# The KH Test problem creates two fluids moving antiparallel to each other
# in a periodic 2D grid (inner fluid and outer fluid). The inside fluid
# has a higher density than the outside fluid. There is a slight ramp region
# in density and x-velocity connecting the two regions so there are no
# discontinuities in the flow. The y-velocity is perturbed with small sinusoidal
# perturbation. As the flows shear past each other, the KH instability
# is excited, which develops over time. This test watches the evolution of
# those instabilities.
#
# This version incorporates 1 level of AMR using the shear criterion on the
# interface between the two fluids. --Cameron Hummels, 2013
#
# define problem
#
ProblemType = 8 // KH test problem
Gamma = 1.4
#
# grid setup
#
TopGridRank = 2
TopGridDimensions = 256 256
#
# problem parameters
#
KHRamp = 1
KHRampWidth = 0.02
KHPerturbationAmplitude = 0.1
KHBulkVelocity = 0.0
#
# set I/O and stop/start parameters
#
StopTime = 1.5
dtDataDump = 0.0025
DataDumpName = DD
DataDumpDir = DD // output files use this as prefix
#
# set hydro parameters
#
HydroMethod = 0 // PPM = 0, Zeus = 2, MUSCL = 3
CourantSafetyNumber = 0.4
#
# set grid refinement parameters
#
StaticHierarchy = 0 // dynamic hierarchy
MaximumRefinementLevel = 2
RefineBy = 2 // refinement factor
CellFlaggingMethod = 9 // Shear for refinement
MinimumShearForRefinement = 0.02
#
# set some global parameters
#
tiny_number = 1.0e-7