Surface-Gas Interaction Model Reference

Table 1. Surface-Gas Interaction Model Reference
Theory	See Surface Chemistry.
Provided By	[physics continuum] > Models > Surface Chemistry Reaction
Example Node Path	Continua > Physics 1 > Models > Surface-Gas Interaction
Requires	One of the following combinations:
	Material: Multi-Component Gas Flow: any Reaction Regime: Reacting Reacting Flow Models: Reacting Species Transport Reacting Species Models: Eddy Break-Up Flow: any Optional Models: Surface Chemistry	Material: Multi-Component Gas Reaction Regime: Non-Reacting Flow: any Optional Models: Surface Chemistry
Properties	See Surface-Gas Interaction Model Properties.
Specific Right-Click Actions	See Right-Click Actions.
Region Inputs	See Region InputsRegion Inputs.

Surface-Gas Interaction Model Properties

Source Enabled Trigger: Controls whether Simcenter STAR-CCM+ starts calculating the chemistry at the time-step, iteration, or physical time that you specify in the Begin property, or whether this model never contributes any sources.
Begin: Specifies the iteration, time-step, or physical time after which the reactions are activated. Before this iteration, time-step, or physical time, reactions are deactivated. Specifying a physical time [degCA] allows you to activate chemistry sources just before spark ignition. When specifying it as an expression which varies during the simulation, reactions are only active when the current iteration, time-step, or physical time is higher than the value provided by the expression.
Verbose on Error: Provides details about solver errors.; Activated: During iterations, this option generates maximum details in the Output window about solver errors.; Deactivated: Uses standard iteration output.
Absolute Tolerance: Absolute tolerance for the CVODE ODE solver.
Relative Tolerance: Relative tolerance for the CVODE ODE solver.

Right-Click Actions

Import Chemistry Definition (Chemkin format): Activates a standard Open dialog that imports files for the chemistry definition in Chemkin™ format. Upon importing a chemistry definition, the reactions for the definition appear as sub-nodes of the Chemistry Definition node.; If you import transport data along with the chemical mechanism and thermal data, Simcenter STAR-CCM+ tabulates the molecular transport properties for the Dynamic Viscosity, Molecular Diffusivity, and Thermal Conductivity material properties. You can then choose to use these tabulated molecular transport properties after table generation, in the Multi-Component Gas node, by selecting the Flamelet Table option for each of the Material Properties.
Delete Chemistry Definition: Removes all the species and their reactions in the chemistry definition.

Region Inputs

Porous

Enable Reaction-Diffusion Flux Limiting

Accounts for situations where the diffusion flux is small relative to reaction, reactants/products diffuse slowly to/from the surface, and the reaction rate is limited by the diffusion rate. Available when a surface mechanism is specified for the porous region.

Enable Reaction-Diffusion Flux Limiting Option	Corresponding Physics Value Nodes
When activated, limits the reaction rate based on the rate of diffusion of individual species to the porous surface.	Reaction-Diffusion Flux Multiplier Specifies the scaling factor $F$ in Eqn. (3601).