Thanks a lot!! The flame cover about 4 cells on a total of 400 in main direction. I used a finer grid as you suggested and the situation improved. Unfortunatelly after certain time I see spurious noise in my velocity field (i should simulate laminar premixed combustion but these instabilities...
My problem is that I dont conserve mass in my domain and I get strange wiggles in velocity profile.
I use finite volume with AB2 and FFT solver for nabla²p.
I have a laminar flame starting at the centre of a box with periodic BC in y and z direction. I have to work on x direction BCs to achieve...
