Interphase mass transfer of a reaction
 

i am trying to make interphase mass transfer achieve a decomposition reaction.
1.set up reaction:
REACTION: Reaction 1
Option = Single Step
COMBUSTION MODEL:
Chemical Timescale = 1.37E-4 [s]
Option = Finite Rate Chemistry
END
FORWARD REACTION RATE:
Option = Expression
Reaction Rate = HydrateRate
END
PRODUCTS:
Materials List = CH4,Water
Option = Child Materials
CHILD MATERIAL: CH4
Option = Stoichiometric
Stoichiometric Coefficient = 1.0
END
CHILD MATERIAL: Water
Option = Stoichiometric
Stoichiometric Coefficient = 6
END
END
REACTANTS:
Materials List = hydrate
Option = Child Materials
CHILD MATERIAL: hydrate
Option = Stoichiometric
Stoichiometric Coefficient = 1.0
END
END
END
END
2.set up reaction energy:
BULK SOURCES:
Option = Use Volume Fraction
EQUATION SOURCE: energy
Multiply by Porosity = Off
Option = Source
Source = HeatSource
END
END
3.set up interphase mass transfer:
FLUID PAIR: Gas | Hydrate
INTERPHASE HEAT TRANSFER:
Heat Transfer Coefficient = 5 [W m^-2 K^-1]
Option = Heat Transfer Coefficient
END
INTERPHASE TRANSFER MODEL:
Option = Particle Model
END
MASS TRANSFER:
Option = Specified Mass Transfer
SPECIFIED MASS TRANSFER:
Fluid1to2 Mass Flux = GasMassFlow
Option = Interfacial Mass Flux
END
END
MOMENTUM TRANSFER:
DRAG FORCE:
Drag Coefficient = 4
Option = Drag Coefficient
END
LIFT FORCE:
Option = None
END
VIRTUAL MASS FORCE:
Option = None
END
WALL LUBRICATION FORCE:
Lubrication Coefficient C1 = -0.01
Lubrication Coefficient C2 = 0.05
Option = Antal
END
END
END
FLUID PAIR: Gas | Water
INTERPHASE HEAT TRANSFER:
Heat Transfer Coefficient = 0.6 [W m^-2 K^-1]
Option = Heat Transfer Coefficient
END
INTERPHASE TRANSFER MODEL:
Interface Length Scale = 1. [mm]
Option = Mixture Model
END
MASS TRANSFER:
Option = None
END
MOMENTUM TRANSFER:
DRAG FORCE:
Drag Coefficient = 4
Option = Drag Coefficient
END
END
END
FLUID PAIR: Hydrate | Water
INTERPHASE HEAT TRANSFER:
Heat Transfer Coefficient = 50 [W m^-2 K^-1]
Option = Heat Transfer Coefficient
END
INTERPHASE TRANSFER MODEL:
Option = Particle Model
END
MASS TRANSFER:
Option = Specified Mass Transfer
SPECIFIED MASS TRANSFER:
Fluid1to2 Mass Flux = WaterMassFlow
Option = Interfacial Mass Flux
END
END
MOMENTUM TRANSFER:
DRAG FORCE:
Drag Coefficient = 4
Option = Drag Coefficient
END
LIFT FORCE:
Option = None
END
VIRTUAL MASS FORCE:
Option = None
END
WALL LUBRICATION FORCE:
Option = None
END
END
END
4.error:
ERROR #001100279 has occurred in subroutine ErrAction.
Message:
Floating point exception: Multiple faults


| ERROR #001100279 has occurred in subroutine ErrAction.
| Message:
| Stopped in routine FPX: C_FPX_HANDLER

Thanks for anyone who gives me a view.