Reply To: User Defined Function for erosion modelling

[Rob]

Have a look at the accretion example,   https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v242/en/flu_udf/flu_udf_DPMDEFINE.html%23flu_udf_sec_define_dpm_erosion   Impact effect is a function of speed, impact angle, material properties and impact facet area. Cell concentration isn't overly useful, as a particle in the near wall cell may not always hit the wall. 

Note, as you're likely using facet area over surface/zone area you may want to exercise caution regarding cell size uniformity and parcel count.