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	1. Numerical simulation of slit-vent cylinder flow
	Zhu Rui
	Mechanics 18 July 2016
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	Abstract:The research focuses on the influence of modifications of slit-vent parameters on the flow field of a split-vent cylinder and the modulating effect on vortex shedding frequency. Based on the FLUENT software, the vortices conditions of three different wide aperture slit-vent cylinders (s/d=0.1, 0.15, 0.2) are studied and simulated under five different Reynolds conditions (Re=1500, 3000, 4400, 5600, 7200). A series of fluctuatingly oscillating vortices caused by cylinder boundary layer blowing and suction effect inside the slit-vent cylinder aperture are discovered through CFD (Computational Fluid Dynamics) analysis and simulation. The simulation results also achieve the wake flow vortices' shedding frequencies under different water tunnel speeds for the standard and split-vent cylinders.
	TO cite this article:Zhu Rui. Numerical simulation of slit-vent cylinder flow[OL].[18 July 2016] http://en.paper.edu.cn/en_releasepaper/content/4700719


	2. Interaction Function of Coupled Bursting Neurons
	ZHANG Jiadong, SHI Xia
	Mechanics 18 December 2015
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	Abstract:The interaction functions of electrically coupled Hindmarsh-Rose (HR) neurons for different firing patterns are investigated in this paper. By applying the phase reduction technique, the burst phase response curve (BPRC) of the bursting neuron is derived. Then the interaction function of two coupled neurons can be calculated numerically according to the BPRC and the voltage time course of the neuron. Results show that the BPRC is more and more complicated with the increase of the spiking number within a burst, and the curve of the interaction function oscillates more and more frequently with it. However, two certain things are unchanged: $phi=0$, which corresponds to the in-phase synchronization state, is always the stable equilibrium, while the anti-phase synchronization state with $phi=0.5$ is an unstable equilibrium.
	TO cite this article:ZHANG Jiadong, SHI Xia. Interaction Function of Coupled Bursting Neurons[OL].[18 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4672312

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	3. Molecular dynamics simulations of nanoscale Poiseuille flow
	Hu Haibao,Bao Luyao
	Mechanics 29 October 2014
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	Abstract:The studies about microcosmic flow behavior on hydrophobic surfaces are important for exploring the drag reduction mechanism in detail. To elucidate the slip behavior of nanoscale Poiseuille flow with different wettability boundary, we have investigated parametrically the effects of wall-fluid interaction and driving force on the slippage, using the nonequilibrium molecular dynamics simulation method. The results obtained show that the average velocity and slip length firstly increase and then decrease with the increase of wall fluid interaction, which are quite strange to the common notion. And an underlying molecular-kinetic mechanism about this phenomenon is implied. Meanwhile the results of various driving forces also reveal that driving force affects density distributions slightly, but velocity distributions and slip lengths significantly in the hydrophobic nanochannel.
	TO cite this article:Hu Haibao,Bao Luyao. Molecular dynamics simulations of nanoscale Poiseuille flow[OL].[29 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4613937


	4. An approach for the numerical simulation of ultra-high speed compressible supercavitating flows
	Ying Chen,Chuanjing Lu,Xin Chen,Jie Li,Jiayi Cao
	Mechanics 04 July 2014
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	Abstract:Ultra-high speed projectile running in water with the velocity close to the speed of sound usually causes large supercavity. For the computation of such transonic cavitating flows, a high-speed model reflecting the compressibility of both the liquid and the vapor phases is suggested in this paper. The model is achieved within a self-developed numerical solver and well used to simulate the ultra-high speed subsonic supercavitating flows. An improved TAIT equation corrected with local temperature is adopted as the equation of state (EOS) for the liquid phase, and the Peng-Robinson EOS is used for the vapor phase. A cubic nonlinear eddy viscosity turbulence model (NLEVM) is introduced to provide better treatment on the anisotropic turbulence stresses in the large-scaled swirling flow structure inside the cavity. The ultra-high speed (Ma=0.7) supercavitating flows around disk cavitator and cylindrical object are investigated and compared with the results in low speed (Ma=0.007) condition. The flow variables are reasonably predicted, and the cavity profiles are compared to be close to the experimental empirical formula. An important conclusion in the compressible cavitating flow theory is verified by the numerical result that, at any specific cavitation number the cavity's size and the drag coefficient both increase along with the rise of Mach number. On the contrary, it is found as well that the cavity's slenderness ratio decreases when Mach number goes up. It indicates that the compressibility has different influences on the length and the radius of the supercavity.
	TO cite this article:Ying Chen,Chuanjing Lu,Xin Chen, et al. An approach for the numerical simulation of ultra-high speed compressible supercavitating flows[OL].[ 4 July 2014] http://en.paper.edu.cn/en_releasepaper/content/4603442


	5. Phase coexistence of decomposing ferroelectric solid solutions near morphotropic boundary
	Y. Ni
	Mechanics 13 February 2014
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	Abstract:Three-dimensional computational modeling and theory predicts new feature of two-phase coexistence, i.e. appearance of a tetragonal-orthorhombic mixed state, other than conventional tetragonal-rhombohedral coexistence of decomposing Pb(Zr1-xTix)O3 (PZT) ferroelectric solid solutions near the morphotropic phase boundary (MPB). It shows that the new phase-coexistence state is formed through the phase with weak polar anisotropy loosening the rotational stability of polarization, driven by significantly decreasing the energy due to the deformation and polarization incompatibility between two phases.
	TO cite this article:Y. Ni. Phase coexistence of decomposing ferroelectric solid solutions near morphotropic boundary[OL].[13 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4584715


	6. Computed effects of the number of guide vanes on performance of impulse turbine for OWC system
	CUI Ying,LIU Zhen,JIN Jiyuan,SHI Hongda
	Mechanics 24 December 2013
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	Abstract:The impulse turbine, as an important component for the second energy conversion of Oscillating Water Column (OWC) wave energy converter, is capable of converting low pressure pneumatic energy into mechanical shaft power in the con-dition of bi-directional flow. As is presented in the previous reports, the effects of guide vanes and rotor geometries, tip clearance and hub-to-tip radio have been investigated with both experimental method and numerical analysis, excepting the effects of the number of guide vanes. The present paper aims to benchmark the numerical simulation results with the experimental data and to explore the effects of the number of guide vanes on performance of impulse turbine with fixed guide vanes for structure optimization with the application of three-dimensional Computational Fluid Dynamics (CFD) analysis. In this work, Gambit 2.4 and Fluent 14.5 are employed to build 3-D models of the turbine with different numbers of guide vanes. As a result, the coherence between computed and experimental data is satisfactory, and the turbine with 30 guide vanes is predicted to obtain a higher efficiency.
	TO cite this article:CUI Ying,LIU Zhen,JIN Jiyuan, et al. Computed effects of the number of guide vanes on performance of impulse turbine for OWC system[OL].[24 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4576014


	7. An evaluation of convergence criteria on digital image correlation
	Pan Bing
	Mechanics 15 December 2013
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	Abstract:A fast, robust and accurate digital image correlation (DIC) method, which uses an efficient inverse compositional matching Gauss-Newton (IC-GN) algorithm, was recently proposed for full-field deformation measurement. As an iterative local optimization algorithm, IC-GN algorithm iteratively solves for the incremental warp assumed on the reference subset until the preset convergence criteria are satisfied. In the literature, different convergence criteria have been set for iterative optimization algorithms. However, on the one hand, stringent convergence criteria lead to increased number of iterations and lessen the computational efficiency. On the other hand, too loose convergence conditions enhance the computational efficiency but may decrease the registration accuracy. Understanding the impact of prescribed convergence criteria on DIC measurement and how to choose proper convergence criteria are therefore fundamental problems in realizing high-efficiency yet high-accuracy DIC analysis. In this paper, the convergence characteristics of IC-GN algorithm are investigated using real experimental images. The effect of various convergence criteria on the efficiency and accuracy of IC-GN algorithm are carefully examined. Recommendations are given to select proper convergence criteria for more efficient implement of IC-GN algorithm.
	TO cite this article:Pan Bing. An evaluation of convergence criteria on digital image correlation[OL].[15 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4575332


	8. Theoretic Solutions for Vortex Street behind a Cylinder
	XIAO Jianhua
	Mechanics 03 December 2013
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	Abstract:Using the inertial velocity field, in commoving dragging coordinator formulation, the instant deformation (deformation in unit time duration) of fluid is formulated. By linear momentum conservation and angular momentum conservation, the generally motion equations are established. They show that: along the streamline, if the instant local rotation angular is invariants, the flow velocity tends decrease. So, the curvature of streamline is increased gradually and finally ended in a center where flow velocity is zero. Through introducing a parameter function defined roughly along streamline, taking the velocity are known quantities, the theoretic solutions for the fluid instant deformation (flow behind circular cylinder) are obtained. Therefore, a set of form solution for digital calculations are established. These theoretic results are valuable for understanding the vortex flow. As a natural expectation, it is valuable for exposing the mechanism of turbulence phenomenon.
	TO cite this article:XIAO Jianhua. Theoretic Solutions for Vortex Street behind a Cylinder[OL].[ 3 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4572902


	9. A modified Mickens iteration method for self-excited systems with nonlinear damping terms
	Y.M. Chen,J.K. Liu
	Mechanics 31 January 2013
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	Abstract:The Mickens iteration method is modified for solving limit cycle oscillations (LCOs) of self-excited systems. Different from other existing procedures, the unknown frequency that arises in the nonlinearity is replaced by the previous iteration value. Therefore, the unknown frequency appears just in linear terms and its square can be considered as an independent parameter. Simpler algebraic equations are then deduced and solved numerically. Numerical examples show the modified algorithm can provide very accurate LC solutions. Since the unknown frequency is uncoupled from nonlinear terms, this approach is rather appropriate for a type of systems with nonlinear damping terms.
	TO cite this article:Y.M. Chen,J.K. Liu. A modified Mickens iteration method for self-excited systems with nonlinear damping terms[OL].[31 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4518353


	10. Three-dimensional finite-difference lattice Boltzmann model and its application to inviscid compressible flows with shock waves
	HE Yaling,LIU Qing,LI Qing
	Mechanics 30 January 2013
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	Abstract:In this paper, a three-dimensional (3D) finite-difference lattice Boltzmann model for simulating compressible flows with shock waves is developed in the framework of the double-distribution-function approach. In the model, a density distribution function is adopted to model the flow field, while a total energy distribution function is adopted to simulate the temperature field. The discrete equilibrium density and total energy distribution functions are derived from the Hermite expansions of the continuous equilibrium distribution functions. The discrete velocity set is obtained by choosing the abscissae of a suitable Gauss-Hermite quadrature with sufficient accuracy. In order to capture the shock waves in compressible flows and improve the numerical accuracy and stability, an implicit-explicit finite-difference numerical technique based on the total variation diminishing flux limitation is introduced to solve the discrete kinetic equations. The model is tested by numerical simulations of some typical compressible flows with shock waves ranging from 1D to 3D. The numerical results are found to be in good agreement with the analytical solutions and/or other numerical results reported in the literature.
	TO cite this article:HE Yaling,LIU Qing,LI Qing. Three-dimensional finite-difference lattice Boltzmann model and its application to inviscid compressible flows with shock waves[J].

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