Study on the spatially localized disturbance in a low Reynolds number flow
Project/Area Number |
25889034
|
Research Category |
Grant-in-Aid for Research Activity Start-up
|
Allocation Type | Single-year Grants |
Research Field |
Fluid engineering
|
Research Institution | Kyoto University |
Principal Investigator |
OKINO Shinya 京都大学, 工学(系)研究科(研究院), 助教 (30711808)
|
Project Period (FY) |
2013-08-30 – 2015-03-31
|
Project Status |
Completed (Fiscal Year 2014)
|
Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
Keywords | 乱流遷移 / 定常進行波解 / 乱流パフ / 矩形ダクト |
Outline of Final Research Achievements |
An invariant object on the laminar-turbulent boundary in phase space is call the "edge state". Three edge states are obtained for the pressure-driven flow through a square straight duct, varying the streamwise period of the calculation. For a short duct, the edge state is found to be a travelling wave spanning the whole calculation domain. Expanding the streamwise period moderately, the edge state shows a chaotic behavior where the localization of the disturbances are occasionally observed. For a long duct, the edge trajectory settles down to a travelling wave solution with streamwise localized disturbances whose amplitude is very small. The localized solution with small amplitude is of importance in that it is capable of triggering the transition to turbulence.
|
Report
(3 results)
Research Products
(3 results)