Speaker: Prof.Jie Yao, BIT

Time: 16:00-17:00 p.m., July 25, 2023, GMT+8

Venue: Room 210, College of Engineering No.1 Building

Abstract:

Wall-turbulence is common in nature and technology, and an improved understanding of itsunderlying physics is essential for flow modelling and control. Among all the wall-turbulence, pipe is the most canonical one and are frequently encountered in a variety of environmental, technological, and even biological applications. We present well-resolved direct numericalsimulations of the flow in a smooth circular pipe of radius R and axial length 10zR at friction Reynolds numbers up to Rer = 5200. Various turbulence statistics are documented and compared with other DNS and experimental data in pipes as well as channels. Small but distinct differences between various datasets are identified. In addition, the wall shear stress fluctuations, the inner peak of axial velocity variance, and the wall and peak of r.m.s. pressure fluctuations continuously increase with Rer, and their difference between pipe and channel progressively decreases with increasing Rer. These high-fidelity data enable us to providebetter insights into the flow physics in the pipes as well as the similarity/difference amongdifferent types of wall turbulence.

Biography:

Jie Yao is a professor in Advanced Research Institute of MultidisciplinarySciences at BIT. He obtained the B.S. in Naniing University of Science andTechnology in 2011 and an M.S. in University of Houston in 2013 and ph.D. from Texas Tech University in 2019. After that, he becomes a PostdoctoralResearcher at Texas Tech University. Jie Yao's expertise is in vortex dynamics turbulence, flow control, and high-performance computing.

Source: College of Engineering