Configuration for Preconditioner

pmm.cfg

[blockns]                                                                                                                                                                         
cd=true                                                                                                                                                                           
pcd=true                                                                                                                                                                          
                                                                                                                                                                                  
[blockns.pmm]                                                                                                                                                                     
# consider diagonal pressure mass matrix                                                                                                                                          
diag=0                                                                                                                                                                            
        
# pressure mass matrix                                                                                                                                                            
[Mp]                                                                                                                                                                              
reuse-prec=true                                                                                                                                                                   
pc-type=gamg                                                                                                                                                                      
ksp-monitor=1                                                                                                                                                                     
pc-gamg-type=agg                                                                                                                                                                  
pc-gamg-agg-nsmooths=1                                                                                                                                                            
pc-gamg-threshold=0 #1e-4                                                                                                                                                         
pc-gamg-set-sym-graph=true                                                                                                                                                        
ksp-rtol=1e-6                                                                                                                                                                     
ksp-maxit=300                                                                                                                                                                                          
                                                                                                                                                                                  
# velocity convection diffusion operator                                                                                                                                          
[Fu]                                                                                                                                                                              
reuse-prec=true                                                                                                                                                                   
pc-type=fieldsplit                                                                                                                                                                
ksp-rtol=1e-9                                                                                                                                                                     
ksp-monitor=1                                                                                                                                                                     
fieldsplit-use-components=1                                                                                                                                                       
fieldsplit-type=additive                                                                                                                                                          
                                                                                                                                                                                  
[Fu.fieldsplit-0]                                                                                                                                                                 
pc-type=gamg#lu                                                                                                                                                                   
ksp-type=preonly                                                                                                                                                                  
pc-gamg-type=agg                                                                                                                                                                  
pc-gamg-agg-nsmooths=1                                                                                                                                                            
pc-gamg-threshold=1e-4                                                                                                                                                            
pc-gamg-set-sym-graph=false                                                                                                                                                       
ksp-rtol=1e-9                                                                                                                                                                     
reuse-prec=true                                                                                                                                                                   
                                                                                                                                                                                  
[Fu.fieldsplit-1]                                                                                                                                                                 
pc-type=gamg#lu                                                                                                                                                                   
ksp-type=preonly                                                                                                                                                                  
pc-gamg-type=agg                                                                                                                                                                  
pc-gamg-agg-nsmooths=1                                                                                                                                                            
pc-gamg-threshold=1e-4                                                                                                                                                            
pc-gamg-set-sym-graph=false                                                                                                                                                       
ksp-rtol=1e-9                                                                                                                                                                     
reuse-prec=true                                                                                                                                                                   
                                                                                                                                                                                  
[Fu.fieldsplit-2]                                                                                                                                                                 
pc-type=gamg#lu                                                                                                                                                                   
ksp-type=preonly                                                                                                                                                                  
pc-gamg-type=agg                                                                                                                                                                  
pc-gamg-agg-nsmooths=1  
pc-gamg-threshold=1e-4                                                                                                                                                            
pc-gamg-set-sym-graph=false                                                                                                                                                       
ksp-rtol=1e-9                                                                                                                                                                     
reuse-prec=true                                                                                                                                                                   
                                                                                                                                                                                  
[Fu.fieldsplit-1]                                                                                                                                                                 
pc-type=gamg#lu                                                                                                                                                                   
ksp-type=preonly                                                                                                                                                                  
pc-gamg-type=agg                                                                                                                                                                  
pc-gamg-agg-nsmooths=1                                                                                                                                                            
pc-gamg-threshold=1e-4                                                                                                                                                            
pc-gamg-set-sym-graph=false                                                                                                                                                       
ksp-rtol=1e-9                                                                                                                                                                     
reuse-prec=true                                                                                                                                                                   
                                                                                                                                                                                  
[Fu.fieldsplit-2]                                                                                                                                                                 
pc-type=gamg#lu                                                                                                                                                                   
ksp-type=preonly                                                                                                                                                                  
pc-gamg-type=agg                                                                                                                                                                  
pc-gamg-agg-nsmooths=1                                                                                                                                                            
pc-gamg-threshold=1e-4                                                                                                                                                            
pc-gamg-set-sym-graph=false                                                                                                                                                       
ksp-rtol=1e-9                                                                                                                                                                     
reuse-prec=true                                                                                                                                                                   
                                                                                                                                                                                  
                                                                                                                                                                                  
[stokes]                                                                                                                                                                          
preconditioner=PCD#petsc#PMM                                                                                                                                                      
ksp-rtol=1e-6#1e-10                                                                                                                                                               
ksp-monitor=1                                                                                                                                                                     
ksp-type=gcr                                                                                                                                                                      
ksp-use-initial-guess-nonzero=false                                                                                                                                               
gcr-restart=100                                                                                                                                                                   
                                                                                                                                                                                  
[gmsh]                                                                                                                                                                            
hsize=0.1                                                                                                                                                                         
filename=$top_srcdir/data/gmsh/steps/step-elmann-2009.geo                                                                                                                         
geo-variables-list=L=5:dim=3