Numerical Study of Thermal Protection Using Magnetohydrodynamic Flow Control in Mars Entry Flight

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.

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A numerical study on the flow control and pumping characteristics of a radial flow thermo-pneumatic micropump with electromagnetic resistance

International Journal of Precision Engineering and Manufacturing ◽

10.1007/s12541-012-0014-6 ◽

2012 ◽

Vol 13 (1) ◽

pp. 103-110 ◽

Cited By ~ 4

Author(s):

Se-Hong Oh ◽

Chang-Nyung Kim

Keyword(s):

Flow Control ◽

Radial Flow ◽

Numerical Study

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Mitigation of shock-induced flow separation using magnetohydrodynamic flow control

Sadhana ◽

10.1007/s12046-017-0610-3 ◽

2017 ◽

Vol 42 (3) ◽

pp. 379-390

Author(s):

R Balasubramanian ◽

K Anandhanarayanan ◽

R Krishnamurthy ◽

Debasis Chakraborty

Keyword(s):

Flow Control ◽

Flow Separation ◽

Magnetohydrodynamic Flow ◽

Induced Flow

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Gurney Flap Implementation on a DU91W250 Airfoil

Proceedings ◽

10.3390/proceedings2231448 ◽

2018 ◽

Vol 2 (23) ◽

pp. 1448 ◽

Cited By ~ 1

Author(s):

Iñigo Aramendia ◽

Aitor Saenz-Aguirre ◽

Unai Fernandez-Gamiz ◽

Ekaitz Zulueta ◽

Jose Manuel Lopez-Guede ◽

...

Keyword(s):

Flow Control ◽

Numerical Study ◽

Lift Coefficient ◽

Optimization Technique ◽

Electrical Power ◽

Aerodynamic Performance ◽

Control Element ◽

Mechanical Fatigue ◽

Gurney Flap ◽

Fatigue Loads

The increasing capability of Wind Turbine (WT) based power generation systems has derived in an increment of the WT rotor diameter, i.e., longer rotor blades. This results in an increase of the electrical power generated but also in instabilities in the operation of the WT, especially due to the mechanical fatigue loads generated in its elements. In this context, flow control has appeared as a solution to improve the aerodynamic performance of the blades. These devices not only increase lift coefficient but also reduce mechanical fatigue loads. This paper presents a detailed numerical analysis of the effects of placing a passive flow control element, a Gurney Flap (GF), in a DU91W250 airfoil. Moreover, a numerical study of the influence of the GF length on the aerodynamic performance of the blade has been carried out. This study is considered as a basis for the development of an optimization technique of the GF length for long WT blades.

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