Yanbing Li

Bio: Yanbing Li is an academic researcher from Exa Corporation. The author has contributed to research in topics: Lattice Boltzmann methods & Large eddy simulation. The author has an hindex of 11, co-authored 26 publications receiving 485 citations.

Numerical study of flow past an impulsively started cylinder by the lattice-Boltzmann method

Abstract: In this paper a systematic numerical study of flow past an impulsively started circular cylinder at low and moderate Reynolds numbers using a lattice-Boltzmann algorithmic approach is presented together with an extended volumetric boundary scheme. Results agree well with some well-known previous works. It is demonstrated that in the nearly incompressible limit, this approach is able to provide accurate direct numerical simulations of unsteady flows with curved geometry.

Lattice Boltzmann Approach for Local Reference Frames

Abstract: In this paper we present a generalized lattice Boltzmann based approach for sliding-mesh local reference frame. This scheme exactly conserves hydrodynamic fluxes across local reference frame interface. The accuracy and robustness of our scheme are demonstrated by benchmark validations.

Towards Lattice-Boltzmann Prediction of Turbofan Engine Noise

Abstract: The goal of the present paper is to report verification and validation studies carried out by Exa Corporation in the framework of turbofan engine noise prediction through the hybrid Lattice-Boltzmann/Ffowcs-Williams & Hawkings approach (LB)-(FW-H). The underlying noise generation and propagation mechanisms related to the jet flow field and the fan are addressed separately by considering a series of elementary numerical experiments. As far as fan and jet noise generation is concerned, validation studies are performed by comparing the LB solutions with literature experimental data, whereas, for the fan noise transmission through and radiation from the engine intake and bypass ducts, LB solutions are compared with finite element solutions of convected wave equations. In particular, for the fan noise propagation, specific verification analyses are carried out by considering tonal spinning duct modes in the presence of a liner, which is modelled as an equivalent acoustic porous medium. Finally, a capability overview is presented for a comprehensive turbofan engine noise prediction, by performing LB simulation for a generic but realistic turbofan engine configuration.

Lattice Boltzmann method for adiabatic acoustics

Abstract: The lattice Boltzmann method (LBM) has been proved to be a useful tool in many areas of computational fluid dynamics, including computational aero-acoustics (CAA). However, for historical reasons, its applications in CAA have been largely restricted to simulations of isothermal (Newtonian) sound waves. As the recent kinetic theory-based reformulation establishes a theoretical framework in which LBM can be extended to recover the full Navier–Stokes–Fourier (NS) equations and beyond, in this paper, we show that, at least at the low-frequency limit (sound frequency much less than molecular collision frequency), adiabatic sound waves can be accurately simulated by the LBM provided that the lattice and the distribution function ensure adequate recovery of the full NS equations.

Simulation of Flow over an Iced Airfoil by Using a Lattice-Boltzmann Method

Abstract: A Lattice-Boltzmann Method (LBM) is presented and applied to simulate subsonic flow over a business-jet airfoil with ice accrued on its leading edge at several angles of attack. The effects of turbulence are modeled by using two transport equations based on a revised renormalization-group theory, and realized through an effective particle-relaxation-time scale in the extended kinetic equations. A wall-shear stress model is used to reduce the nearwall resolution requirement. Flow solutions were obtained on a Cartesian grid system that resolves the boundary geometry exactly. Results compare well with experimental measurements even at angles of attack near stall.

Boundary Layer Theory

Abstract: The boundary layer equations for plane, incompressible, and steady flow are $$\matrix{ {u{{\partial u} \over {\partial x}} + v{{\partial u} \over {\partial y}} = - {1 \over \varrho }{{\partial p} \over {\partial x}} + v{{{\partial ^2}u} \over {\partial {y^2}}},} \cr {0 = {{\partial p} \over {\partial y}},} \cr {{{\partial u} \over {\partial x}} + {{\partial v} \over {\partial y}} = 0.} \cr }$$

Incorporating Turbulence Models Into The Lattice-Boltzmann Method

Abstract: The Lattice-Boltzmann method (LBM) is extended to allow incorporation of traditional turbulence models. Implementation of a two-layer mixing-length algebraic model and two versions of the k-e two-e...