Runtime Parameters Documentation for FLASH Release 4.7.1

numericalTools/RungeKutta/RungeKuttaMain
    rk_stepSizeConfinementFactor [REAL] [0.5]
        Valid Values: 0.5 to 1.0
        Reduction factor for step size reduction for confined RK runs
    rk_stepSizeSafetyFactor [REAL] [0.9]
        Valid Values: 0.5 to 1.0
        The build in safety factor for new step size estimate

numericalTools/RungeKutta/RungeKuttaMain/Implicit
    rk_machepsAmplificationFactor [REAL] [1000.0]
        Valid Values: Unconstrained
        This x the machine epsilon value = computational epsilon value
    rk_stepSizeConfinementFactor [REAL] [0.5]
        Valid Values: 0.5 to 1.0
        Reduction factor for step size reduction for confined RK runs
    rk_stepSizeSafetyFactor [REAL] [0.9]
        Valid Values: 0.5 to 1.0
        The build in safety factor for new step size estimate