000014743 001__ 14743
000014743 005__ 20161115100200.0
000014743 04107 $$aeng
000014743 046__ $$k2016-08-21
000014743 100__ $$aOkamoto, Naoya
000014743 24500 $$aTurbulent/non-turbulent interface in magnetohydrodynamic channel flow

000014743 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014743 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014743 506__ $$arestricted
000014743 520__ $$2eng$$aDirect 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. A phenomenological theory gives an estimate of the average thickness of the ITBL as a function of R, and the estimate is in close agreement with the DNS result. Here, R is the ratio of Reynolds and Hartmann numbers.

000014743 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014743 653__ $$a

000014743 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014743 720__ $$aOkamoto, Naoya
000014743 8560_ $$ffischerc@itam.cas.cz
000014743 8564_ $$s140755$$uhttps://invenio.itam.cas.cz/record/14743/files/TS.FM14-4.06.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1439, code TS.FM14-4.06
.
000014743 962__ $$r13812
000014743 980__ $$aPAPER