Reply To: Fluent solution slowing down : 2-way FSI

[Rahul]

The solution might slow down with more number of cores. With increasing processors, the mesh and data will be partitioned and each core do its part of the work and interchange info (the compute node does this). So if the number of processors is high, communication time for the CPU will be more than analysis time which is not effective. Try using fewer cores for Fluent (10-15) as you have about 1M cells. 

If it is Linux machine try clearing Linux File Cache buffers, you can include the -cflush option when launching Ansys Fluent from the command line to flush the cache buffers.