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首页Fluent的UDF官方案例(含代码)

Fluent的UDF官方案例(含代码)

Fluent

ANSYS

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8个官方给定的案例(含代码)：多孔介质、壁温、粘度、UDS、流化床、非均匀流动、沉降、动网格。121页内容，提供代码供参考，简单易学

Advanced User Defined Function (UDF) Tutorials

1. Position Dependent Porous Media

2. Sinusoidal Wall Temperature Variation

3. Temperature Dependent Viscosity

4. UDFs for a User Defined Scalar

5. Modeling Uniform Fluidization in a Two Dimensional Fluidized Bed

6. Calculation of Flow Uniformity

7. Modeling the Effect of Sedimentation Concentration in a Secondary

Clarifier using a UDF

8. Using a UDF to Control the Dynamic Mesh of a Flexible Oscillating

Membrane

Position Dependent Porous Media

1. Introduction

The purpose of this tutorial is to illustrate the modeling of a position dependent porous plug in a two

dimensional channel flow with the help of a user-defined function (UDF).

This tutorial demonstrates how to do the following:

• Compile the UDF.

• Use UDF for specifying the source terms.

• Postprocess the resulting data.

2. Prerequisites

This tutorial is written with the assumption that you have completed Tutorial 1 from ANSYS Fluent Tu-

torial 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.

For more details about user-defined functions (UDF) refer to the ANSYS Fluent UDF Manual.

3. Problem Description

The problem considered in this tutorial is shown schematically in Figure 1: Problem Schematic (p. 1)

Figure 1: Problem Schematic

of ANSYS, Inc. and its subsidiaries and affiliates.

The domain is divided into two fluid zones. In the fluid-2 cell zone, an X-momentum source term is in-

cluded for each cell using UDF. This source term models the effect of a porous plug on the flow in the

X-direction and is given by:

where C = 100 is a model constant.

Equation source terms are added using the DEFINE_SOURCE macro.

The finite-volume solver of ANSYS Fluent expects the source term to be linearized according to the

following convention:

where the superscript * represents the value at the previous iteration. B (called dS[eqn]} in the UDF

macro) can be coded explicitly by using currently known value of φ, and the entire S is returned by

DEFINE_SOURCE. For the simple source of X-momentum equation in this problem,

For more details, examine the source code (porous plug.c) as shown in the Appendix (p. 9).

4. Preparation

1. Copy the files (porous_plug.msh.gz and porous_plug.c) to the working folder.

2. Use Fluent Launcher to start the 2D version of ANSYS Fluent.

3. Enable Double-Precision in the Options list.

4. Click the UDF Compiler tab and ensure that the Setup Compilation Environment for UDF is enabled.

Note

The path to the .bat fie which is required to compile the UDF will be displayed as soon

as you enable Setup Compilation Environment for UDF.

If the UDF Compiler tab does not appear in the Fluent Launcher dialog box by default,

click the Show More Options button to view the additional settings.

of ANSYS, Inc. and its subsidiaries and affiliates.2

Position Dependent Porous Media

5. Setup and Solution

5.1. Mesh

• Read the mesh file (porous_plug.msh.gz).

File → Read → Mesh...

Note

As the mesh file is read, ANSYS Fluent will report the progress in the console.

Figure 2: Mesh Display

5.2. General Settings

1. Retain the default solver settings.

General

2. Check the mesh.

General → Check

Note

ANSYS Fluent will perform various checks on the mesh and will report the progress in

the console. Ensure that the reported minimum volume is a positive number.

of ANSYS, Inc. and its subsidiaries and affiliates.

Setup and Solution

5.3. Models

• Select the k-epsilon turbulence model.

Models → Viscous → Edit...

Note

You will use the default fluid properties of air for this problem. Hence, you need not

make any changes to the material properties.

5.4. Compile the UDF

Note

The UDF can be compiled as well as interpreted. In this tutorial, use the compiled option.

Compile the UDF (porous plug.c).

Define → User-Defined → Functions → Compiled...

1. Click the Add... button in the Source Files section to open the Select File dialog.

2. Select the file porous_plug.c.

3. Click Build.

Note

A Warning dialog box will appear, warning you to make sure that the UDF source files

are in the same folder that contains the case and data files. Click OK to close the

Warning dialog box.

You can view the compilation history in the log file that is saved in your working folder.

4. Click Load to load the library.

of ANSYS, Inc. and its subsidiaries and affiliates.4

Position Dependent Porous Media

剩余120页未读，继续阅读

fluent udf 官方案例 1. Position Dependent Porous Media 2. Sinusoidal Wall Temperature Variation 3. Temperature Dependent Viscosity 4. UDFs for a User Defined Scalar 5. Modeling Uniform Fluidization in a Two Dimensional Fluidized Bed 6. Calculation of Flow Uniformity

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