Shock wave/boundary layer interaction (SWBLI) is a widespread phenomenon in supersonic flows and has received extensive attention. The boundary generated due to viscous stress, which kind of macroscopic manifestation molecular nonequilibrium motion, namely, effects. In this paper, an investigation conducted on SWBLI from the perspective A method proposed for studying effects based Navier–Stokes (NS) equations Reynolds-averaged NS (RANS) equations. at Mach 2 6 concerned. results show that...

Oblique detonation waves (ODWs) are induced by oblique shock (OSWs) and hold significant research value for air-breathing ramjet engines due to their high thermodynamic efficiency specific impulse. In this research, is using a curved wave (CSW) that provides greater flexibility compared an OSW. Curved (CDWs) classified into two categories based on the curvature of CSW: positive-curvature (PC-CDWs) negative-curvature (NC-CDWs). We conduct numerical investigation flow characteristics potential...

The initiation of oblique detonation waves (ODWs) is a key component the successful application wave engines (ODWEs). This paper numerically investigates ODWs under active control transverse jet by solving two-dimensional multi-species Euler equations, focusing on morphology flow fields as well relationship between structures and propulsive performance using concept thrust potential. Active significantly shortens length ODW. results reveal that jet-induced field shows four typical patterns...

In this study, a dynamic stall control strategy, called the co-flow jet (CFJ), is applied to rotor airfoil. The effect of CFJ on unsteady characteristics airfoil numerically investigated via numerical simulations Reynolds-averaged Navier-Stokes (URANS) equations coupled with Spalart-Allmaras (S-A) turbulence model. methods are validated by NACA0012 pitching case and NACA6415 based CFJ, good agreement experiments found. Via study typical conditions suppress OA212 airfoil, it verified that...

A lattice Boltzmann method for natural convection with multicomponent and multiphase fluids in a two‐dimensional square cavity is presented. The model combines passive‐scalar approach, which extended to be available immiscible flow this paper. It has good computational efficiency. of two the same are simulated using model, agreement literature data satisfactory. case study bubble different presented show heat transfer convection. also reflects potential present simulating thermal Rayleigh numbers.

The physical characteristics inside shock waves with nonequilibrium molecular motion are difficult to describe using conventional macroscopic methods. In this paper, hydrodynamic and thermodynamic effects caused by the strong velocity distribution at a wave studied mesoscopic kinetic approach. This approach is based on lattice Boltzmann method method. former adopts compressible double-distribution-function model separated density total energy functions. latter represents through moments...

This paper presents a detailed description of molecular velocity distribution-based mesoscopic kinetic approach that enables better understanding various nonequilibrium hydrodynamic and thermodynamic effects in shock waves, contact discontinuities, rarefaction waves. builds on the previous investigation into regular reflection shocks by further addressing physical meaning moments from view kinetics implications magnitude sign moments. To deepen effects, this work focuses one-dimensional...

A shock wave is a flow phenomenon that needs to be considered in the development of high-speed aircraft and engines. The traditional computational fluid dynamics (CFD) method describes it from perspective macroscopic variables, such as Mach number, pressure, density, temperature. thickness close level molecular free path, motion has strong influence on wave. According analysis Chapman-Enskog approach, nonequilibrium effect source term causes system deviate equilibrium state. can used obtain...

In this paper, two-phase fluid mixture flow in rectangular two-inlet cavity is studied using lattice Boltzmann method (LBM). To simulate fluids with large viscosity difference, the pseudo-potential model improved. The improved verified for surface tension through Laplace's law and shown much better performance simulating difference than model. multiple-relaxation-time (MRT) scheme used to enhance numerical stability. Then same different simulated by present (LB) model, LB volume-of-fluid...

The acoustic refraction induced by the shear layer in an open-jet wind tunnel causes a source shift when estimating location with beamforming. Traditional correction methods of are achieved through computational eff ort or limited using one-dimensional planar layer. In this paper, unified method for (UCMAR) is suitable three dimensions that covers several traditional forms. Meanwhile, UCMAR can consider more general configurations, such as temperature gradient on both sides and off -axis...

A lattice Boltzmann model on Hermite basis for compressible viscous flows is presented in this paper. The developed the framework of double-distribution-function approach, which has adjustable specific-heat ratio and Prandtl number. It contains a density distribution function flow field total energy temperature field. equilibrium determined by expansion, D3Q27 D3Q39 three-dimensional (3D) discrete velocity models are used, can be replaced easily. Moreover, an artificial viscosity introduced...

Starting characteristics restrict the operation limits of a hypersonic inlet. Enhancement starting ability thus serves as one most serious issues in propulsion system. In present work, we propose simple adaptive slot control method, which expands working range inlets to lower Mach number and shows very weak losses. Our simulation results applying five parallel geometrical design show substantial reduction number. The air flow inside channels is self-driven by pressure gradient located near...

The shear layer characteristics of an open-jet acoustic wind tunnel are key importance on measurements aeroacoustics. effects thickness, spreading angle and strength propagation source localization investigated through the mean/spreading with a self-similar velocity distribution. Based flow, is computed by linearized Euler equations via term, then obtained from beamforming technique combined theory Amiet. Results show that numerical method can precisely capture refraction reflection after...

Abstract In this work, a meshfree Lattice Boltzmann Flux Solver (LBFS) is proposed to resolve compressible flow problems based on scattered points without mesh connections. The new method employs the Least Square‐based Finite Difference (LSFD) scheme discretize governing equations. order simulate discontinuous such as shock wave, mid‐point between two adjacent nodes regarded interface over which Riemann problem established. local fluxes at point are reconstructed by LBFS using solution of...

An investigation method for thermal immiscible mixture fluid flow in rectangular multi-jet cavity using lattice Boltzmann (LBM) is presented to study influence of controllable factors on quality generated from the cavity. For flow, contact area fluids has great effect mixture. The basic idea investigate relationship between and key components. obtained through numerical simulation by an improved LBM, which temperature equation extended multicomponent system. A case three-jet present shown.