Prof.Qinling Li

Department of Engineering and Mathematics, Sheffield Hallam University,

City Campus, Howard Street, Sheffield S1 1WB, UK

Bio

Dr Qinling Li obtained her PhD in the Aerodynamic Flight Mechanics Research Group, University of Southampton in 2003. She is very interested in fundamental research of compressible turbulence and its wide applications in industries. The research approaches mainly include high-order direct numerical simulations (DNS) and large eddy simulation (LES) for compressible wall-bounded and free shear flows. She started her research career with two UK Engineering & Physical Sciences Research Council (EPSRC) projects on 1) large-eddy simulation (LES) of vertical landing aircraft in descending phase in the Aeronautical and Automatics Engineering Department, Loughborough University, and 2) LES of turbofan flow-field and broadband noise predictions in the Department of Applied Mathematics and Theoretical Physics (DAMTP), University of Cambridge. Subsequently, she joined Sheffield Hallam University as a senior lecturer in Thermo-fluids and CFD for teaching and research in 2009. She has been active with research in supersonic jet in cross flow with/without combustion processes, and compressibility effects on spinning cylinders with international collaborations since 2016. She published technical publications in books, conference, peer-reviewed journals and provided many technical reports for industrial projects. She is a university co-op person for the ‘UK Fluids Network’, has been one of the founders and co-chairs of the International Symposium of Thermal-Fluid Dynamics (ISTFD) since 2019. She has also delivered plenary/keynote/invited lectures at various international conferences around the world. Besides, she serves as a reviewer for five prestige journals and has been on the editorial committee of the journal ‘Physics of Gases’, China Academy of Aerospace Aerodynamics (CAAA) since 2018. She is a member of Institute of Engineering & Technology (IET) in the UK.

Title

Numerical Accuracies in Compressible Computational Fluid Dynamics with Some Applications

Abstract

Compressible turbulence is fundamental which arises in various industrial applications. Many regimes have been widely studied by researchers. In this keynote lecture, different CFD approaches will be reviewed. First of all, high-order direct numerical simulation (DNS) of fundamental compressible wall-bounded turbulence will be presented using structured meshes for fully developed compressible channel flow and oblique shock waves/turbulent boundary layer interactions. An entropy-splitting approach splits the inviscid flux derivatives into conservative and nonconservative portions. The spatial difference operators satisfy a summation-by-parts condition, leading to a stable scheme for the initial boundary value problem using a generalized energy estimate. A Laplacian formulation of the viscous and heat conduction terms on the right-hand side of the Navier– Stokes equations is used to ensure that any tendency to odd–even decoupling associated with central schemes can be countered by the fluid viscosity. The second part of the lecture will focus on various industrial applications by employing LES and RANS methods, with structured and unstructured meshes. Resulting accuracies and errors, such as mesh quality/type, truncation error, turbulence model error, etc. will be addressed. Compressible wall-bounded and free shear flows, jet in crossflow with/without shock-waves, shock trains, turbulence mixing & enhancement, and combustion mechanism will be discussed.