Ansys

Chapter 4: Use of Parameterization to Optimize Fan Location
4.1. Introduction
The purpose of this tutorial is to demonstrate the following ANSYS Icepak features with the help of a small system level model.
In this tutorial you will learn how to:
• Use network blocks as one way of modeling packages.
• Specify contact resistance using side specifications of a block object.
• Define a variable as a parameter and solve the parametric trials.
• Specify fan curves.
• Use local coordinate systems.
• Generate a summary report for multiple solutions.

4.2. Prerequisites
This tutorial assumes that you have little experience with ANSYS Icepak, but that you are generally familiar with the interface. If you are not, please review Sample Session in the Icepak User's Guide and the tutorial Finned Heat Sink of this guide as some of the steps that were discussed in these tutorials will not be repeated here.

4.3. Problem Description
The system level model consists of a series of IC chips on a PCB. A fan is used for forced convection cooling of the power dissipating devices. A bonded fin extruded heat sink with eight 0.008 m thick fins is attached to the IC chips. The fan flow rate is defined by a nonlinear fan curve. The system also consists of a perforated thin grille. A study is carried out for the optimum location of the fan by using the parameterization feature in ANSYS Icepak.

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Use of Parameterization to Optimize Fan Location
Figure 4.1: Schematic of the Geometry

4.4. Step 1: Create a New Project
1. Start ANSYS Icepak, as described in Starting ANSYS Icepak in the Icepak User's Guide.
When ANSYS Icepak starts, the Welcome to Icepak panel opens automatically.
2. Click New in the Welcome to Icepak panel to start a new ANSYS Icepak project.
3. Specify a name for your project (i.e.,