Elmer Discussion Forum

Hi Jean, Just a suggestion: if your mesh file is in the Elmer format (mesh.header, mesh.nodes, mesh.boundary, mesh.elements) just take a look at the mesh.boundary files and to the reference in the ElmerSolver Manual appendix A. If you are familiar with any programming language, you will find easy to...

Hi Lars, just some comments on the turbulent problem: - The K and epsilon values must be specified only in the inflow boundary and in the initial condition. The wall law (and its laminar counterpart) sets internally proper values for their boundary conditions on walls. - If the simulation is steady,...

Hi Sebastien, an example (Reynolds number, 2D, compressible flow, air, ideal gas, Sutherland law for viscosity-temperature relation): Body Force 1 Re_number = Variable Temperature, Pressure, Velocity 1, Velocity 2 Real MATC "(101325+tx(1))/287/tx(0)*sqrt(tx(2)²+tx(3)²)/(1.716e-05*(tx(0)/273.15)...

Hi Supituki,

Elmer Models manual, p.17: http://www.nic.funet.fi/pub/sci/physics ... Manual.pdf

Regards,

Cesar

Hi Iweb, the KE Clip is a limiter. The turbulent kinetic energy and its dissipation must be positive, so, to ensure it, the following condition is applied to all the nodal values of the variables (KESolver.src, lines 428 to 451): !---------------------------------------------------------------------...

Hi, some ideas after a first look to your sif file: - You must set the inlet values of the turbulent variables (Kinetic Energy and Kinetic Dissipation), not only its initial values. - The boundary condition for the wall is wrong. You must use a wall law for the K-Epsilon turbulence model, as long as...

Hi all, it seems to me that the colder parts are those elements with, at least, a nonzero viewfactor to some element on the other cylinder, so part of the radiation flux goes to the other cylinder (even a zero net flux if the temperatures are equal) and the rest goes (ideally) to the surroundings. T...

Hi,

if you use Linux you can take a look at ATLAS:

http://math-atlas.sourceforge.net/

Debian and Ubuntu (and all major distros, I suppose) have ATLAS packages. A custom compilation will perform even better (and will let you choose between serial and threaded libs).

Regards,

Cesar

Hi carsten, when the radiation exchange takes place into an open enclosure you can use the keywords: Radiation Boundary Open = Logical True Radiation External Temperature = Real xxxx The first one avoids the normalization of the view factors (as long as an angle fraction is lost for some or all of t...

Hi Peter, thank you very much. That was what I supposed. If someone cares, the segmentation fault disappears changing the line 132 of the GebhardtFactors.src file. Where it says: Model => LoadModel( ModelName,.FALSE. ) it must say: Model => LoadModel( ModelName,.FALSE.,1,0 ) Besides, this stand-alon...