[s.chen8]

Hello all,

I met some unexpected situation while doing some IC engine cycle simulation. Remaining all the setup unchanged(including embedding strategies, combustin model, emission model, etc,.) and change the base grid size only, everything went smooth when I switch from 4mm, 3mm and 2mm. The final outputs were linear ly converging and the difference getting smaller.

However, while I tried 1.5mm as base grid size, the output was diverged and showing some different trends. The engine is a common 1.5L NA gasoline inline-4 engine, 73mm bore, running at 3000rpm WOT, 23.77% EGR with stoichimetric condition. I was using 58 threads (29 cores), 3.3 GHz.

My question is: Does it happen before while changing base grid size? OR Does it relate with computer multi-core capability? Or does it relate with AMR distribution while changing base grid size?

Thank you!