[miguel.soto]

Hi everybody,

I´m triying to perform a conjugate heat transfer simulation, where a solid zone is modeled as an energy source, cooled by an air stream. The goal is to get the temperature distribution both at the solid and fluid zones.

I´ve realized that convergence of the energy residuals is too slow, likely due to the difference between thermal conductivity coefficients for air and aluminium.

I tried to start iterations disabling energy equation and then after the flow and turbulence are well converged, to enable the energy equation, but still facing problems due to the fact that when i set high under-relaxation factors for the energy, the solution starts to diverge.

CFX includes an option well known by its user´s called "solid time scale factor" , that allows to set different time steps for solid and fluid zone, thus improving energy solution convergence.

Does anybody knows if fluent includes an option similar to CFX "time scale factor?

Best Regards

Miguel