Is there any way not to use the AMG solver?

- March 29, 2021 at 4:53 pm
  
  ibopaul
  Subscriber
  
  Hello! I'm trying to compare the performance of AMG solver.nI found turn off the AMG solver by setting Max Coarse Levels to '0'.nHowever, after I turn of the AMG solver, which linear equation solver I use?nstill, after i turn off the AMG, there are pre relaxation and post relaxation blanks and inner cycle blanks. Also there only two smoother types (ILU, Symmetry Gauss-Seidel). nIf I turn off the AMG, AMG-related blanks (pre-relaxation, post relaxation & inner cycle) are just ignored?nIs there any way to use one Gauss-Seidel iteration method on flow solver? (to compare AMG acceleration performance)nMy simulation is steady & density based.nnThank you.n
- March 30, 2021 at 4:39 am
  
  YasserSelima
  Subscriber
  
  From the theory guidennn
- March 30, 2021 at 5:31 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  Why?n
- March 30, 2021 at 6:32 am
  
  ibopaul
  Subscriber
  
  I wanted to know the speed difference as to whether or not to use AMG.nIs it impossible to compare the calculation speed?nThank you.n
- March 30, 2021 at 8:30 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  With AMG you will always have quicker runs. It is practically impossible to have reasonable run times without using Multigrid Methods. n