CFD Review  
Serving the CFD Community with News, Articles, and Discussion
 
CFD Review

User Preferences
Site Sponsorship
Headline Feeds
Mobile Edition
Privacy Policy
Terms of Service
twitter

Submit a CFD Story

Site Sponsors
CD-adapco
Pointwise: Reliable CFD meshing
ANSYS

Tell a Friend
Help this site to grow by sending a friend an invitation to visit this site.

CFD News by Email
Did you know that you can get today's CFD Review headlines mailed to your inbox? Just log in and select Email Headlines Each Night on your User Preferences page.

 
CD-adapco First in Aeroacoustics with Structural Impedance
Posted Fri July 16, 2010 @03:11PM
Print version Email story Tweet story
CD-adapco The reduction of aerodynamic noise has long been a design concern throughout the automotive, rail and aerospace industries. Exposure to extraneous noise generated by acoustically non-optimal designs not only detracts from ride enjoyment, but also contributes significantly to driver fatigue.

CD-adapco, the world’s leading supplier of engineering simulation solutions to the automotive industry, has demonstrated a first in fluid-structures integrated capability for aeroacoustics simulations with structural impedance effects.


Sponsor CFD Review

CD-adapco is collaborating with the Aeroacoustics Working Group of German automotive manufacturers, which has issued the following statement:

“The consortium of the German automotive manufacturers Audi, BMW, Daimler, Porsche and Volkswagen, that cooperates for improved numerical aeroacoustic tools, considers the results of the structural impedance effects using the coupled Finite Volume flow and stress analysis to be a well conceived and practical solution and encourages CD-adapco to continue validation against the performance data which has been made available in this project.”

CD-adapco's flagship software, STAR-CCM+, is unique in its ability to perform fully coupled fluid-solid interaction. It uses a finite volume solid stress solver implicitly integrated with the finite volume flow solver to analyze the acoustical damping effects of flexible materials.

A particularly pernicious source of noise is that associated with sunroof (or side-window) buffeting, which is caused by unsteady flow over the sunroof opening interacting with the roof panel, and radiating sound to the vehicle occupants. STAR-CCM+ has been extensively compared with sunroof buffeting measurements on the industry standard SAE-body, modified to include a sunroof cavity with different roof materials – including Aluminum, Perspex and Plywood. The simulations correctly predicted that the noise level which the driver hears can be reduced by to 10dB (decibels) at the peak frequency, illustrating how the flexibility of the roof panel is able to absorb acoustical energy to quiet the passenger experience.

velocity contours
Snap shot of the Velocity Field

The simulation results showed how the flow becomes unsteady behind the leading edge of the sunroof opening, creating a vortex which travels downstream and impacts the rear roof panel behind the sunroof opening. One way to design against this phenomenon is to add deflectors to change the flow pattern over the opening, often by introducing additional mechanical parts. By changing the acoustic properties of the car panels, similar noise reductions can be achieved.

By working closely with car manufacturers, CD-adapco provides validated tools to predict and design against wind-induced noise early in the design process, resulting in more refined vehicles that are more comfortable and ultimately safer to drive.

[ Post Comment ]

Flow Science Announces Release of FLOW-3D ThermoSET | OpenFOAM Introductory and Advanced Courses Offered  >

 

 
CFD Review Login
User name:

Password:

Create an Account

Related Links
  • ANSYS CFX
  • CD-adapco
  • CFDRC
  • Exa
  • Fidap
  • Fluent
  • Numeca
  • More on CD-adapco
  • Also by nwyman
  • 'CD-adapco First in Aeroacoustics with Structural Impedance' | Login/Create an Account | Search Discussion

    The following comments are owned by whoever posted them.
    We are not responsible for them in any way.

    Pascal Users: The Pascal system will be replaced next Tuesday by Cobol. Please modify your programs accordingly. All content except comments
    ©2014, Viable Computing.

    [ home | submit story | search | polls | faq | preferences | privacy | terms of service | rss  ]