Study on the correlation between the surface turbulent flows and structures of heterogeneous porous mediua

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360073
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Osaka Prefecture University
• Principal Investigator: SUGA Kazuhiko 大阪府立大学, 工学(系)研究科(研究院), 教授 (60374089)
• Co-Investigator(Kenkyū-buntansha): KANEDA Masayuki 大阪府立大学, 工学研究科, 准教授 (50346855)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 乱流 / 多孔質 / ヘテロ性 / 透過率 / 乱流モデル / 格子ボルツマン法 / PIV

Outline of Final Research Achievements

PIV measurements and numerical simulations of turbulent flows in the interface regions of heterogeneous porous media are performed. For the PIV measurements, we made porous medium of FEP resin whose refractive index is close to that of water to measure flows inside the porous media. Two dimensional turbulent boundary layers over porous media are also measured and simulated to discuss the flow physics totally. As a result, we observed that in the case that the stream-wise and span-wise permeabilities are much lower than the surface-normal one, the normal fluctuation velocity and thus the Reynolds shear stress are damped because of the blocking effects on the vortex motions penetrating inside the porous medium by the saturated fluid inside the porous medium. By the LBM simulations, we discussed the detailed behaviour of the budget terms of the double averaged turbulence equations and constructed Reynolds stress and k-e models for general porous medium flows.

Free Research Field

流体工学