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Integrated numerical model for vegetated surface and saturated subsurface flow interaction

Applied Mathematics and Mechanics(English Edition) 2012年第7期33卷 881-898页

作者： K. S. ERDURAN Department of Civil Engineering Faculty of Engineering University of Nigde Department of Civil Engineering College of Engineering American University of Sharjah

The construction of an integrated numerical model is presented in this paper to deal with the interactions between vegetated surface and saturated subsurface flows. A numerical model is built by integrating the previously developed quasi-three-dimensional （Q3D） vegetated surface flow model with a two-dimensional （2D） saturated groundwater flow model. The vegetated surface flow model is constructed by coupling the explicit finite volume solution of 2D shallow water equations （SWEs） with the implicit finite difference solution of Navier-Stokes equations （NSEs） for vertical velocity distribution. The subsurface model is based on the explicit finite volume solution of 2D saturated groundwater flow equations （SGFEs）. The ground and vegetated surface water interaction is achieved by introducing source-sink terms into the continuity equations. Two solutions are tightly coupled in a single code. The integrated model is applied to four test cases, and the results are satisfactory.

关键词： vegetated surface flow saturated groundwater flow flow interaction tightcoupling finite volume method finite difference method flow resistance

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Experimental investigation on the wing-wake interaction at the mid stroke in hovering flight of dragonfly

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Science China(Physics,Mechanics & Astronomy) 2012年第11期55卷 2167-2178页

作者： LAI GuoJun SHEN GongXin FFFOM Laboratory School of Aeronautic Science and EngineeringBeihang UniversityBeijing 100191China

This paper focuses on flow structures of the wing-wake interaction between the hind wing and the wake of the forewing in hovering flight of a dragonfly since there are arguments whether the wing-wake interaction is useful or not.A mechanical flapping model with two tandem wings is used to study the *** the device,two identical simplified model wings are mounted to the flapping model and they are both scaled up to keep the Reynolds number similar to those of dragonfly in hovering flight since our experiment is conducted in a water *** kinetic pattern of dragonfly(Aeschna juncea) is chosen because of its special interesting asymmetry.A multi-slice phase-locked stereo particle image velocimetry(PIV) system is used to record flow structures around the hind wing at the mid downstroke(t/T=0.25) and the mid upstroke(t/T=0.75).To make comparison of the flow field between with and without the influence of the wake,flow structures around a single flapping wing(hind wing without the existence of the forewing) at these two stroke phases are also recorded.A local vortex identification scheme called swirling strength is applied to determine the vortices around the wing and they are visualized with the iso-surface of swirling *** paper also presents contour lines of z at each spanwise position of the hind wing,the vortex core position of the leading edge vortex(LEV) of hind wing with respect to the upper surface of hind wing,the circulation of the hind wing LEV at each spanwise position and so *** results show that dimension and strength of the hind wing LEV are impaired at the mid stroke in comparison with the single wing LEV because of the downwash from the *** results also reveal that a wake vortex from the forewing traverses the upper surface of the hind wing at the mid downstroke and its distance to the upper surface is about 40% of the wing chord *** the instant,the distance of the hind wing LEV to the upper surface is abo

关键词： dragonfly hovering flight particle image velocimetry (PIV) flow interaction leading edge vortex

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Air interaction around outdoor air-cooled condensers

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Journal of Southeast University(English Edition) 2010年第2期26卷 222-226页

作者：王树刚张腾飞张剑大连理工大学土木工程学院大连116024

In order to increase cooling or heating efficiency,a porous computational fluid dynamics（CFD）model is employed to predict the thermo-fluid status and optimize the placement of outdoor units.A full scale model is established to validate the accuracy of CFD simulation in terms of velocity and temperature *** comparison between the measurement and the simulation shows a good *** evaluating the condensers＇ sucked air temperature with CFD for three units installed in a row,it is found that the minimum separation distance among neighboring units is 0.2 m;a vertical wall should be apart from the unit line by at least 0.8 m;and large different operating pressures among units do not impact the flow rate and the heat transfer of the other units meaningfully.

关键词： air-cooled condensers flow interaction heat transfer optimization computational fluid dynamics(CFD) measurement

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