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Warning: Undefined array key "media" in /home/np29546/public_html/elmerice/wiki/feed.php on line 397 Elmer/Ice Wiki problems
http://elmerfem.org/elmerice/wiki/
2024-07-03T11:27:56+00:00Elmer/Ice Wiki
http://elmerfem.org/elmerice/wiki/
http://elmerfem.org/elmerice/wiki/lib/tpl/arctic/images/favicon.icotext/html2019-10-18T10:05:53+00:00Anonymous (anonymous@undisclosed.example.com)problems:calving
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:calving&rev=1571393153&do=diff
Calving
Elmer/Ice includes the ability to predict and simulate the evolution of a calving glacier in 2D and in 3D.
Both the 2D and 3D calving models implement the 'Crevasse Depth Calving Criterion', which predicts calving events based on the penetration of surface and basal crevasses (Benn et al. 2007). However, most of the effort involves what happenstext/html2013-04-23T10:18:40+00:00Anonymous (anonymous@undisclosed.example.com)problems:data
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:data&rev=1366712320&do=diff
Reading Data
When dealing with real problems, real geometries and/or real datasets, there is the need of interpolating these data on the model mesh. Depending on the dataset format, different tools are available to help you doing that.
* Data in netCDF format can be read and interpolated on the mesh using thetext/html2012-11-13T20:49:07+00:00Anonymous (anonymous@undisclosed.example.com)problems:flowline
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:flowline&rev=1352839747&do=diff
Flow Line Geometry
Flow line geometry model relies on the hypothesis of plane strain. However, force can be added to account for the lateral friction occurring on the lateral walls of the glacier, ice-stream or ice-shelf. This can be done using the concept of shape factor trough thetext/html2014-11-13T10:07:48+00:00Anonymous (anonymous@undisclosed.example.com)problems:groundingline
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:groundingline&rev=1415873268&do=diff
Grounding Line Dynamics
In Elmer/Ice, the dynamics of the grounding line is treated as a contact problem between the bedrock and the ice. We didn't use the floating hypothesis to determinate the GL position, neither we impose a Schoof type condition at the GL.text/html2017-06-22T13:26:51+00:00Anonymous (anonymous@undisclosed.example.com)problems:hydro
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:hydro&rev=1498138011&do=diff
Basal Hydrology models
There is two basal hydrology models implemented right now in Elmer/Ice.
Double Continuum Equivalent Hydrological Model
General Description
The model consist of two solvers, one is used for the inefficient drainage system (text/html2020-05-12T12:55:13+00:00Anonymous (anonymous@undisclosed.example.com)problems:inverse
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:inverse&rev=1589288113&do=diff
Inverse Methods
Two variational inverse methods have been implemented within Elmer/Ice to inverse either the basal friction coefficient field beta(x,y) or the fluidity parameter A(x,y,z). Both methods are based on the minimisation of a cost function that measures the mismatch between modelled and observed velocities. These two methods are:text/html2015-03-09T15:01:35+00:00Anonymous (anonymous@undisclosed.example.com)problems:ismip
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:ismip&rev=1425913295&do=diff
ISMIP-HOM tests
The input files to perform the ISMIP-HOM experiments (Pattyn et al., 2008, Gagliardini and Zwinger, 2008) A, B, C, D and F can be found in the [ELMER_TRUNK]/elmerice/examples/ISMIP-HOM directory.
To change the length of the domain, you have to modify simultaneously the mesh geometry (text/html2019-04-13T13:12:53+00:00Anonymous (anonymous@undisclosed.example.com)problems:parstokes
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:parstokes&rev=1555161173&do=diff
ParStokes: Iterative Solver for Large-Scale Glaciological Applications
Alternatives
Since March 2019, a new vectorized Stokes solver which further is capable of utilizing the library version of the block preconditioning is available. We recommend using this one.
Introductiontext/html2021-07-12T07:06:51+00:00Anonymous (anonymous@undisclosed.example.com)problems:rheology
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:rheology&rev=1626073611&do=diff
Rheology
There are various ice rheology implemented in Elmer/Ice.
Glen's flow law
This is a SIF entry for Glen's flow law (after: Cuffey and Paterson, 2010. The Physics of Glaciers. Pergamon Press, Oxford etc., 4th edt.) using the built-in Elmer viscosity law (recommended, as it is evaluated at Gauss-points):text/html2016-11-11T12:38:01+00:00Anonymous (anonymous@undisclosed.example.com)problems:scaling
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:scaling&rev=1478867881&do=diff
Dimensional Scaling
Elmer(/Ice) does not know about unit systems. You can create your mesh and run your case in any unit system you like. The user is responsible to define a dimensionally consistent setup. This gives the oportunity to switch from the usually used SI units, metres-kilogramm-seconds (m-kg-s) to a unit system that still has a unit lengths of metres, but yields pressures in Megapascal and measures unit-time in years (m-MPa-a). If using the value the value 3.1556926E+07 s/a (seconds…text/html2019-04-13T13:06:59+00:00Anonymous (anonymous@undisclosed.example.com)problems:sidebar
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:sidebar&rev=1555160819&do=diff
* Problems
* Calving
* Dimensional scaling
* Flow Line Geometry
* Full-Stokes
* Grounding Line
* Block pre-conditioning Stokes
* Vectorized Stokes Solver
* Hydrology
* Inverse Methods
* ISMIP-HOM tests
* Reading Data
* Rheology
* Basal slidingtext/html2017-11-22T18:05:15+00:00Anonymous (anonymous@undisclosed.example.com)problems:sliding
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:sliding&rev=1511373915&do=diff
Several sliding relations are available with Elmer/Ice.
* Budd Friction Law
* Coulomb Friction Law
* Weertman Friction Lawtext/html2013-04-25T11:42:48+00:00Anonymous (anonymous@undisclosed.example.com)problems:stokes
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:stokes&rev=1366890168&do=diff
A template for a typical Stokes Solver sif-entry:
Solver 1
Equation = "Navier-Stokes"
Stabilization Method = String Bubbles
Flow Model = Stokes
Linear System Solver = Direct
Linear System Direct Method = umfpack
Nonlinear System Max Iterations = 100
Nonlinear System Convergence Tolerance = 1.0e-5
! first 5 iterations or convergence < 1.e-2 before moving from
! Picard to Newton
Nonlinear System Newton After Iterations = 5
Nonlinear System Newton After Tolerance = 1.0e-…text/html2019-04-13T13:53:29+00:00Anonymous (anonymous@undisclosed.example.com)problems:vectstokes
http://elmerfem.org/elmerice/wiki/doku.php?id=problems:vectstokes&rev=1555163609&do=diff
Vectorized incompressible Navier Stokes Solver (IncompressibleNSVec)
Since March 2019, this solver is in the distribution of Elmer. It has more or less the functionality of the legacy Navier-Stokes solver, i.e., is able to use any linear solution procedure (including the library version of block-preconditioner). The difference and improvement in performance is given by the vectorized assembly routines utilizing a general way of SIMD enables bi-linear forms. Since this uses OpenMP SIMD instructi…