Landing Gear Drag Reduction Using Lattice Boltzmann Method

2018 ◽  
Author(s):  
Pedro H. Caruy Povoa ◽  
Rodrigo M. Granzoto ◽  
Gilberto G. Becker ◽  
Mauro R. Lopez
Keyword(s):  
Drag Reduction ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Landing Gear ◽  
Boltzmann Method

Research on the mechanism of drag reduction by wall vibration through Lattice Boltzmann method

2020 ◽  
Vol 34 (27) ◽  
pp. 2050295
Author(s):  
Jia Zhen Zhao ◽  
Guang Pan ◽  
Shan Gao
Keyword(s):  
Drag Reduction ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Normal Vibration ◽  
Liquid Interface ◽  
Geometry Model ◽  
Vibration Parameters ◽  
Solid Liquid Interface ◽  
Boltzmann Method ◽  
Solid Liquid

In this paper, the hydrodynamics of streamwise and normal vibration wall are studied using the Lattice Boltzmann method. Firstly, based on the two-dimensional flow geometry model, which is made up of flat wall and water fluid, the characters of the fluid near the streamwise and normal vibration wall are simulated under the condition of mutative vibration parameters. By rigorous data treating, some notable results such as the velocity distribution, density distribution curves of the flow field, and the frictional force of the solid-liquid interface are gained. Secondly, the reason of the change of frictional resistance at the solid-liquid interface by wall vibration are studied. And the results are evidence that well drag reduction effect can be obtained by applying appropriate flow vibration parameters to the solid wall. In addition, the reduction in fluid density near the solid-liquid wall is another significant cause behind the frictional drag decrease.

Drag reduction in a channel with microstructure grooves using the lattice Boltzmann method

2017 ◽  
Vol 50 (10) ◽  
pp. 105301 ◽  
Author(s):  
M A Daeian ◽  
A Moosavi ◽  
A Nouri-Borujerdi ◽  
E Taghvaei
Keyword(s):  
Drag Reduction ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Boltzmann Method

Numerical Simulation of Drag Reduction in Microgrooved Substrates Using Lattice-Boltzmann Method

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
H. Asadzadeh ◽  
A. Moosavi ◽  
A. Etemadi
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Groove Depth ◽  
Friction Drag ◽  
Total Drag ◽  
Pressure Drag ◽  
Depth Ratio ◽  
Boltzmann Method

We study drag reduction of a uniform flow over a flat surface due to a series of rectangular microgrooves created on the surface. The results reveal that making grooves on the surface usually leads to the generation of secondary vortices inside the grooves that, in turn, decreases the friction drag force and increases the pressure drag force. By increasing the thickness of the grooves to the thickness of the obstacle, the pressure drag increases due to the enhancement of the generated vortices and the occurrence of separation phenomenon and the friction drag reduces due to a decrease of the velocity gradient on the surface. In addition, by increasing the grooves depth ratio, the pressure drag coefficient decreases and the friction drag coefficient increases. However, the impact of the pressure drag coefficient is higher than that of the friction drag coefficient. From a specific point, increasing the groove depth ratio does not effect on decreasing the total pressure drag of the plate. Therefore, creating the grooves in flat surfaces would reduce the total drag coefficient of the plate if the thickness of the grooves does not exceed a specific size and the depth of the grooves is chosen to be sufficiently large. The lattice-Boltzmann method (LBM) is used and the optimal reduction of the drag coefficient is calculated. It is found that for the width ratio equal to 0.19 and the groove depth ratio equal to 0.2548, about 7% decrease is achieved for the average total drag.

Sign in / Sign up

Export Citation Format

Share Document