[tmy]

Hi all,

I have a simple geometry similar to a cylindrical engine shape, with the left piston-like boundary moving toward right direction. N2 is the only species. However, when I run the simulation, the time step size is limited by turbulence iteration? My geometry size is about 0.39*0.05*0.05, and I tried both coarse and refined mesh. For coarse mesh, dx*dy*dz=0.04*0.0125*0.0125, with total cell number around 250; For refined mesh, dx*dy*dz=0.015*0.01*0.01, with cell number around 1000; The time step size for coarse case is dt=3e-9s, and for refined case it's 5e-11s. Attached is the "turbulence.in" I used and "a.log" CONVERGE generated. I am wondering if there are any problems in the turbulence model I set up.

Thanks for any help or suggestions from you!