scholarly journals Large eddy simulation of flow structure in the near region of a circular wall jet

2012 ◽  
Vol 31 ◽  
pp. 713-722 ◽  
Author(s):  
Zhi-wei Li ◽  
Wen-xin Huai ◽  
Zhong-dong Qian
Keyword(s):  
Large Eddy Simulation ◽  
Flow Structure ◽  
Wall Jet ◽  
Eddy Simulation ◽  
Large Eddy

Computation of Aerial Towed Cable Aerodynamic Performances with Large Eddy Simulation

2011 ◽  
Vol 105-107 ◽  
pp. 606-610
Author(s):  
Wei Han ◽  
Xiao Wei Kang ◽  
Yun Liang Wang ◽  
Xiao Hong Zheng
Keyword(s):  
Large Eddy Simulation ◽  
Flow Structure ◽  
Scale Model ◽  
Aerodynamic Forces ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Aerodynamic Performances ◽  
Long Time ◽  
Towed Cable ◽  
Dynamics Characteristic

The dynamics characteristic of aerial towed cable has been investigated with many models. Because of the coupling between the components of the towed cable system, the dynamics of the towed cable is complex and nonlinear. Though the aerodynamic performances of cable is studied for a long time, the results are quiet different with researchers. The ideal method to obtain the aerodynamic forces is to simulate the flow structure around the towed cable.The purposes of this paper are to simulate the flow field of the towed cable with the different inclined angles by using Large Eddy Simulation (LES) with sub-grid scale model of Smagorinsky-Lily and to study the variation of the aerodynamic forces and its influences on flow structure. The results show that the LES can predict the flow structure of the cable reasonably.

Large-Eddy Simulation of Buoyancy-Induced Flow in a Sealed Rotating Cavity

2018 ◽  
Author(s):  
Diogo B. Pitz ◽  
John W. Chew ◽  
Olaf Marxen
Keyword(s):  
Large Eddy Simulation ◽  
Boundary Layers ◽  
Flow Structure ◽  
Flow Characteristics ◽  
Global Features ◽  
Eddy Simulation ◽  
Rotating Cavity ◽  
Large Eddy ◽  
Induced Flow ◽  
Buoyancy Induced Flow

Buoyancy-induced flows occur in the rotating cavities of gas turbine internal air systems, and are particularly challenging to model due to their inherent unsteadiness. While the global features of such flows are well documented, detailed analyses of the unsteady structure and turbulent quantities have not been reported. In this work we use a high-order numerical method to perform large-eddy simulation (LES) of buoyancy-induced flow in a sealed rotating cavity with either adiabatic or heated disks. New insight is given into long-standing questions regarding the flow characteristics and nature of the boundary layers. The analyses focus on showing time-averaged quantities, including temperature and velocity fluctuations, as well as on the effect of the centrifugal Rayleigh number on the flow structure. Using velocity and temperature data collected over several revolutions of the system, the shroud and disk boundary layers are analysed in detail. The instantaneous flow structure contains pairs of large, counter-rotating convection rolls, and it is shown that unsteady laminar Ekman boundary layers near the disks are driven by the interior flow structure. The shroud thermal boundary layer scales as approximately Ra−1/3, in agreement with observations for natural convection under gravity.

238 Large Eddy Simulation of a Mixing Tee Junction, Wall Jet type configuration

2003 ◽  
Vol 2003.16 (0) ◽  
pp. 165-166
Author(s):  
Philippe EMONOT ◽  
Akira YAMAGUCHI ◽  
Hideki KAMIDE ◽  
Minoru IGARASHI
Keyword(s):  
Large Eddy Simulation ◽  
Wall Jet ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Tee Junction
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