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	1. On the nonlinear instability of fiber suspensions in a Poiseuille flow
	Wan Zhanhong,Lin Jianzhong,Hongbing Xiong
	Mechanics 26 December 2005
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	Abstract:The nonlinear instability characteristics of fiber suspensions in a plane Poiseuille flow are investigated. The evolution equation of the perturbation amplitude analogous to Landau equation is formulated and solved numerically for different fiber parameters. It is found that the equilibrium amplitude decreases with the increase the fiber aspect ratio and volume fraction, i.e. the addition of the fibers reduces the amplitude of the perturbation, and leads to the reduction of the flow instability. This phenomenon becomes significant for large volume concentration and aspect ratio. The mechanism of the reduction of the flow instability is also analyzed by taking into account of the modification of the mean flow and the energy transfer from the mean flow to the perturbation flow.
	TO cite this article:Wan Zhanhong,Lin Jianzhong,Hongbing Xiong. On the nonlinear instability of fiber suspensions in a Poiseuille flow[OL].[26 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4651


	2. NONLINEAR LOW FREQUENCY WATER WAVES IN A CIRCULAR CYLINDER
	HuaiWu Peng,Cunbiao Lee
	Mechanics 08 December 2005
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	Abstract:The experiment was carried out to study the low frequency surface waves due to the horizontal high frequency excitation. The puzzling feature of the phenomenon was that the big amplitude axisymmetric surface wave frequency was typically about 1/50 of the excitation frequency. The viscous effect of water was neglect as a first approximation in the earlier papers on this subject, but we found the viscosity was important to achieve the low frequency water wave with the cooperation of hundreds of “finger” waves.
	TO cite this article:HuaiWu Peng,Cunbiao Lee. NONLINEAR LOW FREQUENCY WATER WAVES IN A CIRCULAR CYLINDER[OL].[ 8 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4176

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	3. TURBULENCE MODELLING OF OIL SLICK
	G.Q. Chen,L.Z. Zhang,Joseph H.W. Lee
	Mechanics 23 November 2005
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	Abstract:The motion of a lock-release oil slick as an immiscible two-fluid gravity current is numerical studied by a finite difference algorithm based on the volume of fluid (VOF) method for the basic formulation and a rigid cover approximation for the open free surface. Detailed numerical simulation with careful model validation reveals the existance of turbulence and the adaptability of the renormalization group (RNG) model for the Reynolds-stress closure in the case of the oil slick. The evolution of turbulence kinetic energy and turbulent viscosity is characterised, and asymptotic self-similar spreading laws are well reproduced. The mechanism for the transition from an initial gravity-inertial phase to a second gravity-viscous phase is shown to be the relaminarization effect of the initially highly turbulent slick.
	TO cite this article:G.Q. Chen,L.Z. Zhang,Joseph H.W. Lee. TURBULENCE MODELLING OF OIL SLICK[OL].[23 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3761


	4. Exact Solutions of Karman-Howarth Equations of Isotropic Turbulence
	Ran Zheng
	Mechanics 31 October 2005
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	Abstract:Based on von Karman’s self-preservation hypothesis, new four different exact solutions of Karman-Howarth equations are obtained for three-dimensional and two-dimensional isotropic turbulence, respectively.
	TO cite this article:Ran Zheng. Exact Solutions of Karman-Howarth Equations of Isotropic Turbulence[OL].[31 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3410


	5. THE RE-EXPLORATION OF THE SPATIAL OSCILLATIONS IN FINITE DIFFERENCE SOLUTIONS FOR NAVIER-STOKES SHOCKS
	Ran Zheng
	Mechanics 28 October 2005
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	Abstract:Through the preliminary numerical calculations, we gained confidence on the use of the NNDschemes, the principle of choice of the coefficients of the third order derivatives is still based on the linearized conclusion. Under the unsteady, nonlinear conditions, the validate is an open question. Symmeries could help us to reach a new conlusion, which domenstrated that the linearized conclusion is met with the similarity inavirants, but not for the Galileo invariants in general case. In this paper, the spatial oscillations in finite difference solutions for Navier-Stokes shocks are re-explored from a point view of group-invariance theory. It is shown that the oscillations of numerical solutions in the upstream and downstream regions of shock have link with the symmetry broken. The symmetry inherent necessary conditions must be satisfied for the choice of finite difference schemes.
	TO cite this article:Ran Zheng. THE RE-EXPLORATION OF THE SPATIAL OSCILLATIONS IN FINITE DIFFERENCE SOLUTIONS FOR NAVIER-STOKES SHOCKS[OL].[28 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3401


	6. On Symmetries of 1D Lattice-Boltzmann Equation
	Ran Zheng
	Mechanics 27 October 2005
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	Abstract:The Galilean and similarity invariance inherent in Navier-Stokes equations are not really recovered in one dimensional lattice Boltzmann equation, especially for shock calculation. Qian’s theoretical development recovering Navier-Stokes equations in LBE is questionable.
	TO cite this article:Ran Zheng. On Symmetries of 1D Lattice-Boltzmann Equation[OL].[27 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3394


	7. On Galilean Invariance of 1D Lattice-Boltzmann Equation
	Ran Zheng
	Mechanics 18 October 2005
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	Abstract:The Galilean invariance is not really recovered in one dimensional lattice Boltzmann equation, especially for shock calculation. Qian’s theoretical development recovering Navier-Stokes equations in LBE is questionable.
	TO cite this article:Ran Zheng. On Galilean Invariance of 1D Lattice-Boltzmann Equation[OL].[18 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3284


	8. Dynamics of large scales in isotropic turbulence
	Ran Zheng
	Mechanics 23 September 2005
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	Abstract:Some physically significant consequences of recent advances in the theory of self-preserved homogenous statistical solutions of the Navier-Stokes equations are presented. Integral lengthscales based on the solutions are discussed, and used to derive rigorously a new recursion equation, which would be help to understand the dynamics of turbulence, especially for the cascade. The energy spectrum and its behavior in the lowest wave number range are discussed. Previous two different theory (the Batchelor spectra, the Saffman spectra) could be unified by using present theory. According to the present theory, the Loitsianskii’s integral invariant is not an invariant in general case.
	TO cite this article:Ran Zheng. Dynamics of large scales in isotropic turbulence[OL].[23 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2988


	9. Analysis of Flow Field Asymmetry and Forces Acted on a Centrifugal Pump by a 3-D Numerical Simulation
	Si HUANG
	Mechanics 18 April 2005
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	Abstract:A three-dimensional turbulent flow through entire a single-stage centrifugal pump is numerically simulated using FLUENT software. The analysis is completed in a multiple reference frame. The standard k-e turbulence models is applied. It is found obviously in the simulation that flow field is asymmetric, i.e., flow speed and pressure field are total different among all channels in the impeller, causing unbalance of hydrodynamic load on impeller blades. Axial- and radial-directional forces generated by such unbalance acted on the pump are calculated as well. The results indicate that radial-directional force due to asymmetry of flow field is significant and probably affects stability of pump working. The current computation is verified by comparing predicted and measured head.
	TO cite this article:Si HUANG. Analysis of Flow Field Asymmetry and Forces Acted on a Centrifugal Pump by a 3-D Numerical Simulation[OL].[18 April 2005] http://en.paper.edu.cn/en_releasepaper/content/1881

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