This tutorial gives you a basic insight for Transient Analysis in Ansys

1. By Rahul Shedage
M.Tech. Mechanical Design
Transient Thermal Analysis of a Clutch Plate
In this tutorial, an existing finite element model of a clutch plate will be used to demonstrate how to set up
and perform a transient thermal analysis. Transient thermal analyses can be performed using the ANSYS or
Samcef solver.
The following exercises are included:
• Introduction
• Setting Project page
• Define engineering data
• Retrieving the Ansys geometry input file
• Creating mesh model
• Applying Loads and Boundary Conditions to the Model
• Solving the model
• Adding results to solution
• Viewing the results
The following file is needed to perform this tutorial: Geometry_clutch.agdb
Exercise:
1. Introduction:
Transient thermal analyses determine temperatures and other thermal quantities that vary over time. The
variation of temperature distribution over time is of interest in many applications such as with cooling of
electronic packages or a quenching analysis for heat treatment requested.
In this tutorial we are going to study the temperature distribution on a Clutch Plate. Heat is generated in clutch
plate due to friction between friction lining and flywheel.
A transient thermal analysis can be either linear or nonlinear. Temperature dependent material properties
(thermal conductivity, specific heat or density), or temperature dependent convection coefficients or radiation
effects can result in nonlinear analyses that require an iterative procedure to achieve accurate solutions.
The thermal properties of most materials do vary with temperature, so the analysis usually is nonlinear.
2. Setting Project page:
1. Open the Project page.
2. From the Units menu verify:
– Project units are set to “Metric (kg, mm, s, C, mA, mV).
– “Display Values in Project Units” is checked (on).

2. By Rahul Shedage
M.Tech. Mechanical Design
3. From the Toolbox insert a “Transient Thermal” system into the Project Schematic.
3. Define Engineering Data
On Define Engineering Data Thermal Conductivity must be defined for a steady-state thermal analysis. Thermal
Conductivity can be isotropic or orthotropic, and constant or temperature dependent. There are several
material in the Engineering Data Sources that we can use directly. By clicking the Engineering Data Sources,
then Thermal Material, then clicking the plus near Aluminium.

3. By Rahul Shedage
M.Tech. Mechanical Design
4. Retrieving the Ansys geometry input file
1. From the Geometry cell, RMB and “Import Geometry > Browse”. Import the file
“Geometry_clutch.agdb”. (RMB: Right Mouse Button)
2. Double click the “Model” cell to start the Mechanical application

4. By Rahul Shedage
M.Tech. Mechanical Design
3. Set the working unit system: “Units > Metric (mm, kg, N, s, mV, mA)”.
4. Creating Mesh Model:
1. Highlight the mesh branch, “RMB > Insert > Method”.

5. By Rahul Shedage
M.Tech. Mechanical Design
2. In Geometry lable select the solid body from the working area,
3. Define Mehod > Quadrilateral Dominent
4. Automatic Method > RMB > Inflate This Method
5. Then click on Boundary > Select six edges of the plate.

6. By Rahul Shedage
M.Tech. Mechanical Design
6. Change the Global Mesh Controls as shown bellow Figure,
7. Review the meshed model

7. By Rahul Shedage
M.Tech. Mechanical Design
5. Apply Loads and BCS
1. The properties of the geometry are usually defined as Structure Steel, we can select several
components and change them to Aluminium, which was added in previous step. Click on Geometry >
Friction Disc > Material > Assignment > Change material to Aluminium
2. Highlight the “Transient Thermal” branch.
LMB > Analysis Settings”.
In tabular data input the values of time as,

8. By Rahul Shedage
M.Tech. Mechanical Design
3. Then add Convection to the plate as
Transient Thermal > RMB > Insert Convection (In geometry select inner surface of the plate)
Definition > Drop down arrow LMB > Import Temperature Independent > Stagnation Air- Simplified Case > OK
4. Then add Temperature to the plate as
Transient Thermal > RMB > Insert > Temperature (In geometry select outer surface of the plate)
In Magnitude Select Tabular Chart and enter values as bellow,
6. Solve the System:
Solution > RMB > Solve
7. Adding Results to Solution:
1. Highlight the solution branch:
2. From the context menu, choose Thermal >Temperature or RMB > Insert > Thermal >Temperature
Repeat the step above, choose Thermal > Total Heat Flux

9. By Rahul Shedage
M.Tech. Mechanical Design
3. Solve again.
Note: adding results and resolving the model will not cause a complete solution to take place. Results
are stored in the database and requesting results requires only an update.
8. Viewing the Results
.1. Click on Temperature from solution tab,
2. Click on Total Heat Flus from Solution,

10. By Rahul Shedage
M.Tech. Mechanical Design
The maximum Heat Flux is 0.28569W/mm2