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1. Control of Vortex Structures on a Rectangular Slab via a Sinusoidal Surface | |||
Zou, Lin | |||
Mechanics 31 March 2010 | |||
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Abstract:The present investigations focus attention on numerical simulations of three-dimensional flow around wavy rectangular slabs with sinusoidal variations in cross-section area along the spanwise direction at low Reynolds numbers of 100 and 500. The detailed near wake vortex structures of the wavy rectangular slab are captured and the influence of the wavy rectangular slab side ratio (L/Dm=1 to 8) is discussed compared with a straight rectangular slab with the same side ratio. Moreover, the pressure field, velocity field and force coefficients around the wavy surfaces are also calculated. The present numerical simulations show that the three-dimensional free shear layers behind the wavy rectangular slab are more stable than those of the straight rectangular slab. At L/Dm≥2, the free shear layers are even difficult to roll up into a mature vortex street behind the wavy slab at Re=100. The mean drag reduced with the r.m.s. lift of the wavy rectangular slabs being greatly suppressed compared with the straight rectangular slab for all side ratios at Re=500. A drag reduction of up to 32% at L/Dm=1 is obtained. It indicated that the wavy slab is capable of minimization of flow-induced vibration and drag reduction compared with the rectangular slab in cross flow conditions. | |||
TO cite this article:Zou, Lin. Control of Vortex Structures on a Rectangular Slab via a Sinusoidal Surface[OL].[31 March 2010] http://en.paper.edu.cn/en_releasepaper/content/41413 |
2. Galilean invariance in two-dimensional lattice BGK models | |||
Ran zheng | |||
Mechanics 03 February 2007 | |||
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Abstract:The Galilean invariance inherent in Navier-Stokes equations is not really recovered in two dimensional lattice Boltzmann equation, especially for shock calculation. This paper presents a systematic analysis on this subject. | |||
TO cite this article:Ran zheng. Galilean invariance in two-dimensional lattice BGK models [OL].[ 3 February 2007] http://en.paper.edu.cn/en_releasepaper/content/11027 |
3. 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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