[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-15 Thread Jed Brown
On Wed, Jun 15, 2011 at 02:53, Barry Smith wrote: > It seems we should provide a DMSDA that is built specifically for > staggered grids, with the correct number of "slots" in the correct > "locations", it would have appropriate grid hierarchies and > interpolation/restriction. Not terribly hard

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-15 Thread Matthew Knepley
On Wed, Jun 15, 2011 at 1:47 AM, Barry Smith wrote: > > On Jun 14, 2011, at 8:45 PM, Matthew Knepley wrote: > > > On Wed, Jun 15, 2011 at 1:42 AM, Barry Smith wrote: > > > > On Jun 14, 2011, at 8:36 PM, Matthew Knepley wrote: > > > > > On Wed, Jun 15, 2011 at 1:20 AM, Barry Smith > wrote: > > >

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-15 Thread Matthew Knepley
On Wed, Jun 15, 2011 at 1:42 AM, Barry Smith wrote: > > On Jun 14, 2011, at 8:36 PM, Matthew Knepley wrote: > > > On Wed, Jun 15, 2011 at 1:20 AM, Barry Smith wrote: > > > > On Jun 14, 2011, at 7:59 PM, Jed Brown wrote: > > > > > On Wed, Jun 15, 2011 at 02:53, Barry Smith wrote: > > > It seems

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-15 Thread Matthew Knepley
On Wed, Jun 15, 2011 at 1:20 AM, Barry Smith wrote: > > On Jun 14, 2011, at 7:59 PM, Jed Brown wrote: > > > On Wed, Jun 15, 2011 at 02:53, Barry Smith wrote: > > It seems we should provide a DMSDA that is built specifically for > staggered grids, with the correct number of "slots" in the correc

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-14 Thread Barry Smith
On Jun 14, 2011, at 8:45 PM, Matthew Knepley wrote: > On Wed, Jun 15, 2011 at 1:42 AM, Barry Smith wrote: > > On Jun 14, 2011, at 8:36 PM, Matthew Knepley wrote: > > > On Wed, Jun 15, 2011 at 1:20 AM, Barry Smith wrote: > > > > On Jun 14, 2011, at 7:59 PM, Jed Brown wrote: > > > > > On Wed, J

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-14 Thread Barry Smith
On Jun 14, 2011, at 8:36 PM, Matthew Knepley wrote: > On Wed, Jun 15, 2011 at 1:20 AM, Barry Smith wrote: > > On Jun 14, 2011, at 7:59 PM, Jed Brown wrote: > > > On Wed, Jun 15, 2011 at 02:53, Barry Smith wrote: > > It seems we should provide a DMSDA that is built specifically for > > stagg

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-14 Thread Barry Smith
On Jun 14, 2011, at 7:59 PM, Jed Brown wrote: > On Wed, Jun 15, 2011 at 02:53, Barry Smith wrote: > It seems we should provide a DMSDA that is built specifically for staggered > grids, with the correct number of "slots" in the correct "locations", it > would have appropriate grid hierarchies

[petsc-dev] Stokes and saddle point solvers in PETSc?

2011-06-14 Thread Barry Smith
On Jun 14, 2011, at 6:04 PM, Jed Brown wrote: > On Wed, Jun 15, 2011 at 00:10, Barry Smith wrote: > > It turns out that this is hard to test because Stokes problems usually have > mixed spaces of some sort. The collocated methods are generally not robust. > We currently have rather poor suppo