Hi all,

I've added an equation of state and a chemical reaction to the compressible flow solver via couple of FORTRAN subroutines. In my 2D simulations, everything is cool and I've almost linear scalability up to 2K processors. However, my 3D simulations are surprisingly slow. Do you have any idea about probable reasons? 

What I basically do for the chemical reaction is: I call a FORTRAN subroutine in DoOdeRhs to get the required forcing terms for energy and species equations.