UsingFLUENT’sErosionModeltoInvestigateErosionina90degreeElbowBe..docx

Tutorial: Using FLUENT’s Erosion Model to InvestigateErosion in a 90 degree Elbow BendIntroductionThe purpose of this tutorial is to demonstrate the erosion model for analyzing the erosion phenomenon due to particles impinging on a 3D elbow bend. The erosion phenomenon is quite common in many engineering applications, including rotary machines.This tutorial demostrates how to do the following:Use the erosion model to analyze erosion in a 3D elbow bend.Use the discrete phase model.Set up and solve the case with appropriate solver settings.Postprocess the resulting data.PrerequisitesThis tutorial assumes that you are familiar with the FLUENT interface and that you have a good understanding of the basic setup and solution procedures. Some of the basic steps in the setup and solution procedures will not be shown explicitly. You should be familiar with the discrete phase model. If you are not, you can refer to the FLUENT 6.3 User’s Guide.Problem DescriptionThe problem to be considered is shown in the Figure 1. The configuration consists of a pipe with two 90 degree bends. Water flow is confined in the pipe from inlet to outlet.Water enters at the inlet with 10 m/s normal velocity and the outlet is assumed to be an outflow boundary. Turbulent, isothermal, and steady state conditions will be considered to solve the flow field.Particles of density 1500 kg/m3 are released from the inlet of the pipe with an initial velocity of 10 m/s. Diameter of the particles is 200 microns and the solid mass flow rate is 1 kg/m3.The normal and tangential reflection coefficient for the wall boundary is a polynomial function of the particle impact angle. In the setup of the erosion model, the impact angle function is defined to represent ductile erosion on the wall of the pipe (i.e. particles that impact the wall at a shallow angle will cause a higher erosion rate than particles that impact the wall at higher angles).In this tutorial, the diameter function is defined at a value of 1.8e?9. The