Chapter 8: Using the Discrete Ordinates Radiation Model
This tutorial is divided into the following sections:
8.1. Introduction
8.2. Prerequisites
8.3. Problem Description
8.4. Setup and Solution
8.5. Summary
8.6. Further Improvements
8.1. Introduction
This tutorial illustrates the set up and solution of flow and thermal modelling of a headlamp. The discrete
ordinates (DO) radiation model will be used to model the radiation.
This tutorial demonstrates how to do the following:
• Read an existing mesh file into ANSYS FLUENT.
• Set up the DO radiation model.
• Set up material properties and boundary conditions.
• Solve for the energy and flow equations.
• Initialize and obtain a solution.
• Postprocess the resulting data.
• Understand the effect of pixels and divisions on temperature predictions and solver speed.
8.2. Prerequisites
This tutorial is written with the assumption that you have completed Introduction to Using ANSYS FLUENT:
Fluid Flow and Heat Transfer in a Mixing Elbow (p. 111), and that you are familiar with the ANSYS FLUENT nav-
igation pane and menu structure. Some steps in the setup and solution procedure will not be shown explicitly.
8.3. Problem Description
The problem to be considered is illustrated in Figure 8.1 (p. 324), showing a simple two-dimensional section
of a headlamp construction. The key components to be included are the bulb, reflector, baffle, lens, and
housing. For simplicity, the heat output will only be considered from the bulb surface rather than the filament
of the bulb. The radiant load from the bulb will cover all thermal radiation - this includes visible (light) as
well as infra-red radiation.
The ambient conditions to be considered are quiescent air at 20 C. Heat exchange between the lamp and
the surroundings will occur by conduction, convection and radiation. The rear reflector is assumed to be
well insulated and heat losses will be ignored. The purpose of the baffle is to shield the lens from direct ra-
diation. Both the reflector and baffle are made from polished metal having a low emissivity and mirror-like
finish; their combined effect should distribute the light and heat from the bulb across the lens. The lens is
made from glass and has a refractive index of 1.5.
323
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
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