Journal article

Skin-friction critical points in wall-bounded flows

Jose I Cardesa, Jason P Monty, Julio Soria, Min S Chong, J Jimenez (ed.)

1ST MULTIFLOW SUMMER WORKSHOP | IOP PUBLISHING LTD | Published : 2014

Abstract

Critical points in the skin friction field of wall-bounded ows were investigated using data from direct numerical simulations of channels at Reτ = 934 and Reτ = 1834. A method for their detection and characterisation is outlined, and a statistical description of their properties is reported. Their lifetime, average distance, velocity and area density were computed. Conditionally averaged fields were calculated in order to examine the average ow in the vicinity of a critical point. It was found that the critical points are connected to surprisingly large features in the channel. A mechanism for the generation of the critical points is postulated, based on the conditional averages and analysis..

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Grants

Funding Acknowledgements

F u n d e d i n p a r t b y t h e M u l t i flo w p r o g r a m o f t h e E u r o p e a n R e s e a r c h C o u n c i l. D r M o n t y a c k n o w l e d g e s t h e s u p p o r t o f t h e F u t u r e F e l l o w s h i p p r o g r a m o f t h e A u s t r a l i a n R e s e a r c h C o u n c i l.