• Solver Fortran File: ComputeStrainRate.f90
• Solver Name: ComputeStrainRate
• Required Output Variable(s): default is StrainRate (else in StrainRate Variable Name)
• Required Input Variable(s): A Flow Solution (in Flow Solution Name)
• Optional Output Variable(s): None
• Optional Input Variable(s): None

The aim of this solver is to compute the strain-rate tensor from the flow solution. For a 2D simulation there are 5 DOFs (E11, E22, E33, E12, Eii) and for a 3D simulation, 2 additional (7 DOFs) are being solved for (E11, E22, E33, E12, E23, E31, Eii). This solver uses a dummy variable and solves 5 (7 in 3D) times a 1 DOF system for each strain-rate components and the trace of the strain-rate tensor (Eii).

The Strain-rate tensor is computed using:

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

Solver 1
  Equation = "Strain Rate"
  Procedure = "ComputeStrainRate" "ComputeStrainRate"
! this is just a dummy, hence no output is needed
!-----------------------------------------------------------------------  
  Variable = -nooutput "Eij"
  Variable DOFs = 1

  Exported Variable 1 = "StrainRate"
  Exported Variable 1 DOFs = 5

! the name of the variable containing the flow solution (U,V,W,Pressure)
!-----------------------------------------------------------------------
  Flow Solver Name = String "Flow Solution"
! the name of the strain-rate solution (default is 'StrainRate')
  StrainRate Variable Name = String "StrainRate"
  
  Linear System Solver = Direct
  Linear System Direct Method = umfpack
End

Download an example using this solver. TODO