Ankang Gao

Ankang Gao
University of Science and Technology of China | USTC · Department of modern mechanics

Doctor of Philosophy

About

9
Publications
2,369
Reads
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50
Citations
Additional affiliations
January 2020 - present
Imperial College London
Position
  • Research Associate
Description
  • Study the instability of leading-edge vortex generated by a plunging airfoil; Develop Nektar++ code;

Publications

Publications (9)
Conference Paper
Full-text available
The two-dimensional to three-dimensional transition of a flow past a plunging NACA 0012 airfoil at a Reynolds number of Re = 400, based on the chord length c, and an angle of attack of 15 degrees was investigated using global linear stability analysis and spanwise-homogeneous direct numerical simulation (DNS). The peak-to-peak plunging amplitude wa...
Article
The vortex dynamics of leading-edge vortices on plunging high-aspect-ratio ( AR = 10) wings and airfoils were investigated by means of volumetric velocity measurements, numerical simulations and stability analysis to understand the deformation of the leading-edge vortex filament and spanwise instabilities. The vortex filaments on both the wing and...
Article
Full-text available
The bypass transition mechanism of the Stokes boundary layer in the intermittently turbulent regime - Volume 896 - Chengwang Xiong, Xiang Qi, Ankang Gao, Hui Xu, Chengjiao Ren, Liang Cheng
Article
Full-text available
A study of longitudinal processes and interactions in compressible viscous flows - Volume 893 - F. Mao, L. L. Kang, J. Z. Wu, J.-L. Yu, A. K. Gao, W. D. Su, X.-Y. Lu
Article
Full-text available
As a basic principle in classical mechanics, the Galilean invariance states that the force is the same in all inertial frames of reference. But this principle has not been properly addressed by most unsteady aerodynamic force theories, if the partial force contributed by a local flow structure is to be evaluated. In this note, we discuss the Galile...
Article
For steady flow, one usually decomposes the total drag into different components by wake-plane integrals and seeks their reduction strategies separately. Unlike the body-surface stress integral, the induced drag as well as the profile drag has been found to depend on the streamwise location of the wake plane used for drag estimate. It gradually dim...
Article
A series of far-field methods based on the momentum balance have been developed recently to predict and decompose the aerodynamic drag in the steady flow past a body. In this work, a far-field approach based on the energy equation is developed to study the aerodynamic drag in compressible flows. A new drag formula expressed solely by a wake-plane i...
Article
Full-text available
The thrust generated by heaving airfoil in incompressible flow is studied both numerically and theoretically. It is found that the behaviors of leading-edge vortex (LEV) under different airfoil’s transverse velocities have an important influence on the thrust. When this velocity is small, the LEV is advected downstream regularly; however, as transv...
Article
Full-text available
Why the stall of an airfoil can be significantly delayed by its pitching-up motion? Various attempts have been proposed to answer this question over the past half century, but none is satisfactory. In this Letter we prove that a chain of vorticity-dynamics processes at accelerating boundary is fully responsible for the causal mechanism underlying t...

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Projects

Project (1)
Project
The present project aims at developing a complete set of viscous compressible theory for complex external flow diagnosis.