### 9.15.2. Boundary Settings

You can set the amount of soot at inlet and opening boundaries using one of the following two methods.

#### 9.15.2.1. Mass Concentration and Nuclei Concentration

Specify the boundary condition data in volumetric concentrations (for example, soot in kg/m3 and soot nuclei in mol/m3).

#### 9.15.2.2. Mass Fraction and Specific Nuclei Specific Concentration

Specify the boundary condition data in specific concentrations (for example, soot in kg/kg and soot nuclei in mol/kg).

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