Acta Mechanica Sinica
The Journal covers all disciplines in the field of theoretical and applied mechanics, including solid mechanics, fluid mechanics, dynamics and control, and biomechanics. It explores analytical, computational and experimental progresses in all areas of mechanics. The Journal also encourages research in interdisciplinary subjects, and servess...
CN 11-2063/O3
ISSN 0567-7718(Print)
ISSN 1614-3116(Online)
Editors-in-Chief:
Professor Tianjian Lu
Professor Wei Shyy
Professor Zhigang Suo
Impact Factor: 0.887
Citation: Acta Mech. Sin.
Frequency: Bimonthly
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Acta Mechanica Sinica--2016, 32 (1)   Published: 20 January 2016
FLUID MECHANICS
Large-eddy simulation of circular cylinder flow at subcritical Reynolds number: Turbulent wake and sound radiation Hot!
Li Guo, Xing Zhang, Guowei He
Abstract

The flows past a circular cylinder at Reynolds number 3900 are simulated using large-eddy simulation(LES) and the far-field sound is calculated from the LES results. A low dissipation energy-conserving finite volume scheme is used to discretize the incompressible Navier-Stokes equations. The dynamic global coefficient version of the Vreman's subgrid scale(SGS) model is used to compute the sub-grid stresses. Curle's integral of Lighthill's acoustic analogy is used to extract the sound radiated...

Comparative assessment of SAS and DES turbulence modeling for massively separated flows
Weilin Zheng, Chao Yan, Hongkang Liu, Dahai Luo
Abstract

Numerical studies of the flow past a circular cylinder at Reynolds number 1.4×105 and NACA0021 airfoil at the angle of attack 60°have been carried out by scale-adaptive simulation(SAS) and detached eddy simulation(DES), in comparison with the existing experimental data. The new version of themodel developed by Egorov and Menter is assessed, and advantages and disadvantages of the SAS simulation are analyzed in detail to provide guidance for industrial application in the f...

Large eddy simulation of boundary layer flow under cnoidal waves
Yin-Jun Li, Jiang-Bo Chen, Ji-Fu Zhou, Qiang Zhang
Abstract

Water waves in coastal areas are generally nonlinear, exhibiting asymmetric velocity profiles with different amplitudes of crest and trough. The behaviors of the boundary layer under asymmetric waves are of great significance for sediment transport in natural circumstances. While previous studies have mainly focused on linear or symmetric waves, asymmetric wave-induced flows remain unclear, particularly in the flow regime with high Reynolds numbers. Taking cnoidal wave as a typical example of...

Effect of quadratic pressure gradient term on a one-dimensional moving boundary problem based on modified Darcy's law
Wenchao Liu, Jun Yao, Zhangxin Chen, Yuewu Liu
Abstract

Arelatively high formation pressure gradient can exist in seepage flow in low-permeable porous media with a threshold pressure gradient, and a significant error may then be caused in the model computation by neglecting the quadratic pressure gradient term in the governing equations. Based on these concerns, in consideration of the quadratic pressure gradient term, a basic moving boundary model is constructed for a one-dimensional seepage flowproblem with a threshold pressure gradient. Owing t...

SUPG finite element method based on penalty function for lid-driven cavity flow up to Re=27500
Da-Guo Wang, Qing-Xiang Shui
Abstract

A streamline upwind/Petrov-Galerkin(SUPG) finite element method based on a penalty function is proposed for steady incompressible Navier-Stokes equations. The SUPG stabilization technique is employed for the formulation ofmomentumequations. Using the penalty function method, the continuity equation is simplified and the pressure of themomentum equations is eliminated. The lid-driven cavity flow problem is solved using the present model. It is shown that steady flow simulations are computable ...

Lagrangian-based investigation of the transient flow structures around a pitching hydrofoil
Qin Wu, Biao Huang, Guoyu Wang
Abstract

The objective of this paper is to address the transient flow structures around a pitching hydrofoil by combining physical and numerical studies. In order to predict the dynamic behavior of the flow structure effectively, the Lagrangian coherent structures(LCS) defined by the ridges of the finite-time Lyapunov exponent(FTLE) are utilized under the framework of Navier-Stokes flow computations. In the numerical simulations, the k-ω shear stress transport(SST) turbulence m...

Engine performance analysis and optimization of a dual-mode scramjet with varied inlet conditions
Lu Tian, Li-Hong Chen, Qiang Chen, Feng-Quan Zhong, Xin-Yu Chang
Abstract

A dual-mode scramjet can operate in a wide range of flight conditions. Higher thrust can be generated by adopting suitable combustion modes. Based on the net thrust, an analysis and preliminary optimal design of a kerosene-fueled parameterized dual-mode scramjet at a crucial flight Mach number of 6 were investigated by using a modified quasi-one-dimensional method and simulated annealing strategy. Engine structure and heat release distributions, affecting the engine thrust, were chosen as ana...

SOLID MECHANICS
A review on the application of modified continuum models in modeling and simulation of nanostructures
K. F. Wang, B. L. Wang, T. Kitamura
Abstract

Analysis of the mechanical behavior of nanostructures has been very challenging. Surface energy and nonlocal elasticity of materials have been incorporated into the traditional continuum analysis to create modified continuum mechanics models. This paper reviews recent advancements in the applications of such modified continuum models in nanostructures such as nanotubes, nanowires, nanobeams, graphenes, and nanoplates. A variety of models for these nanostructures under static and dynamic loadi...

Modeling rock specimens through 3D printing: Tentative experiments and prospects
Quan Jiang, Xiating Feng, Lvbo Song, Yahua Gong, Hong Zheng, Jie Cui
Abstract

Current developments in 3D printing(3DP) technology provide the opportunity to produce rock-like specimens and geotechnical models through additive manufacturing, that is, from a file viewed with a computer to a real object. This study investigated the serviceability of 3DP products as substitutes for rock specimens and rock-type materials in experimental analysis of deformation and failure in the laboratory. These experiments were performed on two types of materials as follows:(1) compressiv...

Modelling long-term deformation of granular soils incorporating the concept of fractional calculus
Yifei Sun, Yang Xiao, Changjie Zheng, Khairul Fikry Hanif
Abstract

Many constitutive models exist to characterise the cyclic behaviour of granular soils but can only simulate deformations for very limited cycles. Fractional derivatives have been regarded as one potential instrument for modelling memory-dependent phenomena. In this paper, the physical connection between the fractional derivative order and the fractal dimension of granular soils is investigated in detail. Then amodified elasto-plastic constitutive model is proposed for evaluating the long-term...

Residual stress in the cylindrical drawing cup of SUS304 stainless steel evaluated by split-ring test
Liang-Hong Xiao, Dao-He Yuan, Jun-Zhong Xiang, Jin-Gang Liu, Yi-Chun Zhou
Abstract

The residual stresses in the wall of a SUS304 stainless steel cylindrical drawing cup were evaluated by split-ring tests, and the influences of stamping die parameters on the residual stress were investigated. Anewtheoretical model of a split-ring test was developed to evaluate the residual stress in a ring, which was verified to be reasonable and reliable by numerical simulations with ABAQUS code and by nanoindentation tests. Seven groups of split-ring tests were completed, and the residual ...

An anisotropic micromechanics model for predicting the rafting direction in Ni-based single crystal superalloys
Shuang-Yu Li, Wen-Ping Wu, Ming-Xiang Chen
Abstract

An anisotropic micromechanics model based on the equivalent inclusion method is developed to investigate the rafting direction of Ni-based single crystal superalloys. The micromechanical model considers actual cubic structure and orthogonal anisotropy properties. The von Mises stress, elastic strain energy density, and hydrostatic pressure in different inclusions of micromechanical model are calculated when applying a tensile or compressive loading along the [001] direction. The calculated re...

DYNAMICS, VIBRATION, AND CONTROL
Coupling dynamic analysis of spacecraft with multiple cylindrical tanks and flexible appendages
Wen-Jun Wu, Bao-Zeng Yue, Hua Huang
Abstract

This paper is mainly concerned with the coupling dynamic analysis of a complex spacecraft consisting of one main rigid platform, multiple liquid-filled cylindrical tanks, and a number of flexible appendages. Firstly, the carrier potential function equations of liquid in the tanks are deduced according to the wall boundary conditions. Through employing the Fourier-Bessel series expansion method, the dynamic boundaries conditions on a curved free-surface under a low-gravity environment are tran...

Steady-state responses of a belt-drive dynamical system under dual excitations
Hu Ding
Abstract

The stable steady-state periodic responses of a belt-drive system with a one-way clutch are studied. For the first time, the dynamical system is investigated under dual excitations. The system is simultaneously excited by the firing pulsations of the engine and the harmonic motion of the foundation. Nonlinear discrete-continuous equations are derived for coupling the transverse vibration of the belt spans and the rotations of the driving and driven pulleys and the accessory pulley. The nonlin...

Non-intrusive hybrid interval method for uncertain nonlinear systems using derivative information
Zhuang-Zhuang Liu, Tian-Shu Wang, Jun-Feng Li
Abstract

This paper proposes a new non-intrusive hybrid interval method using derivative information for the dynamic response analysis of nonlinear systems with uncertain-butbounded parameters and/or initial conditions. This method provides tighter solution ranges compared to the existing polynomial approximation interval methods. Interval arithmetic using the Chebyshev basis and interval arithmetic using the general form modified affine basis for polynomials are developed to obtain tighter bounds for...

Effect of crystalline grain structures on the mechanical properties of twinning-induced plasticity steel
Kun Wang, Dan Wang, Fusheng Han
Abstract

In order to improve the mechanical properties of twinning-induced plasticity steel, the grain morphology was tailored by different solidification technologies combined with deformation and heat treatment processing routes. Three typical grain morphologies, i. e., equiaxed, columnar as well as equiaxed/columnar grains were formed, and their mechanical behaviors were comparatively studied. Among the three materials, the equiaxed grain material exhibited the highest strength but the lowest plast...

 
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