Large-eddy simulation of vortex breakdown in compressible swirling jet flow

2008 ◽  
Vol 37 (7) ◽  
pp. 844-856 ◽  
Author(s):  
S.B. Müller ◽  
L. Kleiser
Keyword(s):  
Large Eddy Simulation ◽  
Vortex Breakdown ◽  
Jet Flow ◽  
Eddy Simulation ◽  
Swirling Jet ◽  
Large Eddy

Large eddy simulation of turbulent axially rotating pipe and swirling jet flows

2015 ◽  
Vol 231 (9) ◽  
pp. 1749-1761 ◽  
Author(s):  
Nicolas D Castro ◽  
Ayodeji O Demuren
Keyword(s):  
Large Eddy Simulation ◽  
Reynolds Stress ◽  
Pipe Flow ◽  
Flow Simulation ◽  
Jet Flow ◽  
Potential Core ◽  
Stress Anisotropy ◽  
Eddy Simulation ◽  
Swirling Jet ◽  
Large Eddy

Fully-developed, turbulent rotating pipe flow and swirling jet flow, emitted from the pipe, into open quiescent ambient are investigated numerically using large eddy simulation. Simulations are performed at various rotation rates and Reynolds numbers. Time-averaged large eddy simulation results are compared to experimental and simulation data from previous studies. Pipe flow results show deformation of the turbulent mean axial velocity profile towards the laminar-type Poiseuille profile, with increased rotation. The Reynolds stress anisotropy tensor experiences a component-level redistribution due to pipe rotation. Turbulent energy is transferred from the axial component to the tangential component as rotation is increased. The Reynolds stress anisotropy invariant map also shows a movement away from the one-component limit in the buffer layer, with increased rotation. Exit conditions for the pipe flow simulation are utilized as inlet conditions for the jet flow simulation. Jet flow without swirl and at a swirl rate of S = 0.5 are investigated. Swirl is observed to change the characteristics of the jet flow field, leading to increased jet spread and velocity decay, and a corresponding decrease in the length of the jet potential core. The Reynolds stress anisotropy invariant map shows that the turbulent stress field, with or without rotation straddles the axi-symmetric limit.

Large-Eddy Simulation and Experimental Observation of Combustion-Induced Vortex Breakdown

2010 ◽  
Vol 182 (4-6) ◽  
pp. 505-516 ◽  
Author(s):  
E. Tangermann ◽  
M. Pfitzner ◽  
M. Konle ◽  
T. Sattelmayer
Keyword(s):  
Large Eddy Simulation ◽  
Experimental Observation ◽  
Vortex Breakdown ◽  
Eddy Simulation ◽  
Large Eddy

Large-Eddy Simulation of a Swirl-Stabilized, Lean Direct Injection Spray Combustor

2006 ◽  
Author(s):  
Mehmet Kırtas¸ ◽  
Nayan Patel ◽  
Vaidyanathan Sankaran ◽  
Suresh Menon
Keyword(s):  
Large Eddy Simulation ◽  
Vortex Breakdown ◽  
Direct Injection ◽  
Reacting Flow ◽  
Mean Velocity ◽  
Recirculation Bubble ◽  
Lean Direct Injection ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Recirculation Zones

Large-eddy simulation (LES) of a lean-direct injection (LDI) combustor is reported in this paper. The full combustor and all the six swirl vanes are resolved and both cold and reacting flow simulations are performed. Cold flow predictions with LES indicate the presence of a broad central recirculation zone due to vortex breakdown phenomenon near the dump plane and two corner recirculation zones at the top and bottom corner of the combustor. These predicted features compare well with the experimental non-reacting data. Reacting case simulated a liquid Jet-A fuel spray using a Lagrangian approach. A three-step kinetics model that included CO and NO is used for the chemistry. Comparison of mean velocity field predicted in the reacting LES with experiments shows reasonable agreement. Comparison with the non-reacting case shows that the centerline recirculation bubble is shorter but more intense in the reacting case.

scholarly journals Large Eddy Simulation of isothermal cruciform jet flow: Preliminary results

2016 ◽  
Vol 8 ◽  
pp. 10-12 ◽  
Author(s):  
B.T. Kannan ◽  
P. Ssheshan ◽  
Sundararaj Senthilkumar
Keyword(s):  
Large Eddy Simulation ◽  
Jet Flow ◽  
Preliminary Results ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of a jet flow with a suction/ejection system using immersed boundary conditions

2010 ◽  
Vol 98 (10-11) ◽  
pp. 618-627 ◽  
Author(s):  
M. Salinas-Vázquez ◽  
W. Vicente ◽  
C. González-Rodríguez ◽  
E. Barrios-Bonilla ◽  
A. Espinosa-Gayosso
Keyword(s):  
Large Eddy Simulation ◽  
Boundary Conditions ◽  
Jet Flow ◽  
Immersed Boundary ◽  
Eddy Simulation ◽  
Large Eddy
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