Computation of aerodynamic noise emitted from a door mirror of a passenger car and its synthesis

Ryutaro Himeno, Tatsuya Fukushima, Kenji Ono

Research output: Contribution to journalArticle

Abstract

The aerodynamic noise caused by an outside door mirror of a passenger car was calculated and synthesized. Flows around the car including the mirror were computed using a finite-difference method and an overlapping grid technique. Sound pressure of the aerodynamic noise in far field from the car was computed with Curie's formula using unsteady pressure distribution on the mirror which is numerically solved from the incompressible Navier-Stokes equations. The sound is then synthesized for engineers to evaluate. We investigate the relation between noise sources and the flow field, and find that the strong noise sources are distributed along sepalation lines. This means it possible to reduce the noise if we can avoid separation or fix sepalation lines. Considering it, we modified the mirror shape and succeeded to reduce the aerodynamic noise.

Original languageEnglish
Pages (from-to)167-173
Number of pages7
JournalAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Volume242
Publication statusPublished - Dec 1 1996
Externally publishedYes

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Passenger cars
Aerodynamics
Mirrors
Railroad cars
Acoustic waves
Acoustic noise
Finite difference method
Pressure distribution
Navier Stokes equations
Flow fields
Engineers

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Computation of aerodynamic noise emitted from a door mirror of a passenger car and its synthesis. / Himeno, Ryutaro; Fukushima, Tatsuya; Ono, Kenji.

In: American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, Vol. 242, 01.12.1996, p. 167-173.

Research output: Contribution to journalArticle

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