Hi. Does anybody have any experience with the Launder & Sharma low Re number turbulence model, in conjunction with combustion (nonpremixed) modelling (using the SCRS/pdf approach). I find that soon after 'switching on' the combustion model, the simulation crashes due to a zero in a denominator somewhere. Very small under-relaxation factors and numerous sweeps of the continuity equation do not seem to help. The combustion algorithm is correctly implemented because the simulation works properly when using the standard k-e model.

Any suggestions would be greatly appreciated. Thanks,

Richard

Dear Richard

Perhaps you could check the value of the variable. Ex turbulence reynold number, y+ value, turbulence viscosity, the turbulence kinetic energy and turbulece dissipation and the corresponding coefficients value first.