Elmer Discussion Forum

Helo, I'm uncertain about how to set k-epsilon parameters in Elmer. Short overview: Turbulent kinetic energy: ([0.16*Re^(-1/8)]^2 ) * 1.5 dissipation: [k^1.5/(characteristic length)] * (model constant=0.09) reference source: http://www.cfd-online.com/Wiki/Turbulence_free-stream_boundary_conditions s...

Hi, here are the first images, crude mesh only. I had problems with finer resolution (really), and I still have to find a workaround for the "leak" visible in the hemisphere version, so these are just previews. I know that the momentum theory prescribes the neccessary dI/dt for the given r...

Hi, many thanks for your help, I'll try them out. Actually, I've already found the External Pressure and Pressure <1|2|3> options. I tried them, and they worked, albeit not perfectly. I had a problem with discretization, just as you'd predicted. The meshing gave the best result when the resolution w...

In the meanwhile, I thought of specifying the pressure jump condition on a permeable surface by MATC. Is it possible? Maybe in a tangential coordinate system, an expression takes the pressure a small distance away in normal direction, and adds the pressure jump to it, then sets this new pressure as ...

Right now I can't send you files, but it's just 3 points, and 3 lines between them.
I use the 2.7.1 version. Thank you for the link, I'll ask this there.

Bye

Hi, I'm new in Gmsh and in Elmer. I'm trying to build simple geometries in Gmsh, and when I arrive at defining a planar surface by its boundaries, Gmsh crashes. (Viewport prompt: "Select hole boundaries (if none, press 'e')"). Right after I press 'e', it crashes. In this case, the boundari...

I'd like to model a fan with an infinitely thin disk with a prescribed pressure jump (http://en.wikipedia.org/wiki/Actuator_disk). How can I set a pressure difference
boundary condition in Elmer?