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Tutorial: Aeroacoustic for a Helmholtz Resonator With the
Direct Method (CAA)
Introduction
The purpose of this tutorial is to provide guidelines and recommendations for the basic
setup and solution procedure for a typical aeroacoustic application using computational
aeroacoustic (CAA) method.
In this tutorial you will learn how to:
• Mode l a Helmholtz resonator.
• Use the transient k-epsilon model and the large eddy simulation (LES) model for
aeroacoustic application.
• Set up, run, and perform postprocessing in FLUENT.
Prerequisites
This tutorial assumes that you are familiar with the user interface, basic setup and solution
procedures in FLUENT. This tutorial does not cover mechanics of using acoustics model, but
focuses on setting up the problem for Helmholtz-Resonator and solving it. It also assumes
that you have basic understanding of aeroacoustic physics.
If you have not used FLUENT before, it would be helpful to first review FLUENT 6.2 User’s
Guide and FLUENT 6.2 Tutorial Guide.
Problem Description
A Helmholtz resonator consists of a cavity in a rigid structure that communicates through a
narrow neck or slit to the outside air. The frequency of resonance is determined by the mass
of air in the neck resonating in conjunction with the compliance of the air in the cavity.
The physics behind the Helmholtz resonator is similar to wind noise applications like sun
roof buffeting.
The Helmholtz-Resonator considered is shown in Figure 1. We assume that out of the two
cavities that are present, smaller one is the resonator. The motion of the fluid takes place
because of the inlet velocity of 27.78 m/s (100 km/h). The flow separates into a highly
unsteady motion from the opening to the small cavity. This unsteady motion leads to a
pressure fluctuations. Two monitor points (Point-1 and Point-2) act as microphone points
to record the generated sound. The acoustic signal is calculated within FLUENT. The flow
exits the domain through the pressure outlet.
c
Fluent Inc. March 2, 2005 1
Aeroacoustic for a Helmholtz Resonator With the Direct Method (CAA)
Preparation
1. Copy the files steady.cas.gz and steady.dat.gz into your working directory.
2. Start the 2D double precision (2ddp) version of FLUENT.
Setup and Solution
Step 1: Grid
1. Read the initial case and data files for steady-state (steady.cas.gz and steady.dat.gz).
File −→ Read −→Case & Data...
Ignore the warning that is displayed in the FLUENT console while reading these files.
2. Keep default scale for the grid.
Grid −→Scale...
3. Display the grid and observe the locations of the two monitor points, Point-1 and
Point-2 (Figure 1).
Figure 1: Graphics Display of the Grid
4. Display and observe the contours of static pressure (Figure 2) and velocity magnitude
(Figure 3) for the initial steady-state solution.
Display −→Contours..
2
c
Fluent Inc. March 2, 2005
Aeroacoustic for a Helmholtz Resonator With the Direct Method (CAA)
Contours of Static Pressure (pascal)
FLUENT 6.2 (2d, dp, segregated, rke)
6.09e+02
5.29e+02
4.49e+02
3.69e+02
2.89e+02
2.09e+02
1.29e+02
4.87e+01
-3.14e+01
-1.11e+02
-1.91e+02
-2.72e+02
-3.52e+02
-4.32e+02
-5.12e+02
-5.92e+02
-6.72e+02
-7.52e+02
-8.32e+02
-9.12e+02
-9.92e+02
Figure 2: Contours of Static Pressure (Steady State)
Contours of Velocity Magnitude (m/s)
FLUENT 6.2 (2d, dp, segregated, rke)
3.92e+01
3.72e+01
3.53e+01
3.33e+01
3.14e+01
2.94e+01
2.74e+01
2.55e+01
2.35e+01
2.16e+01
1.96e+01
1.76e+01
1.57e+01
1.37e+01
1.18e+01
9.80e+00
7.84e+00
5.88e+00
3.92e+00
1.96e+00
0.00e+00
Figure 3: Contours of Velocity Magnitude (Steady State)
c
Fluent Inc. March 2, 2005 3
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