能源与动力工程系

Department of Energy and Power Engineering

“烽火台”系列学术讲座第七十九期:On the structural organisation of wall-bounded shear

报告题目:On the structural organisation of wall-bounded shear flows with inspirations from the attached-eddy framework. 

报告人: Prof. Dominik Krug

报告人单位:University of Twente

报告时间:Jan.8 (Tuesday)3:00pm-5:00pm

报告地点:B-518, Lee Shau Kee Building of Science and Technology

邀请人: Prof. Chao Sun 

Abstract:

On the structural organisation of wall-bounded shear ?ows with inspirations from the attachededdy framework.  We present investigations on three di?erent aspects of wall-bounded turbulence and loosely relate our ?ndings to Townsend’s attached eddy hypothesis (AEH). First, we introduce a new formulation for the deviation of the mean velocity pro?le from the log-law in the outer, or `wake’, region of wallbounded ?ows. This formulation is inspired by the observation of uniform momentum zones in the ?ow. Secondly, we analyse the streetwise coherence spectrogram from 2-point measurements with reference near the wall to reveal self-similarity of wall-attached structures, as presumed by the AEH. Finally, we highlight some results on the scaling of structure functions in the energy containing range in wall turbulence. In particular, we demonstrate some degree of universality across di?erent ?ow geometries using the extended self-similarity framework previously derived for inertial-range scalings

Bio:

Dominik graduated from TU Darmstadt (Germany) with a Master’s degree (Dipl. Ing.) in Mechanical engineering in 2010 and received his PhD from ETH Zurich (Switzerland) in 2014. He is a recipient of the McKenzie postdoctoral fellowship (2015-2018) of the University of Melbourne (Australia), where he worked as a post-doc in the group of Prof. Ivan Marusic. In 2018, Dominik returned to Europe and joined the Physics of Fluids group at the University of Twente (Netherlands) as an Assistant Professor. His research interests include turbulent boundary layers, multiphase ?ows and experimental techniques such as Particle Tracking Velocimetry.

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