Elmer Discussion Forum

Again there are at least two ways (copy-pasting myself). Both may require manual editing of the .sif file. 1) The more accurate and consistant one uses the residual of the discrete system r=Ax-b where A does not include the effect of BCs. For heat equation the residual includes the nodal heat fluxes...

There are at least two options in Elmer suite (modified from Juha's old mail): a) Add manually the flux computation solver "FluxSolver" to the .sif file, and let the ElmerSolver compute the flux. Then you should have the flux ("vector: Flux") in the .ep file. See Ch. 30 in http:/...

Hi Adam, Yes, the Lagrangian approach requires a lot of particles and its still randomized meaning that there will never be convergence in traditional sense. There are good reasons to be suspicious. If the terminal velocity is just a function of bubble size as in http://www.bubbleology.com/Hydrodyna...

Here's a question on multiphase flows that was sent to the now obsolite discussion list. Greetings, I would like to model liquid flow driven by bubbles -- not a few, as can be done with level set, but hundreds or thousands, enough to use a continuum method. The bubbles and the liquid need to have th...

Unfortunately not. In modeling blood flow in large arteries nonreflecting conditions have been achieved using coupling to 1D models (see Elmer Tutorials). Unfortunately this is hardly a generic solution for the problem. Did you have some suitable implementation in mind (e.g. perfectly macthed layer,...

Hi Selim,

The matc function rand expects the size of the matrix as an argument (an integer not a real as the argument tx). So try with rand(1) instead.

BR, Peter

The Navier-Stokes equation of Elmer includes a drag force that is proportional to velocity as in Darcy flow. The test case in $ELMER_HOME/tests/PorousPipe is an example of this. The following definitions are needed in the material section: Porous Media = Logical True Porous Resistivity(2) = Real 1.0...

Ok. It seems that the vector way of defining the load didn't work. You have to do it component-wise. See the updated instructions.

BR, Peter

The following examples might be useful: To set a force of 1 N in x-direction at the node closest to origin in 2D: Boundary Condition 2 Target Coordinates(1,2) = Real 0.0 0.0 Displacement 1 Load = Real 1.0 End To set a force of 10 N in z-direction at the node 123 in 3D: Boundary Condition 2 Target No...

Hi Haibo ElmerGrid is a command-line tool. You probably got the installation right but you just need to run it from your command prompt. The functionality of ElmerGrid is for the most parts build in also in the ElmerGUI plug-in. Elmer suite does not include any geometry creation tools. Simple geomet...