flow equations). If you do not enable the flow equations, pressure will be fixed but temperature, density, and other material properties can still be updated. Hence with pressure fixed and increasing temperature, your density decreased because of the ideal gas law.

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