Runtime Parameters Documentation for FLASH Release 4.2

physics/sourceTerms/Heatexchange
    useHeatexchange [BOOLEAN] CONSTANT [FALSE]


physics/sourceTerms/Heatexchange/HeatexchangeMain
    useHeatexchange [BOOLEAN] [TRUE]


physics/sourceTerms/Heatexchange/HeatexchangeMain/ConstCoulomb
    hx_coulombLog [REAL] [1.0]
        Valid Values: 0.0 to INFTY

    hx_couplingConst13 [REAL] [0.0]
        Valid Values: 0.0 to INFTY

    hx_couplingConst23 [REAL] [1.0]
        Valid Values: 0.0 to INFTY

    hx_dtFactor [REAL] [0.5]
        Valid Values: 0.0+ to INFTY

    hx_relTol [REAL] [-1.0]
        Valid Values: Unconstrained
        relative tolerance for temperature errors introduced by HeatExchange.
        This runtime parameter affects the time step computed by
        Heatexchange_computeDt. Basically, if the max (abs) temperature
        adjustment that would be introduced in any nonzero component in any cell
        is less than hx_relTol, then the time step limit is relaxed. Set to a
        negative value to inherite the value of runtime parameter eos_tolerance.

physics/sourceTerms/Heatexchange/HeatexchangeMain/Constant
    hx_couplingConst12 [REAL] [1.0]
        Valid Values: 0.0 to INFTY
        ion-electron heat exchange coupling constant
    hx_couplingConst13 [REAL] [0.0]
        Valid Values: -1.0, 0.0 to INFTY
        ion-radiation heat exchange coupling constant (usually ignored)
    hx_couplingConst23 [REAL] [1.0]
        Valid Values: -1.0, 0.0 to INFTY
        electron-radiation heat exchange coupling constant, representing
        emission and absorption effects
    hx_dtFactor [REAL] [0.5]
        Valid Values: 0.0+ to INFTY

    hx_relTol [REAL] [-1.0]
        Valid Values: Unconstrained
        relative tolerance for temperature errors introduced by HeatExchange.
        This runtime parameter affects the time step computed by
        Heatexchange_computeDt. Basically, if the max (abs) temperature
        adjustment that would be introduced in any nonzero component in any cell
        is less than hx_relTol, then the time step limit is relaxed. Set to a
        negative value to inherite the value of runtime parameter eos_tolerance.

physics/sourceTerms/Heatexchange/HeatexchangeMain/LeeMore
    hx_dtFactor [REAL] [0.5]
        Valid Values: 0.0+ to INFTY

    hx_ieTimeCoef [REAL] [1.0]
        Valid Values: 0.0 to INFTY
        Constant coefficient for scaling ion/ele coupling time
    hx_relTol [REAL] [-1.0]
        Valid Values: Unconstrained
        relative tolerance for temperature errors introduced by HeatExchange.
        This runtime parameter affects the time step computed by
        Heatexchange_computeDt. Basically, if the max (abs) temperature
        adjustment that would be introduced in any nonzero component in any cell
        is less than hx_relTol, then the time step limit is relaxed. Set to a
        negative value to inherite the value of runtime parameter eos_tolerance.

physics/sourceTerms/Heatexchange/HeatexchangeMain/Spitzer
    hx_dtFactor [REAL] [0.5]
        Valid Values: 0.0+ to INFTY

    hx_ieTimeCoef [REAL] [1.0]
        Valid Values: 0.0 to INFTY
        Constant coefficient for scaling ion/ele coupling time
    hx_relTol [REAL] [-1.0]
        Valid Values: Unconstrained
        relative tolerance for temperature errors introduced by HeatExchange.
        This runtime parameter affects the time step computed by
        Heatexchange_computeDt. Basically, if the max (abs) temperature
        adjustment that would be introduced in any nonzero component in any cell
        is less than hx_relTol, then the time step limit is relaxed. Set to a
        negative value to inherite the value of runtime parameter eos_tolerance.