### 9.10.3. Boundary Settings

For the residual material model the following additional options are available for Mixture boundary conditions:

- Mixture Fraction and Fuel Tracer: Use this parameter for direct specification of boundary values for the mean mixture fraction and fuel tracer.

- Mixture Fraction and Residual Material: Specification of the residual material mass fraction and the conditional mixture fractions for the fresh and residual fractions.

- Equivalence Ratio and Residual Material: Specification of the residual material mass fraction and the conditional equivalence ratios for the fresh and residual fractions.

For options other than the above, the fuel tracer is set equal to mixture fraction, which corresponds to no residual material present in the inlet stream.

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