Settings of Equations Solved using GPU
 

I was trying to use GPU for solving pressure, x-mom and y-mom equation. But I do not understand the parameters asked to be tuned by FLUENT.
I need help to understand
>Termination criterion,
>Solver,
>Max Number of cycles,
>Coarsen by size,
>pre-sweeps,
>post-sweeps and
>smoother
What do they mean and what should be their default values?

Console is pasted here for ref:

> solve/set/amg-options/amg-gpgpu-options

/solve/set/amg-options/amg-gpgpu-options>
pressure x-mom y-mom

/solve/set/amg-options/amg-gpgpu-options> pressure
Enable on GPGPU? [no] y
Termination criterion [0.1]
Solver (FGMRES PBICGSTAB AMG) ["FGMRES"]
Max number of cycles [20]
Coarsen by size [2]
Pre sweeps [1]
Post sweeps [1]
Smoother (ILU GS JACOBI) ["JACOBI"]

These are the settings for the multigrid solver itself. It is not GPU specific, even in regular cpu solver, the AMG has the same parameters. You probably don't need to tune any of them. Better yet, if you don't know what each of these are, don't touch them! Leave them alone! The defaults are fine. If you understand what the AMG solver is/does, the names of these parameters are quite obvious / well-correlated. If you have to ask, then don't touch!


If you want to see what these do, don't play with it in GPU-land. Play with it in CPU-land.