cube504_sigma.sif

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! All units are in MPa - m - a 
! Temperature is in Kelvin
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

check keywords warn
 echo on

$yearinsec = 365.25*24*60*60
$rhoi = 900.0/(1.0e6*yearinsec^2)   
$B = 20.0 ! MPa-3a-1 T = -2°C
$n = 3.0
$gravity = -9.81*yearinsec^2

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! HEADER
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Header
  Mesh DB "." "mesh_504"
End


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! CONSTANTS
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Constants
  Gas Constant = Real 8.314D00 ! in m-k-s
  Stefan Boltzmann = Real 6.78E-08
  Density Name = String "Relative Density"
End

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! SIMULATION
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Simulation
  Coordinate System  = "Cartesian 3D"
  Coordinate Mapping(3) = Integer 1 2 3
  Simulation Type ="Steady"
  Output Intervals = 1
  Steady State Max Iterations = 1
  Steady State Min Iterations = 1

  Output File = "cube504_sigma.result"
  Post File = "cube504_sigma.ep"

  max output level = 20
End


! this is the compressible Stokes solver
!----------------------------------------
Solver 1
  Equation = String "PorousFlow"
  Procedure = "ElmerIceSolvers" "PorousSolver"
  Variable = "Porous"
  Variable DOFs = 4

  Optimize Bandwidth = False
! Use p elements
  Element = "p:1 b:4"
  Stablization Method = String pBubbles

  Exported Variable 1 = String "Relative Density"
  Exported variable 1 DOFs = Integer 1

  ! switch that in for post-processing issues only
  ! ----------------------------------------------
   Exported Variable 2 = String "StrainRate"
   Exported variable 2 DOFs = Integer 6
   Exported Variable 3 = String "DeviatoricStress"
   Exported variable 3 DOFs = Integer 6

  Linear System Solver = "Iterative"
  Linear System Iterative Method = "BiCGStab"
  Linear System Max Iterations = 500
  Linear System Convergence Tolerance = 1.0E-07
  Linear System Abort Not Converged = True
  Linear System Preconditioning = "ILU0"

  Nonlinear System Convergence Tolerance = 1.0E-05
  Nonlinear System Max Iterations = 50

  Steady State Convergence Tolerance = 1.0E-03
End

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! BODIES (i.e., domains to compute on)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Body 1
  Equation = 1
  Material = 1
  Body Force = 1
  Initial Condition = 1
End

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! EQUATION
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Equation 1
 Active Solvers(1) = 1
 Flow Solution Name = String "Porous"
End

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! INITIAL CONDITIONS
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Initial Condition 1
  Porous 1 = Real 0.0E0
  Porous 2 = Real 0.0E0
  Porous 3 = Real 0.0E0    
  Porous 4 = Real 0.0E0
  Relative Density =  Real 0.50D00
End


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! BODY FORCE
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Body Force 1
  Porous Force 1 = Real 0.0E00
  Porous Force 2 = Real 0.0E00
  Porous Force 3 = Real 0.0E00
! Porous Force 3 = Real $gravity*rhoi 
End

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! MATERIAL
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Material 1
  Powerlaw Exponent = Real $n 
  Min Second Invariant = Real 1.0E-10
  Fluidity Parameter = Real $B  ! MPa^{-3}a^{-1} 

  Density = Variable Relative Density
        Real MATC "tx*rhoi"
End


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! BOUNDARY CONDITIONS
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! z = 1            
Boundary Condition 1
  Target Boundaries = 6
  Force 3 = Real -0.01
End

!! z = 0    
!!!!!!!!!!!
Boundary Condition 2
  Target Boundaries  = 5
  Porous 3 = Real 0.0
End

!! y = 0
!!!!!!!!!!!!!!!!!!!
Boundary Condition 3
  Target Boundaries = 1
  Porous 2 = Real 0.0     
End

!! x = 0   
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Boundary Condition 4
  Target Boundaries = 4
  Porous 1 = Real 0.0     
End