Hi all,

I am trying to simulate combustion in a one-side closed tube. The tube is initially filled with a premixed miture of fuel and air. Once ignited, a wave propagates from the closed end towards the open end. This wave is supposed to travel at Mach number greater than 3 inside the tube. I am trying to simulate the problem in FLUENT using Finite Rate volumetric reaction with standard K-Epsilon model and the interaction between chemistry and turbulence as the Eddy Dissipation model. I am able to see the wave travelling at Mach =0.69 but not more than that.

Can someone think of reasons as to why the velocity of the flame front is not increasing to mimic the actual physics?

Try the coupled-explicit solver with dynamic mesh adaption to get resolution at the shock front. Use laminar chemistry, and start with turbulence off.

Okay I will try that. Thank you for your response cg.

[CPT]

Hi All,

I am trying to perform a 2-D simulation on a Scramjet Combustor and I guess the back pressure increase due to combustion is getting so high that its pushing out the oblique shock wave out of the combustor. If I decrease the back flow pressure will that solve my problem ?

Thanks,
CPT