Iteration Problem
 

I am simulating an unsteady 3D transient diesel engine combustion process using Fluent 14.0 installed in windows 7 64-bit system.

I run the simulations using 3 different injection files which are A, B and C. However, after running 548 time-steps and 100 iterations per time-step, simulation A and B works well.

Unfortunately, for simulation C, it stopped in the middle of simulation. It stated there "calculating solution" but it never move or calculate further even after 1 or 2 hours. I re-run the same injection file C using 32-bit windows 7 and it works fantastically.

Can I know what's going wrong? Any problem or error with this? I attached the picture as below for reference.

Thank you. :)