23.4.2 Setting Particle Erosion and Accretion Parameters

If the Erosion/Accretion option is selected in the Discrete Phase Model dialog box, the erosion rate expression must be specified at the walls. The erosion rate is defined in this equation in the separate Theory Guide as a product of the mass flux and specified functions for the particle diameter, impact angle, and velocity exponent. Under Erosion Model in the Wall dialog box, you can define a constant, polynomial, piecewise-linear, or piecewise-polynomial function for the Impact Angle Function, Diameter Function, and Velocity Exponent Function ( $f(\alpha)$, $C(d_p)$, and $b(v)$ in this equation in the separate Theory Guide). See this section in the separate Theory Guide and Section  23.2.5 for a detailed description of these functions and Section  8.2 for details about using the dialog boxes for defining polynomial, piecewise-linear, and piecewise-polynomial functions.