Riser simulation using dense discrete phase model

Tutorial: Riser Simulation Using Dense Discrete Phase Model

Introduction
The purpose of this tutorial is to demonstrate the setup of a dense discrete phase model (DDPM) with the example of 2D riser. DDPM is used for the secondary phase that has a particle size distribution. This tutorial demonstrates how to do the following: • Use Eulerian multiphase model. • Set up and use DDPM. • Solve the case using appropriate solver settings. • Postprocess the resulting data.

Prerequisites
This tutorial is written with the assumption that you have completed Tutorial 1 from ANSYS FLUENT 13.0 Tutorial Guide, and that you are familiar with the ANSYS FLUENT navigation pane and menu structure. Some steps in the setup and solution procedure will not be shown explicitly. In this tutorial, you will use the Eulerian multiphase model and discrete phase model. For details about these models, see Sections 26.5 and 25.2 for Setting Up the Eulerian Model and Steps for Using the Discrete Phase Models respectively in ANSYS FLUENT 13.0 User’s Guide. Assuming that you are using a quad core single processor machine with a clock speed of 3.80 GHz, this tutorial will take approximately 25 hours for the calculation.

Problem Description
A vertical riser has an air inlet at bottom. Particles are injected from a side at some height close to the inlet. The schematic of the setup is as shown in Figure 1.

c ANSYS, Inc. February 24, 2011

1

Tutorial: Riser Simulation Using Dense Discrete Phase Model

Figure 1: Schematic

Setup and Solution Preparation
1. Copy the files (riser.msh.gz) to your working folder. 2. Use FLUENT Launcher to start the 2DDP version of ANSYS FLUENT. For more information about FLUENT Launcher see Section 1.1.2, Starting ANSYS FLUENT Using FLUENT Launcher in ANSYS FLUENT 13.0 User’s Guide. Step 1: Mesh 1. Read the mesh file (riser.msh). File −→ Read −→Mesh... As the mesh file is read, ANSYS FLUENT will report the progress in the console. Step 2: General Settings