Search found 63 matches
- 19 Jul 2011, 06:05
- Forum: ElmerSolver
- Topic: Legacy VTK saving in ElmerSolver v6.1
- Replies: 4
- Views: 3331
Legacy VTK saving in ElmerSolver v6.1
I've recently upgraded ElmerSolver from version 5.5.0 to version 6.1 (as displayed with 'elmersolver -v') and there seem to be some important differences in how the legacy vtk files are written. I'm using this .sif fragment to write vtk files: Solver 3 Exec Solver = After Simulation Procedure = &quo...
- 02 May 2011, 21:25
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
Forgot to mention: the distance between the fins in the direction of the air flow is 3.25cm.
- 02 May 2011, 21:12
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
Hi Peter, thanks for the feedback. As I've mentioned, I'm not an expert in thermal analysis, so can't answer your questions regarding laminar flow and Reynolds number. I'm including the .sif file, maybe it has the answers to your questions. Header CHECK KEYWORDS Warn Mesh DB "." "demo...
- 02 May 2011, 18:27
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
The last slice picture:
Tibi
Thanks,Tibi
- 02 May 2011, 18:26
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
I've re-modeled the heatsink to have only 5 fins in the direction of the airflow, with plenty of space between the fins. heatsink3d.jpg This time I've done the simulation on a simplified system model, which had only the airbox and this new heatsink (no other components -- the model discussed above h...
- 30 Apr 2011, 01:31
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
In the slice through the middle of the fins I can see at least 7 triangles on a few spot checks -- so I assume 7 tetrahedras. That's a good suggestion (starting with fewer fins), but it's still strange there's no flow. Unfortunately, for now, I cannot go with a much finer mesh than 308K elements bec...
- 29 Apr 2011, 22:55
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
> The normal velocity should be set to zero by some means, there are more than one way to do that though. I've tried all combinations of setting/not setting the velocity and "normal-tangential velocity", but I'm stumped. Basically when I set "normal-tangential velocity", the enti...
- 29 Apr 2011, 18:07
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
I've searched in the documentation for Steady State Iterations and, in the examples, it's always set to 1. Probably the sif file was created from examples in the documentation, so that's why it's one. I've also looked at Solver 4 (the KEpsilon solver), and it has the line "Exec Solver = Never&q...
- 29 Apr 2011, 17:47
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
That's part of the inheritance, I don't know why it's that number of iterations. Is there a better value that I should put there? For the boundary conditions between air and solids, I've set the wall law to true and set the boundary thickness, but did not set the velocity to zero. It did show air go...
- 28 Apr 2011, 22:52
- Forum: ElmerSolver
- Topic: Cooling problem
- Replies: 27
- Views: 14981
Re: Cooling problem
Right, sorry, I should've started with the geometry. Here's the system without the air box: 3d_view.jpg So, I have a component (at the bottom, with the rounded edges) and on top of it is a heatsink (the one with a lot of rectangular fins -- it's not the most performant heatsink out there, just somet...