Turbulent/non-turbulent interface in magnetohydrodynamic channel flow in an imposed magnetic field

2016 Fiscal Year Final Research Report

• Project/Area Number: 26390129
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Computational science
• Research Institution: Nagoya University
• Principal Investigator: Okamoto Naoya 名古屋大学, 工学研究科, 助教 (80547414)
• Co-Investigator(Renkei-kenkyūsha): ISHIHARA Takashi 名古屋大学, 工学研究科, 准教授 (10262495)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 乱流 / 電磁流体 / 直接数値計算

Outline of Final Research Achievements

Direct numerical simulations (DNSs) are performed to show the presence of turbulent/non-turbulent interfaces in a magnetohydrodynamic (MHD) turbulent channel flow under the influence of a wall-normal magnetic field. Visualization of the vorticity field reveals flow structures consisting of two internal turbulent boundary layers (ITBLs) growing from each wall and a non-turbulent channel core. The flow structures suggest the presence of an interface between the ITBL and the core. The conditional statistics of the DNS data shows that vorticity components have sharp gradients at the interface as observed in external hydrodynamic shear flows. The Joule dissipation rate, a characteristic quantity in MHD flow, is shown to have sharp gradients at the interface.

Free Research Field

数値流体力学