Study of the dynamic stability derivative evaluation of the aircraft by the time and space spectrum method CFD

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14248
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Aerospace engineering
• Research Institution: Yokohama National University
• Principal Investigator: Miyaji Koji 横浜国立大学, 大学院工学研究院, 准教授 (60313467)
• Co-Investigator(Renkei-kenkyūsha): MARU Yusuke 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 助教 (20524101)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 数値流体力学 / 非定常流れ / 航空機力学 / 動安定微係数 / フーリエスペクトル法

Outline of Final Research Achievements

A time-spectral, or reduced-frequency method for the CFD is developed in place of a time-marching method for simulations of periodically unsteady flows around oscillating bodies. The efficiencies and accuracies of the method are first validated through comparisons with a transonic-flow experiment for a three-dimensional wing. For the case of viscous flow, the computation time to obtain the same periodic flow as a time-marching solution by a sufficiently fine time step was about 1/20 in the time-spectral method. The method is then applied to evaluate dynamic stability derivatives of complete aircrafts. Dependency of the stability derivatives on the flow Mach number is qualitatively shown through the comparison with experiments.

Free Research Field

空気力学，数値流体力学