Tutorial Spray Paint

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    © 2016 ANSYS, Inc. All rights reserved Page 1 of 21 Spray Paint Modeling Using ANSYS Fluent 1. Introduction The purpose of this tutorial is to provide guidelines and recommendations for setting up and solving a spray paint case using the discrete phase model (DPM) of ANSYS Fluent . 2. Prerequisites This tutorial is written with the assumption that you have completed the T ut or  ials    Introduction to ANSYS  Fluent in ANSYS Workbench: Fluid Flow and Heat Transfer in Mixing Flow , and  Modeling  Evaporating Liquid Spray  from ANSYS Fluent T u torial G uide,  and that you are familiar with the ANSYS Fluent navigation pane and menu struc tur  e .   S ome steps in the setup and solution  procedure will not be shown explicitly. In this tutorial, you will use the standard k- ε   turbulence model and the discrete phase model. If you have not used these models before, it would be helpful to first refer to chapters  Modeling Turbulence  and  Modeling Discrete  Phase   from ANSYS Fluent User’s Guide.  3. Problem D escription   Water is injected onto a cylinder to form a wall-film on the cylinder  . 4. P r epara tion   1.   Copy the mesh file spray_paint.msh.gz  to your working directory. 2.   Start the 3D double precision version of ANSYS Fluent.  For more information about Fluent Launcher see Section  Starting ANSYS Fluent Using Fluent Launcher   from  ANSYS Fluent User’s Guide.   5.   Initial Setup and Solution You will setup and run this case without DPM first. Step 1: Grid   1.1 . Read the grid file  File → Read → Mesh  Select the file spray_paint.msh.gz  from the Files  list and then click on OK  . 1.2 . Check the mesh Setup → General    → Check Click on Check   under  Mesh  (Figure 2) .    Spray Paint Modeling Using ANSYS Fluent © 2016 ANSYS, Inc. All rights reserved Page 2 of 21 Fluent will perform various checks on the mesh and will report the progress in the console. Make sure that the minimum volume reported is a positive number  . 1.3 . Display the mesh (Figure 3) Setup → General →  Display Figure 3. Mesh   Figure 2. General panel    Spray Paint Modeling Using ANSYS Fluent © 2016 ANSYS, Inc. All rights reserved Page 3 of 21 Step 2: Materials   2.1. Define the materials. Setup → Materials...   Keep the default air   material. Step 3: Models   3.1. Select Pressure Based solver. Setup → General→ Solver    Select  Pressure-Based    under Type , Transient   under Time ( Figure 3).   3.2. Enable Energy equation. Setup → Models→  Energy 3.3. Specify Turbulence model. This   tutorial will be solved by using S tandard κ  - ε  model. Setup → Models→ Viscous   Select k-epsilon (2 eqn)  under Model  and   Standard under   k-epsilon Model  list, keep the default settings (Figure 4). Step 4: Operating Conditions Setup →  Boundary Conditions → Operating Conditions  Keep 101325 Pa for Operating Pressure,  enable Gravity  and enter the 9.81 m/s2 in z-direction, 288.16 K as Operating Temperature , as shown in Figure 5 below. Step 5: Boundary Conditions   Setup →  Boundary Conditions... Keep the default values under the momentum and thermal tabs for the boundary  and wall   boundary zones. Step 6: Solution Methods/Controls   6.1. Set the Solution Methods   Sol  ution →  Solution Methods.. .   Keep the default solution methods: you will use SIMPLE, LSQ gradients, 2 nd  order for pressure, momentum and energy, and first order for turbulence.   6.2. Set the Solution Controls   Sol  ution →  Solution Controls Keep the default solution controls.  Spray Paint Modeling Using ANSYS Fluent © 2016 ANSYS, Inc. All rights reserved Page 4 of 21 Figure 5. Operating Conditions panel   Figure 4. Turbulence model settings   Step 7: Initialization of the Solution   7.1. Initialize the solution Solution →  Solution Initialization... Use the Standard Initialization with the default values.   Step 8: Iterate   8.1 . Run calculation Solution →  Run Calculation... Enter 0.001 for the Time Step Size, 10 for the number of iterations, and 50 for the Max Number of Iterations/Time Step. Click on Calculate , Figure 6. 8.2. Save the case and data files with the name spray_paint_ini.gz    File →  Write →  Case&Data...
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