GroundedSolver.md

Solver Grounded Solver

General Information

• Solver Fortran File: GroundedSolver.f90

• Solver Name: GroundedSolver

• Required Output Variable(s): GroundedMask (user defined)

• Required Input Variable(s): Need to read the bedrock, which can be either a variable or a material parameter (default is the material parameter 'Min Zs Bottom')

• Optional Output Variable(s): None

• Optional Input Variable(s): None

Versions

The solver GroundedSolverInit has been suppressed (version 7078). Instead, the solver GroundedSolver should be executed twice (one before the simulation and one at each time step).

General Description

The aim of these solvers is to compute a mask to qualify which part of the bed is grounded, which one is floating and which one belongs to the grounding line. The GroundedMask value is +1 where grounded, -1 where floating and 0 on the grounding line.

SIF contents

The required keywords in the SIF file for this solver are:

To initialise the GroundedMask variable

Solver 1
  Exec Solver = Before All
  Equation = "GroundedMask"
  Variable = "GroundedMask"
  Variable DOFs = 1
  Procedure = "ElmerIceSolvers" "GroundedSolver"
  ! Give a tolerance for the bedrock
  Toler = Real 1.0e-03
  
  ! DEFAULT: Bedrock is read in the material parameter "Min Zs Bottom"
  !! OR Use this keyword if the bedrock is given as a variable
  ! Bedrock Variable = String "bedrock"
  !! OR use this keyword if the bedrock is given as a material parameter
  ! Bedrock Material = String "Min Zb"  
End

To get the new value of GroundedMask. To be executed just after the mesh update.

Solver 15
  Equation = "GroundedMask"
  Variable = "GroundedMask"
  Variable DOFs = 1
  Procedure = "ElmerIceSolvers" "GroundedSolver"

  Toler = Real 1.0e-3

  ! DEFAULT: Bedrock is read in the material parameter "Min Zs Bottom"
  !! OR Use this keyword if the bedrock is given as a variable
  ! Bedrock Variable = String "bedrock"
  !! OR use this keyword if the bedrock is given as a material parameter
  ! Bedrock Material = String "Min Zb" 
End

The bedrock elevation is read through the keyword Min Zs Bottom which is in the Material section. Here bedrock is a variable which contains the bedrock elevation.

Material 1
  ...
  Min Zs Bottom = Equals bedrock
  Max Zs Bottom = Real 1.0e6
End

Examples

An example testing the Grounded solver can be found in [ELMER_TRUNK]/elmerice/Tests/Grounded. See also GL_MISMIP and Contact (also in the Tests directory).