Numerical study of suppressing boundary layer separation using submerged vortex generator

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420105
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Tohoku University
• Principal Investigator: Sawada Keisuke 東北大学, 工学(系)研究科(研究院), 教授 (80226068)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ボルテックスジェネレーター / 境界層埋没型 / 不連続ガレルキン法 / 非構造格子法 / 縦渦融合 / 渦核位置制御

Outline of Final Research Achievements

A discontinuous Galerkin method for unstructured mesh for solving viscous compressible flow is developed for examining flows over submerged vortex generators (SVG) which have complicated geometries. Validation of the present numerical method is accomplished by comparing the computed results with the existing wind tunnel data.Then, flows over SVGs having either vane, doublet, and wishbone geometries are closely examined.
The computed flowfield over a pair of doublet SVGs in series configuration shows that a longitudinal vortex generated at the first doublet SVG is merged with another longitudinal vortex from the second one to strengthen the overall longitudinal vortex in the downstream region. It is also shown that the vortex core of the merged vortex lifts up from the wall region when it leaves from the trailing edge of the second SVG for escaping from the highly dissipative region close to the wall surface.

Free Research Field

計算空気力学