Development of theoretical control methods for aerodynamic drag reduction

2017 Fiscal Year Final Research Report

• Project/Area Number: 25420129
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Keio University
• Principal Investigator: Fukagata Koji 慶應義塾大学, 理工学部(矢上), 教授 (80361517)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 流れの制御 / 空力抵抗 / 制御理論 / 数値シミュレーション

Outline of Final Research Achievements

The purpose of this research is to establish basic theory on the control of friction drag of wall turbulence and a flow around general object in order to further reduce aerodynamic drag of cars and trucks. Regarding the reduction of the friction drag of the wall turbulence, we verified the effect of various effects to overcome toward practical application of uniform blowing and suction and traveling wave-like wall deformation by numerical simulation, and also conducted mode analysis in wavelength space. In order to reduce the aerodynamic drag acting on an object of an arbitrary shape, we first mathematically derived the relationship between pressure drag, friction drag, energy dissipation and the physical quantities in the flow field. Subsequently, we proposed a control method based on the derived relationship and verified it in the flows around a circular cylinder, a square cylinder, and an arbitrarily shaped object.

Free Research Field

流体工学