Liutex and Third Generation of Vortex Identification: Workshop from Aerospace and Aeronautics World Forum 2021

ISBN-13: 9789811989544 / Angielski / Twarda / 2023 / 424 str.

Yiqian Wang; Yisheng Gao; Chaoqun Liu

Opis

This proceedings highlights the applications of the newly introduced physical quantity Liutex in hydrodynamics and aerodynamics. Liutex is used to represent the fascinating rotational motion of fluids, i.e., the vortex. Ubiquitously seen in nature and engineering applications, the definition of vortices has been elusive. The Liutex vector provides a unique and systematic description of vortices. The proceedings collects papers presented in the invited workshop "Liutex and Third Generation of Vortex Identification for Engineering Applications" from Aerospace and Aeronautics World Forum 2021. The papers in this book cover both the theoretical aspects of Liutex and many applications in hydrodynamics and aerodynamics. The proceedings is a good reference for researchers in fluid mechanics who are interested in learning about the wide scope of applications of Liutex and using it to develop a new understanding of their research subjects.

Spis treści

1. Study of vortex and vorticity in a laminar flow 

2. Three-dimensional vortex structure identification of fluid coupling and analysis of spatial-temporal evolution mechanism 

3. Statistical analysis for Liutex growth in flow transition 

4. Identification of vortical structures of flows around a surface-piercing finite square cylinder with rounded corners 

5. Liutex-Shear interaction in turbulent channel flow 

6. Liutex investigation on hairpin vortex structures of boundary layer based on MSFLE and moving-PIV 

7. Liutex force field model for complex viscous flow field of ship in restricted waters 

8. Liutex-based integrated field inversion and machine learning framework for turbulence modeling 

9. A Liutex application in 3D DNS of free shear flows 

10. Analysis of vortex flows around a generic submarine based on Rortex 

11. Application of Omega-Liutex identification method in the ventilated cavities around a surface-piercing hydrofoil 

12. Numerical detection of vortex phenomena in a patient specific abdominal aortic aneurysm using liutex-based method 

13. Hierarchical clustering of vortical regions in transitional boundary layers 

14. Experimental studies on the evolution of hairpin vortex package in the boundary layer of a square tube 

15. Turbulence generation from asymmetric Liutex

O autorze

Yiqian Wang

Dr. Yiqian Wang is currently an associate professor at Soochow University, Suzhou, China. He obtained his Ph.D. from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2016. He did research at the University of Texas at Arlington as an visiting student under the supervision of Prof. Chaoqun Liu during 2014~2015. After graduation, he became a postdoctoral researcher at Tsinghua University for two years until 2019 when he joined Soochow University. He is one of the main contributors to the developments of the third generation of vortex identification methods, especially the Liutex-based system and the Omega methods. As the coeditor, he and Prof. Chaoqun Liu have published a proceeding book titled "Liutex and Third Generation of Vortex Definition and Identification, An Invited Workshop from Chaos 2020" with Springer. His research focuses on vortex identification, turbulence and numerical methods.

Yisheng Gao

Dr. Yisheng Gao is currently a lecturer at Nanjing University of Aeronautics and Astronautics University, Nanjing, China. He received his Bachelor of Engineering degree in Aircraft Design and Engineering (2007), Master of Engineering degree in Fluid Mechanics (2009) and Ph. D. degree in Fluid Mechanics (2016) from Nanjing University of Aeronautics and Astronautics University, China. He was a postdoctoral fellow at the University of Texas at Arlington, Texas, USA in 2017-2019. He has published more than 20 journal and conference papers and has been one of the main contributors to the developments of the third generation of vortex identification methods. His research is concerned with computational fluid dynamics, including direct numerical simulation and discrete adjoint methods.

Chaoqun Liu

Dr. Chaoqun Liu received both BS (1968) and MS (1981) from Tsinghua University, Beijing, China and PhD (1989) from University of Colorado at Denver, USA. He is currently the Tenured and Distinguished Professor and the Director of Center for Numerical Simulation and Modeling at University of Texas at Arlington, Arlington, Texas, USA. He has worked on high order direct numerical simulation (DNS) and large eddy simulation (LES) for flow transition and turbulence for 32 years since 1990. As PI, he has been awarded by NASA, US Air Force and US Navy with 50 federal research grants of over 5.7 × 106 US dollars in the United States. He has published 14 professional books, 140 journal papers and 158 conference papers. He is the founder and main contributor of Liutex and the third generation of vortex definition and identification methods including the Omega, Liutex/Rortex, Modified Liutex-Omega, Liutex-Core-Line methods, Objective Liutex, RS vorticity decomposition and UTA R-NR velocity gradient tensor decomposition. He is also the founder of Liutex based new fluid kinematics.