## Re: [Libmesh-users] Multiple equatiosn with different orders of interpolation

 Re: [Libmesh-users] Multiple equatiosn with different orders of interpolation From: Kirk, Benjamin (JSC-EG311) - 2013-02-15 16:49:02 On Feb 15, 2013, at 10:41 AM, "David Knezevic" wrote: > > On 02/15/2013 11:39 AM, Subramanya Gautam Sadasiva wrote: >> Hi, >> I am trying to solve a problem with multiple system objects as part of the same equation syztems object. One of them ( A navier stokes solver ) needs quad9 elements and the other one a cahn hilliard solver, I want to solve using QUAD4 elements. Is this possible on a single mesh?. The code does not work when I try to do this. > > Sure, that should be no problem. > > David The trick is the difference between geometric elements and finite elements. Your mesh will need Quad9 geometric elements, but you can add bilinear, biquadratic, hierarchic, whatever finite element approximations. -Ben

 [Libmesh-users] Multiple equatiosn with different orders of interpolation From: Subramanya Gautam Sadasiva - 2013-02-15 16:39:49 Hi, I am trying to solve a problem with multiple system objects as part of the same equation syztems object. One of them ( A navier stokes solver ) needs quad9 elements and the other one a cahn hilliard solver, I want to solve using QUAD4 elements. Is this possible on a single mesh?. The code does not work when I try to do this. Thanks, Subramanya Sadasiva "But memory eventually fades. Turbulences damp out, internal strains yield to plastic flow, concentration inhomogeneities diffuse to uniformity. Systems tend to subside to very simple states,independent of their specific history." Herbert Callen . Thermodynamics and an Introduction to Thermostatics.
 Re: [Libmesh-users] Multiple equatiosn with different orders of interpolation From: David Knezevic - 2013-02-15 16:41:31 On 02/15/2013 11:39 AM, Subramanya Gautam Sadasiva wrote: > Hi, > I am trying to solve a problem with multiple system objects as part of the same equation syztems object. One of them ( A navier stokes solver ) needs quad9 elements and the other one a cahn hilliard solver, I want to solve using QUAD4 elements. Is this possible on a single mesh?. The code does not work when I try to do this. Sure, that should be no problem. David
 Re: [Libmesh-users] Multiple equatiosn with different orders of interpolation From: Kirk, Benjamin (JSC-EG311) - 2013-02-15 16:49:02 On Feb 15, 2013, at 10:41 AM, "David Knezevic" wrote: > > On 02/15/2013 11:39 AM, Subramanya Gautam Sadasiva wrote: >> Hi, >> I am trying to solve a problem with multiple system objects as part of the same equation syztems object. One of them ( A navier stokes solver ) needs quad9 elements and the other one a cahn hilliard solver, I want to solve using QUAD4 elements. Is this possible on a single mesh?. The code does not work when I try to do this. > > Sure, that should be no problem. > > David The trick is the difference between geometric elements and finite elements. Your mesh will need Quad9 geometric elements, but you can add bilinear, biquadratic, hierarchic, whatever finite element approximations. -Ben
 Re: [Libmesh-users] Multiple equatiosn with different orders of interpolation From: David Knezevic - 2013-02-15 16:54:37 On 02/15/2013 11:48 AM, Kirk, Benjamin (JSC-EG311) wrote: > > On Feb 15, 2013, at 10:41 AM, "David Knezevic" wrote: > >> On 02/15/2013 11:39 AM, Subramanya Gautam Sadasiva wrote: >>> Hi, >>> I am trying to solve a problem with multiple system objects as part of the same equation syztems object. One of them ( A navier stokes solver ) needs quad9 elements and the other one a cahn hilliard solver, I want to solve using QUAD4 elements. Is this possible on a single mesh?. The code does not work when I try to do this. >> Sure, that should be no problem. >> >> David > The trick is the difference between geometric elements and finite elements. Your mesh will need Quad9 geometric elements, but you can add bilinear, biquadratic, hierarchic, whatever finite element approximations. Yes, sorry my post didn't actually point out the answer!