Effect of Near Wall Modeling Approaches on Solid Particle Erosion Prediction

Computational Fluid Dynamics (CFD) based erosion prediction procedures are carried out to predict erosion for a submerged liquid jet impingement geometry. 2-D axisymmetric modeling with different near wall treatments are employed to model the wall bounded turbulent jet flow. Discrete Phase Model (DPM) is applied to track particles and obtain particle impact characteristics. Erosion is calculated using a typical Finnie-Bitter model [1]. In this paper, two categories of near wall modeling approaches (wall functions and near wall models) are presented and examined. Erosion prediction results for 300 μm large particles and 25 μm small particles are compared with experimental data to evaluate different near wall models with application to erosion prediction. Near wall trajectories are extracted to explain prediction results and reveal particle near wall behaviors. It is shown that appropriate selection of meshes and near wall models is capable of yielding good erosion prediction regardless of particle size.