Search found 12 matches
- 08 Mar 2016, 07:54
- Forum: Elmer/Ice
- Topic: Pressure at the base in Full Stokes
- Replies: 2
- Views: 5949
Re: Pressure at the base in Full Stokes
Hi Peter, thanks for the answer. I looked into it some more, and it seems that the output I am getting has messed up pressure values in even numbered rows of nodes, while the odd numbered rows have correct values that are close to hydrostatic. This likely indicates there is an integer division error...
- 07 Mar 2016, 06:26
- Forum: Elmer/Ice
- Topic: Pressure at the base in Full Stokes
- Replies: 2
- Views: 5949
Pressure at the base in Full Stokes
Hi, I've been looking at the pressure values at the bottom row of nodes when solving full Stokes, and noticed that the values are different (and usually lower) than purely hydrostatic pressure. I figured out that it is because the pressure being output is for the normal-tangential coordinate system,...
- 20 Jul 2015, 07:26
- Forum: Elmer/Ice
- Topic: Problems with large meshes
- Replies: 3
- Views: 7827
Re: Problems with large meshes
BTW, if anyone else runs into this problem, upgrading to Mumps 5.0 fixed it.
- 18 Jul 2015, 03:44
- Forum: Elmer/Ice
- Topic: Problems with large meshes
- Replies: 3
- Views: 7827
Re: Problems with large meshes
Hi Fabien, thanks for the response. I believe the supercomputer I am using only has Mumps 4.9. My laptop has 4.10 and has never run into this problem. I'll insist more that they upgrade Mumps, and hopefully that will solve the problem. Unfortunately using Parstokes is not an option, since we are usi...
- 17 Jul 2015, 11:14
- Forum: Elmer/Ice
- Topic: Problems with large meshes
- Replies: 3
- Views: 7827
Problems with large meshes
Hello, I am currently trying to run a large (read: ice sheet sized) simulation, which demands a fairly fine resolution mesh. I am having problems with Mumps when using the Navier Stokes solver: ListToCRSMatrix: Matrix format changed from CRS to List problem with NIV2_FLOPS message -1.192092895507812...
- 29 May 2015, 16:08
- Forum: Elmer/Ice
- Topic: Rotated coordinate system for basal boundary condition
- Replies: 3
- Views: 7148
Re: Rotated coordinate system for basal boundary condition
Hi Peter, Thank you for the explanation. It turns out the problem I am having is not a problem with the rotation itself, but that we are using a reduced A matrix for DefaultSolve after the first time step. Somewhere in our code we have missed changing a pointer, so it is rotating too many nodes. Bec...
- 28 May 2015, 18:12
- Forum: Elmer/Ice
- Topic: Rotated coordinate system for basal boundary condition
- Replies: 3
- Views: 7148
Re: Rotated coordinate system for basal boundary condition
Just to follow up, after investigating the problem I am having with our code, it seems that the Back-Rotate routine is rotating not only the bottom layer of nodes, but also the layer directly above it. However, after exit from DefaultSolve, the second layer is not rotated back. Below is a stack of n...
- 26 May 2015, 14:28
- Forum: Elmer/Ice
- Topic: Rotated coordinate system for basal boundary condition
- Replies: 3
- Views: 7148
Rotated coordinate system for basal boundary condition
Hi, I am tracking down some issues in our code, and I am seeking some clarification on the way that Elmer handles the non-penetrating condition at the basal boundary condition (i.e. the ice cannot penetrate through the bedrock) in the Navier-Stokes solver. As I understand it, Elmer rotates the coord...
- 02 Apr 2015, 15:44
- Forum: Software development
- Topic: Memory leak problem with ParallelInitMatrix call
- Replies: 0
- Views: 3437
Memory leak problem with ParallelInitMatrix call
Hi there, First off, I am using Elmer revision 7111 on Linux Mint 17. I'm working on Josefin's modification to the Stokes solver in Elmer/Ice. I have been running into problems with memory leaks when running in parallel, which are significant (my computer runs out of memory on a 11,000 element simul...
- 13 Jan 2015, 15:48
- Forum: Elmer/Ice
- Topic: Elmer/Ice test cases
- Replies: 1
- Views: 6908
Re: Elmer/Ice test cases
Hi, Cheng Gong and I have been trying to run the Elmer/Ice test cases as well. Pretty much failing in the same spots, with the same errors. I have version 6874 on my computer, while Cheng Gong has something closer to the latest version (7098). We both had failures on the same tests (I assume the las...