Transient Heat Transfer Analysis in Abaqus: Step-by-Step Tutorial

Transient heat transfer analysis is one of the most important simulation capabilities in Abaqus, allowing engineers to predict temperature distribution, heat flow, and thermal gradients in engineering components. Accurate thermal simulations are essential for designing welded structures, electronic devices, heat exchangers, additive manufacturing parts, and many other industrial applications.

In this tutorial, you’ll learn how to build a complete thermal model in Abaqus (from material definition to post-processing) using a simple aluminum and resin assembly.

1. Introduction

Heat transfer influences structural performance, residual stress, thermal expansion, fatigue life, and material degradation. Abaqus provides both steady-state and transient thermal analyses that accurately simulate conduction, convection, and radiation.

This tutorial focuses on a transient heat transfer analysis using two different materials:

• Aluminum
• Resin

2. Problem Description

The objective is to determine the temperature distribution inside a two-material component subjected to:

• External heat flux
• Convective cooling
• Initial ambient temperature

The simulation demonstrates how heat flows through materials having significantly different thermal conductivities.

3. Step-by-Step Tutorial for Transient Heat Transfer Analysis

Step-1: Create the Geometry

Create two solid bodies representing:

• Aluminum component
• Resin component

We uses an extrusion depth of 20 mm.

Recommended workflow:

• Part Module
• Create 2D sketch
• Extrude to 20 mm
• Create separate parts

Step-2 : Define Material Properties

Engineering Note;

Notice the huge difference in thermal conductivity:

• Aluminum: 202 W/m·K
• Resin: 1 W/m·K

This causes heat to travel much faster through aluminum than through resin, resulting in significant temperature gradients at the interface.

Step-3 : Create Sections and Assign Materials

Assign:

• Aluminum section
• Resin section

Verify every region receives the correct material before proceeding.

Step-4 : Assemble the Model

Create instances of all parts in the Assembly Module.

Use dependent instances unless independent editing is required.

Step-5 : Create the Heat Transfer Step

Create a new analysis step:

Heat Transfer → Transient

Choose appropriate time increments according to the heating duration.

Transient analysis is recommended whenever temperature changes with time.

Step-6 : Define Contact

If the two parts touch each other:

• Create Contact Interaction
• Define Thermal Conductance
• Ensure heat can transfer between contacting surfaces

Without proper thermal contact, heat cannot flow correctly across interfaces.

Step-7 : Apply Initial Temperature

Use:

Predefined Field → Temperature

Specify the initial ambient temperature for the entire model.

Example:

20°C

or

293 K

depending on your unit system.

Step-8 : Apply Convection

Create a film condition.

Specify:

• Film coefficient
• Sink temperature (ambient temperature)

Convection represents cooling caused by air or surrounding fluid.

Typical applications include:

• Natural air cooling
• Forced convection
• Cooling channels
• Outdoor structures

Step-9 : Apply Heat Flux

Apply a surface heat flux to the heated region.

Examples include:

• Laser heating
• Welding
• Electronic components
• Induction heating
• Furnaces

The heat flux determines how much thermal energy enters the model.

Step-10 : Define Amplitude

Instead of applying heat instantly, create an Amplitude curve.

Examples:

• Linear ramp
• Step loading
• Cyclic heating
• User-defined profile

Amplitude improves numerical stability and accurately represents real heating processes.

Step-11 : Mesh the Model

Generate the finite element mesh. ( Click here to see how to create 3D mesh in Abaqus )

Recommendations:

• Use finer elements near the heat source.
• Refine the mesh around interfaces.
• Use second-order thermal elements when higher accuracy is required.

A good mesh captures steep temperature gradients efficiently.

Step-12 : Submit the Job

Create a new Job.

Check:

• Material assignments
• Step settings
• Boundary conditions
• Mesh quality
• Contact definitions

Run the analysis and monitor for warnings or errors.

Step-13 : Post-Processing

After completion, open the Visualization Module.

Review:

• Temperature contours
• Temperature history
• Heat flux vectors
• Thermal gradients
• Maximum and minimum temperatures

Compare the temperature response between aluminum and resin.

Because aluminum has much higher thermal conductivity, it distributes heat rapidly, while the resin remains comparatively insulated.

4. Common Errors in Transient Heat Transfer Analysis in Abaqus

Many beginners encounter the following issues:

• Missing thermal conductivity
• Incorrect unit system
• No initial temperature
• Missing thermal contact
• Incorrect convection definition
• Applying heat to the wrong surface
• Poor mesh quality
• Unrealistic material properties

Carefully reviewing each setup step can prevent inaccurate results.

5. Industrial Applications of Thermal analysis in Abaqus

Thermal analysis in Abaqus is widely used for:

• Laser welding simulation
• Additive manufacturing
• Electronics cooling
• Heat exchanger design
• Composite curing
• Battery thermal management
• Aerospace thermal protection
• Injection molding
• Casting simulation
• Thermal stress prediction

Read more about Finite Element Solutions of Heat Conduction Problems

Or Finite Element Analysis (FEA) of the Heat Equation

7. Conclusion

Thermal simulations are essential for predicting heat transfer and temperature evolution in engineering components. By correctly defining material properties, thermal contacts, convection, heat flux, and mesh refinement, Abaqus enables engineers to solve complex thermal problems with confidence.

Mastering these fundamentals provides the foundation for more advanced analyses such as thermo-mechanical coupling, welding simulation, additive manufacturing, and residual stress prediction.