Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-03 Thread John Peterson
> On Sep 3, 2015, at 5:12 AM, David Knezevic wrote: > >> On Thu, Sep 3, 2015 at 4:18 AM, Julian Andrej wrote: >> >> I tried Davids tip with the CondensedEigenSystem. For the scalar >> valued problem of a laplace operator it works very good, but i still >> have no correct solution for the Stok

Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-03 Thread David Knezevic
On Thu, Sep 3, 2015 at 4:18 AM, Julian Andrej wrote: > I tried Davids tip with the CondensedEigenSystem. For the scalar > valued problem of a laplace operator it works very good, but i still > have no correct solution for the Stokes equations. > > It seems i'm assembling the Mass matrix in a wron

Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-03 Thread Julian Andrej
I tried Davids tip with the CondensedEigenSystem. For the scalar valued problem of a laplace operator it works very good, but i still have no correct solution for the Stokes equations. It seems i'm assembling the Mass matrix in a wrong way. Using the notation of the example, is it correct, that th

Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-01 Thread Julian Andrej
I am aware of that, but I think i should get a bunch of 1 eigenvalues (number depending on the problem size and thus number of Dirichlet BCs) and then the correct eigenvalues for my problem with the posted code. On Tue, Sep 1, 2015 at 6:38 PM, David Knezevic wrote: > On Tue, Sep 1, 2015 at 12:35

Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-01 Thread David Knezevic
On Tue, Sep 1, 2015 at 12:35 PM, Julian Andrej wrote: > On Tue, Sep 1, 2015 at 6:15 PM, John Peterson > wrote: > > > > > > > On Tue, Sep 1, 2015 at 8:29 AM, Julian Andrej > wrote: > > > >> I'm trying to get into libMesh, so i tried to convert an existing > project. > >> > >> So far i could repr

Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-01 Thread Julian Andrej
On Tue, Sep 1, 2015 at 6:15 PM, John Peterson wrote: > > > On Tue, Sep 1, 2015 at 8:29 AM, Julian Andrej wrote: > >> I'm trying to get into libMesh, so i tried to convert an existing project. >> >> So far i could reproduce the lid driven cavity case for the Stokes >> equations like in >> example

Re: [Libmesh-users] Physical eigenvalues of the stokes equations

2015-09-01 Thread John Peterson
On Tue, Sep 1, 2015 at 8:29 AM, Julian Andrej wrote: > I'm trying to get into libMesh, so i tried to convert an existing project. > > So far i could reproduce the lid driven cavity case for the Stokes > equations like in > example examples/systems_of_equations/systems_of_equations_ex1. > > Now i'