[Andrea1984]

Hi all,

I am running a transient simulation of a gas turbine combustion with using the Reynolds Stress Model for turbulence and the partially premixed model for combustion.

I am aware that the RSM model can be difficult to converge, however I can obtain a converged solution using the first order discretization with the transient solver.

The problem is that when I switch to the second order discretization my solution diverges after few time steps; my URFs are already quite low so what am I supposed to do now? Do I have to reduce the time step? Is it a correct practice to reduce the time step when switching from 1st order to 2nd order discretization?

Many thanks

Andrea