Search found 4826 matches

by raback
07 Dec 2010, 23:17
Forum: ElmerSolver
Topic: Heat Transfer Coefficient
Replies: 6
Views: 7662

Re: Heat Transfer Coefficient

Hi, Looking at your original sif it seems at least that you're applying the "-discont" flag to a wrong bc (2 vs. 4). Also, if your "hand" is really at known temperature why wont you just skip the conduction in there and just solve the temperature in the air. I mean a proper therm...
by raback
07 Dec 2010, 02:05
Forum: General
Topic: Can I solve this with Elmer
Replies: 4
Views: 4170

Re: Can I solve this with Elmer

Hi Cris Well, I guess it might work. There is actually a nonlinear version (called ElasticSolver) of the StressSolver which would eliminate the need for mesh adaptation (unfortunately it doesn't have stress computation...). No matter which you choose there would probably be a limit on how soft the m...
by raback
06 Dec 2010, 19:12
Forum: ElmerSolver
Topic: Helmholtz solver excitation at selected node
Replies: 8
Views: 4902

Re: Helmholtz solver excitation at selected node

Hi, When your field is named "Pressure Wave" the Dirichlet condition should be given to "Pressure Wave 1" and "Pressure Wave 2", correspondingly. -Peter
by raback
06 Dec 2010, 01:02
Forum: ElmerSolver
Topic: Greenhouse simulation
Replies: 3
Views: 2948

Re: Greenhouse simulation

Hi 1) Yes, that's right. However, if the time-scales allow perhaps you could solve over so many periods (be it a day, or a year) that the history effect vanishes. Still you have to make some guess. You could also start off with a very long time and average enforcing. This should give you quite close...
by raback
06 Dec 2010, 00:45
Forum: General
Topic: Can I solve this with Elmer
Replies: 4
Views: 4170

Re: Can I solve this with Elmer

Hi, Unfortunately not. The little work on contact models has been experimental and limited in functionality. -Peter
by raback
04 Dec 2010, 02:10
Forum: ElmerSolver
Topic: Helmholtz solver excitation at selected node
Replies: 8
Views: 4902

Re: Helmholtz solver excitation at selected node

Hi Create a new BC section and instead of refering to "Target Boundaries" give "Target Coordinates". The closest node to the coordinate value will be chosen, for example Boundary Condition 7 Name = "FixedNode" Target Coordinates(1,3) = 1.2 2.3 0.0 Pressure 1 = Real 0.0 ...
by raback
02 Dec 2010, 18:15
Forum: External tools
Topic: Combination of .vtu results
Replies: 2
Views: 3653

Re: Combination of .vtu results

Hi

This should not be needed since many programs, such as Paraview and ViSit, can read the partitioned data. Just open the .pvtu file therein.

-Peter
by raback
02 Dec 2010, 13:47
Forum: ElmerSolver
Topic: Adaptive Timestepping
Replies: 9
Views: 9129

Re: Adaptive Timestepping

Hi I would never have found out by myself what you have suggested (timestepping method = explicit Euler - what is that, and why is it better here? etc. etc.). Time integration methods such as the explicit Euler are not limited to just to FEM. In fact in FEM the time discretization is the only one th...
by raback
01 Dec 2010, 19:26
Forum: Updates
Topic: Elmer channel on Youtube
Replies: 1
Views: 14146

Elmer channel on Youtube

Hi All, Just for the fun of it, there is now a youtube channel for Elmer movies. See http://www.youtube.com/user/elmerfem It's biassed towards some fresh developments on particle trackers but hopefully with time it will more representative to all the features of Elmer. If you have, or intend to put,...
by raback
01 Dec 2010, 10:55
Forum: ElmerSolver
Topic: Divergence (with NaN steps) for Navier-Stokes equation
Replies: 16
Views: 13017

Re: Divergence (with NaN steps) for Navier-Stokes equation

Hi About ElmerGrid and gmsh: If you do not use physical entities then by default the mesh is cleaned and renumbered. This means that the '-autoclean' flag is enforced. This is because the default numbering of geometric entities is not ideal for Elmer. Also gmsh does not seem to be consistant with th...