Hi CFD users,

I am running a 3D simulation of a centrifugal pump in Fluent 6.2.16. First i used the MRF method and all the cases were simulated in a single machine. There were no convergence problems.

Recently we made a network cluster of four machines. The OS is Linux SUSE 10. I am novice in parallel simulations. I am running the previous simulations with SM method using the MRF as an initial solution in parallel mode. I partition the grid in a serial solver and then I read the cas/dat in the parallel solver.

Here is the strange: When I group all the interfaces in a single partition by activating the "encapsulated grid interface " in Partition panel (This is recommended by Fluent manual for non-conformal meshes), my solution is diverged in the parallel solver. When de-activate the "encapsulated grid interface" my solution converges!!! Can anyone know why this happens? Isn't it strange? Thank you in advance,

Yes, this may happen, because the encapsulation is causing very long partition interfaces, which is very bad for convergence.