HEAT TRANSFER

Training Manual

Inventory Number: 001445First Edition

ANSYS Release: 5.7Published Date: March 15, 2001

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Copyright © 2001 SAS IP, Inc.

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Training ManualHEAT TRANSFER

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1. Introduction 1-1A. Overview 1-3B. Related Seminars/Training 1-10C. Other Sources of Information 1-11

2. Fundamental Concepts 2-1A. Heat Transfer Basics 2-2B. The Finite Element Approach 2-11C. Error Estimation 2-16D. Beyond Linear Static 2-21E. Element Library 2-24

3. Steady State Heat Transfer (no mass transport) 3-1

A. Definitions 3-2B. Thermal Loads and Boundary Conditions 3-4C. Thermal Analysis Template 3-10D. Steady State Heat Transfer Example 3-15

4. Additional Considerations forNonlinear Analysis 4-1

A. Preprocessing Considerations 4-2B. Loading and Solution 4-5C. Solution Technique and

Convergence 4-15D. Time Considerations 4-28E. Starting Temperature and

Convergence 4-39F. Output Controls and

Postprocessing 4-43

5. Transient Analysis 5-1A. Definitions and Preprocessing 5-2B. “Time” and Solution Procedure 5-6C. Initial Conditions 5-18D. Time Integration and Loading 5-24E. Postprocessing 5-30

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6. Complex, Time and SpatiallyVarying Boundary Conditions 6-1

A. Tabular Boundary Conditions 6-2B. Primary Variables 6-8C. FLUID116 and SURF15x

Special Considerations 6-9D. Defining and Checking Tables

Using APDL 6-10

E. Examples 6-32

F. Time Step Control 6-41

G. Output Control 6-45

H. Function Tool 6-49

7. Additional Convection/Heat FluxLoading Options and SimpleThermal/Flow Elements 7-1

A. Surface Effect Elements 7-3B. Convection Links 7-

13C. Contact Resistance 7-

15D. 1-D Thermal Flow with FLUID116 7-

20E. Interfacing With Surface Effect

Elements (FLUID116) 7-31

F. Example With Mass Transport 7-35

8. Radiation Heat TransferA. Overview 8-2B. General Characteristics 8-3C. ANSYS and Radiation 8-13D. Form Factors 8-15E. Modeling Radiation in ANSYS 8-20F. Using Surface Effect Elements 8-21G. Using Link Elements 8-26H. Radiation Matrix Utility (AUX12) 8-28I. Radiosity Solver Method 8-44J. Example 8-57

9. Phase Change Analysis 9-1A. Terminology and Applications 9-2B. Latent Heat and Enthalpy 9-5C. Solving Phase Change Analyses 9-11D. Postprocessing 9-13E. Example 9-14

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10. Coupled Field Analysis 10-1A. What is Coupled Field Analysis? 10-2B. The Direct Method 10-4C. The Sequential Method 10-8D. Physics Environments 10-12E. Thermal Stress Analysis 10-15F. Detailed Procedure 10-19

11. Thermal Contact 11-1A. Key Features 11-4B. Example Problem 11-11

Appendix AThe Finite Element ApproachTo Thermal Analysis A-1A. Governing Equations and Theory A-2B. Dimensional Analysis A-8C. Example, Derivation of 3-Noded

Triangle Element A-9

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