Search found 96 matches

by tzwinger
16 Jun 2021, 23:03
Forum: Bug reports
Topic: Linear Solver - Different behaviours on different OS
Replies: 4
Views: 146

Re: Linear Solver - Different behaviours on different OS

Hi Kevin, I just read that thread - I, personally, would not be that surprised to get different results on different installations (guess also processors?) from Glen's flow law that is regularized with an extremely low value of the critical shear rate. I do not exactly know the setup of your case, b...
by tzwinger
04 Jun 2021, 12:53
Forum: General
Topic: Can ModelPDE.F90 handle higher order finite elements ?
Replies: 6
Views: 161

Re: Can ModelPDE.F90 handle higher order finite elements ?

I think there is a table expressing the DOF's with regards to the different polynomial degrees in the documentation (https://www.nic.funet.fi/pub/sci/physic ... Manual.pdf) under chapter E1.
by tzwinger
02 Jul 2020, 21:35
Forum: Elmer/Ice
Topic: getFrictionLoads User Function resulting in segmentation fault error
Replies: 8
Views: 3939

Re: getFrictionLoads User Function resulting in segmentation fault error

I pushed a version to elmerice-branch that derives valid Equation from the parent element. Issues might occur on body-body boundaries, but the EISMINT case should now run without the extra body on the boundary.

Regards,
Thomas
by tzwinger
02 Jul 2020, 15:31
Forum: Elmer/Ice
Topic: getFrictionLoads User Function resulting in segmentation fault error
Replies: 8
Views: 3939

Re: getFrictionLoads User Function resulting in segmentation fault error

Hi, I think the core issue here is that you want to inquire something from an Equation section out of an USF that not directly relates to one (as else it'll be a Solver). In other words: there is no direct relation between USF's and Equation section. In the working example the only reason why it did...
by tzwinger
02 Jul 2020, 14:55
Forum: Elmer/Ice
Topic: getFrictionLoads User Function resulting in segmentation fault error
Replies: 8
Views: 3939

Re: getFrictionLoads User Function resulting in segmentation fault error

Hello, the issue lies within line 184 in USF_GetFrictionHeating.F90 Equation => GetEquation() Which picks the current element and tries to assign an Equation from it. In case the boundary element the USF is executed on has no assigned body (plus an Equation to be applied to it), this will be an unas...
by tzwinger
04 Jun 2020, 09:25
Forum: Elmer/Ice
Topic: Zero velocities in a finer mesh resolution
Replies: 3
Views: 3587

Re: Zero velocities in a finer mesh resolution

Martim, I know this answer comes vastly delayed, but could you try to use the new vectorized Navier Stokes solver with the block preconditioner to avoid running into memory issues? You can find examples on how to deploy it under the latest course pages http://elmerfem.org/elmerice/wiki/doku.php?id=c...
by tzwinger
04 Jun 2020, 09:18
Forum: Elmer/Ice
Topic: Spiky Ice Sheet Surface in transient flow line model
Replies: 6
Views: 3373

Re: Spiky Ice Sheet Surface in transient flow line model

Hello there is active work going on to get a remedy for this instability. But until then, I am afraid, the only way to avoid instability is to reduce the time-step size. In particular, the no-slip condition on the bedrock does not help. What is your minimum flow-depth (i.e., your RefZs - 0.1 ?). Inc...
by tzwinger
14 Apr 2020, 10:09
Forum: Installation & compilation
Topic: Build report Debian/testing (bullseye)
Replies: 9
Views: 3826

Re: Build report Debian/testing (bullseye)

Kai,
could you share "test-stderr_6.log" and "test-stdout_6.log" by their contents? This might give a clue on what went wrong.

Regards
Thomas
by tzwinger
29 Jan 2020, 11:17
Forum: Elmer/Ice
Topic: Time step dependency for Stokes grounding line
Replies: 5
Views: 4245

Re: Time step dependency for Stokes grounding line

I think every initialization run of any real-world geometry with marine ice sheets involved (e.g., Antartica from BedMap2 or perhaps even BedMachine) faces that issue, as shelf-geometries usually are inconsistent with floatation.
by tzwinger
17 Dec 2018, 10:43
Forum: Elmer/Ice
Topic: Elmer ice install
Replies: 8
Views: 7575

Re: Elmer ice install

Hello,
yes, the launchpad version should include Elmer/Ice

Regards,
Thomas