Elmer Discussion Forum

Hello Juha,

thank you very much for your answer. As always, you are right. The analytical solution is only approximate and (although shown in the book with these parameters) it is quite far from the correct solution in this case.

Thanks a lot again,
Petra

Hi, i would like to reproduce the analytical solution for Couette flow with temperature-dependent viscosity and i am getting a wrong result... The setup is described in Turcotte and Schubert: Geodynamics, page 313. It is a steady flow between two boundaries, the left boundary moves with velocity v0 ...

Hello all, I am working with flow solver with complex rheology and I prescribe effective viscosity directly at integration points using EffectiveViscosity procedure. I would like to prescribe also density this way - would it be possible to add such a "EffectiveDensity" procedure in Elmer? ...

As far as I know, mixed elements are usually used when implementing visco-plastic rheology. Or some under-integration of stress terms or so. When I use bubble stabilization, resulting pressure is oscilating and it has unrealistic values. Then, a "penalty function" is used to treat pressure...

Thanks much for your answers. Is the StokesSolver the right solver for using mixed finite elements (e.g. linear in pressure and quadratic in velocities)? I was not able to understand the way to specify the mixed elements in the GRD file... But now i see there is a documentation to the StokesSolver, ...

Hello, I am trying to implement plasticity into Elmer and I need some more information about the solution of the Navier-Stokes equations. I am especially interested in the method of stabilization. Do you use penalty formulation? Do you use some form of one-point integration of pressure when using bi...