We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum Forums Discuss Simulation Fluids Energy conservation/balance in mixture multiphase Reply To: Energy conservation/balance in mixture multiphase

Amir
Subscriber

I repeated this simulation with different conditions. This time all fluid zones had same initial temperature and RH, soil and pipe also had same initial temperature:

1-Dry Air and no Condensation/Evaporation; Total energy and total enthalpy were conserved and energy gained by cold zone was equal to the energy lost by hot zone.

2- Humid Air with Condensation; Total energy and total enthalpy were NOT conserved, BUT both of them changed by the exact same amount (-7e+08J for one case). Energy gained by cold zone was NOT equal to the energy lost by hot zone.

I used mixture multiphase model with Lee Evaporation/condensation and a piecewise-linear profile for saturation temperature of vapor. Could that be causing these discrepencies?

I am trying to repeat the simulation with UDF for saturation temperature, but in the meanwhile I would appreciate experts' comments on this.