Development of shape-topology optimization method for air duct layout (Part 1: Survey on two-dimensional design problems) : Tohru Komoriya (Subaru Research Center Co., Ltd.)
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 134 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0389-4304
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✦ Synopsis
Wind noise emitted from around the A-pillar of a production vehicle was predicted. Flow fields were calculated by solving an unsteady three-dimensional Navier-Stokes equation using a third-order upwind finite difference method with an overlaid grid system. The sources of aeroacoustic noise on the vehicle body surface were then calculated on the basis of the distribution of pressure fluctuation. By observing the distribution of the aeroacoustic noise sources and oil flow pattern on the surface, it was found that several peaks of frequency exist on the A-pillar and broad band noise sources are observed in a closed separation region.
9636862 Transient Aerodynamic Simulation in Crosswind. Kenji Okumura, Toshihiko Kuriyama (Dathatsu Motor Co., Ltd.) In this paper, transient aerodynamic simulation by using a sliding mesh of discontinuous interface and the Arbitrary Lagrangian-Eulerian method is presented. This method uses the k-e turbulence model and the third-order upwind scheme, which is introduced to the convective term of Navier-Stokes Equation to improve flow field and pressure distribution. Computed Yaw characteristics in crosswind are in good agreement with the experiments. Furthermore we have simulated the effect of an Active Spoiler on a One-Box automobile in crosswind.