Large Eddy Simulation of Flow Over a Flat-Window Cylindrical Turret with Passive Flow Control

2010 ◽  
Author(s):  
Philip Morgan ◽  
Miguel Visbal
Keyword(s):  
Large Eddy Simulation ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy

Large eddy simulation of base drag reduction using jet boat tail passive flow control

2020 ◽  
Vol 198 ◽  
pp. 104398 ◽  
Author(s):  
Yunchao Yang ◽  
William Bradford Bartow ◽  
Gecheng Zha ◽  
Heyong Xu ◽  
Jianlei Wang
Keyword(s):  
Large Eddy Simulation ◽  
Drag Reduction ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Base Drag

scholarly journals Large Eddy Simulation of Base Drag Reduction with Jet Boat-tail Passive Flow Control

2015 ◽  
Vol 126 ◽  
pp. 150-157 ◽  
Author(s):  
Yunchao Yang ◽  
Heyong Xu ◽  
Jianlei Wang ◽  
Gecheng Zha
Keyword(s):  
Large Eddy Simulation ◽  
Drag Reduction ◽  
Flow Control ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Base Drag

scholarly journals Large Eddy Simulation Exploration of Passive Flow Control Around an Ahmed Body

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Siniša Krajnović
Keyword(s):  
Flow Control ◽  
Control Mechanism ◽  
Streamwise Direction ◽  
Ground Vehicle ◽  
Longitudinal Vortices ◽  
Passive Flow Control ◽  
Eddy Simulation ◽  
Passive Flow ◽  
Large Eddy ◽  
Good Agreement

Large eddy simulations (LES) are used to study passive flow control for drag reduction in a simplified ground vehicle. Add-on devices in the form of short cylinders are used for the formation of streaks in the streamwise direction that lead to the separation delay. The results of the present numerical simulations are compared with the experimental data and show good agreement. The two-stage flow control mechanism is analyzed from the LES results. It was found to be in agreement with the previous experimental observations that the counter-rotating vortices behind the impinging devices influence the separation only indirectly through the longitudinal vortices further downstream.

Very Large Eddy Simulation of Passive Drag Control for a D-Shaped Cylinder

2013 ◽  
Vol 135 (10) ◽  
Author(s):  
Xingsi Han ◽  
Siniša Krajnović
Keyword(s):  
Large Eddy Simulation ◽  
Flow Control ◽  
Control Problem ◽  
Bluff Body ◽  
Numerical Study ◽  
Numerical Results ◽  
Complex Flow ◽  
Local Disturbance ◽  
Eddy Simulation ◽  
Large Eddy

The numerical study reported here deals with the passive flow control around a two-dimensional D-shaped bluff body at a Reynolds number of Re=3.6×104. A small circular control cylinder located in the near wake behind the main bluff body is employed as a local disturbance of the shear layer and the wake. 3D simulations are carried out using a newly developed very large eddy simulation (VLES) method, based on the standard k − ε turbulence model. The aim of this study is to validate the performance of this method for the complex flow control problem. Numerical results are compared with available experimental data, including global flow parameters and velocity profiles. Good agreements are observed. Numerical results suggest that the bubble recirculation length is increased by about 36% by the local disturbance of the small cylinder, which compares well to the experimental observations in which the length is increased by about 38%. A drag reduction of about 18% is observed in the VLES simulation, which is quite close to the experimental value of 17.5%. It is found that the VLES method is able to predict the flow control problem quite well.

Large Eddy Simulation of Active Flow Control Over SD7003 at Reynolds Number of 60,000

2020 ◽  
Author(s):  
Djavad Kamari ◽  
Mehran Tadjfar ◽  
Ali Tarokh
Keyword(s):  
Reynolds Number ◽  
Large Eddy Simulation ◽  
Flow Control ◽  
Turbulent Viscosity ◽  
Active Flow Control ◽  
Smagorinsky Model ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Active Flow

Abstract Large Eddy Simulation for active flow control (AFC) by employing synthetic and continuous blowing is done to investigate their effects on resizing separation. The flow around an SD7003 airfoil at Reynolds number of 60,000 and angles of attack of 13° is considered where a widespread separation occurs at post stall. In this work, the Dynamic Smagorinsky model is used as to calculate the turbulent viscosity.

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