[jhaworth10]

HI guys, I'm new to this site so I'm going to try my best in describing the problem I have been having over the past week. I am trying to model a mixing process in a pre chamber that is being used in an IC engine. I am currently in college and have little experience with fluent so I am having problems such as reversal flow and unrealistic velocities being spit out during the time steps. For the mixing process, I am setting 2 bottom inlets as pressure inlets. These are ran by a UDF that I created to simulate the dynamic pressure curve of the engine. The top inlet is the injector that is ran off of a udf as well, but as a velocity inlet. The reason for using a udf at the top was due to the fact that the injector must shut off at around 30 degrees BDC. I understand that the flow is going to be compressible and turbulent, but I am unsure how to set it up without blowing up on me. I am using a K epsilon standard wall model, transient density based solver, and a species transport with a methane-air mixture. If you have any experience with modeling a pre chamber and are willing to give me some advice, I would greatly appreciate it as this project is at a standstill until I can figure out how to calm the solution's velocities down and get a realistic solution.

Thanks

Jim