need some suggestion

nabeel

hi i am finding heat transfer coffecient for coolant in channels of combustion chamber .the goal of my simulation is to calculate heat transfer coeffecient through species transport.i am using segregated solver and no diffusion b/c of species transport through convection. i am using mass flow inlet and pressure outlet and wall BC.

my fluid is only liquid how i off mixture template. second my solution is not converging what should i do.i tried after reducing relaxation factor . my residuals have oscillation pattern after 200 iteration. nabeel