Temperature calculation problems
 

Hello everybody! I'm trying to compute the temperature field for the opposite jets model (gaseous fuel [n-heptane] vs. oxidizer [air]. The flow is laminar and incompressible, no chemical scheme associated). When I apply the Static Enthalpy option for the Conservation and the Chemico-Thermal option for the Enthalpy in the AIR themperature calculation, the obtained temperature values are too high and the solution is very unstable. However, applying the Thermal option for the Enthalpy yields bad convergence (the enthalpy residual ~0.02), but constant temperature field, which seems to be true. Have some idea how to explain this? Please, try to if you do. Is it possible that the chemical reaction still takes place in the computations?

Thank you in advance, Julie

Re: Temperature calculation problems
 

I hear you on this as I have had similar issues. I assume you also had MARS on with this. I have had many examples where I have tried to use the chemico formulation of the enthalpy equation with MARS and the solution would diverge. To counteract this, I am forced to use the UD scheme of the temperature equation.

If you are not running MARS, contact adapco.