Acta Mechanica Sinica
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On the pressure and stress singularities induced by steady flows of a pair of nonmiscible, incompressible, viscous fluids in contact with a wall
Acta Mechanica Sinica - - 2010
Design for structural integrity requires an appreciation of where stress singularities can occur in structural configurations. While there is a rich literature devoted to the identification of such singular behavior in solid mechanics, only of late has there been much in the way of corresponding identifications of flow-induced stress singularities in fluid mechanics. These recent asymptotic identi...... hiện toàn bộ
Stability analyses of the mass abrasive projectile high-speed penetrating into concrete target. Part II: Structural stability analyses
Acta Mechanica Sinica - Tập 30 - Trang 943-955 - 2014
The initial oblique and attacking angles as well as the asymmetrical nose abrasion may lead to bending or even fracture of a projectile, and the penetration efficiency decreases distinctly. The structural stability of a high-speed projectile non-normally penetrating into concrete and the parametric influences involved are analyzed with the mass abrasion taken into account. By considering the symme...... hiện toàn bộ
A multifractal model for linking Lagrangian and Eulerian velocity structure functions
Acta Mechanica Sinica - - 2014
Design method for an acoustic cloak in flows by topology optimization
Acta Mechanica Sinica - Tập 35 - Trang 964-971 - 2019
In this paper, a design method for an acoustic cloak in the presence of background mean flows is proposed by using topology optimization, which enables the associated fabrication of the cloaking design. The density-based topology optimization method is used to allocate the designated materials, thus providing the structure of the cloak. The optimization problem is efficiently solved with the gradi...... hiện toàn bộ
On the accuracy of two-temperature models for hypersonic nonequilibrium flow
Acta Mechanica Sinica - Tập 39 - Trang 1-12 - 2022
Due to the empirical assumptions, the widely-used two-temperature models for hypersonic nonequilibrium flow include considerable uncertainties. To overcome the limitations and shortcomings of two-temperature models, the modified Macheret-Fridman model is developed based on the correction method of the modified Marrone-Treanor model. Some typical test cases are employed to assess the accuracy of th...... hiện toàn bộ
An unconditionally stable calculation scheme for the dynamic response of structures by the method of spline collocation
Acta Mechanica Sinica - Tập 4 - Trang 156-164 - 1988
In this paper, by the method of collocation, using the cubic β-spline function as the trial function in the time domain and putting zero residuals of the differential equation of motion of the structure at two points of time, the authors obtain an unconditionally stable calculation scheme for the dynamic response of the structure. When a parameter σ in the scheme is within the interval 0.15<σ <0.5...... hiện toàn bộ
On the identification of residual impact properties of materials by acousto-ultrasonics —A pattern recognition approach
Acta Mechanica Sinica - Tập 11 - Trang 34-43 - 1995
This paper deals with the application of Acousto-ultrasonics, in conjunction with Pattern Recognition and Classification techniques, to the identification of residual impact properties of a class of polymeric material, namely, Polyvinylchloride (PVC). PVC specimens of different low-energy repeated impact damage states are processed by Acousto-ultrasonics (AU) to retrieve AU signals in the form of ...... hiện toàn bộ
Intrinsic instability of the lattice BGK model
Acta Mechanica Sinica - Tập 18 Số 6 - Trang 603-607 - 2002
Theoretical mean wave resistance of precursor solition generation in two-layer flow
Acta Mechanica Sinica - Tập 13 - Trang 1-9 - 1997
A new concept of pseudo mean wave resistance is introduced to find theoretical mean wave resistances of the precursor soliton generation in two-layer flow over a localized topography at near-resonance in this paper. The pseudo mean wave resistance of the precursor soliton generation of two-layer flow is determined in terms of the AfKdV equation. From the theoretical results it is shown that the th...... hiện toàn bộ
Numerical studies of undulation control on dynamic stall for reverse flows
Acta Mechanica Sinica - Tập 36 - Trang 290-305 - 2020
The delayed detached-eddy simulation with adaptive coefficient (DDES-AC) method is used to simulate the baseline and leading-edge undulation control of dynamic stall for the reverse flow past a finite-span wing with NACA0012 airfoil. The numerical results of the baseline configuration are compared with available measurements. DDES and DDES-AC perform differently when predicting the primary and sec...... hiện toàn bộ
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