Role of secondary shear-layer vortices in the development of flow asymmetry on a cone–cylinder body at high angles of incidence

Kumar, Roopesh; Guha, Tufan K.; Kumar, Rajan

doi:10.1007/s00348-020-03045-y

Cited by 16 publications

(2 citation statements)

References 19 publications

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“…The influence of the shape of blocking fluid on the force of group fluid Based on the above settings of COMSOL Multiphysics 6.0, by analyzing steady flow, the results are presented in figure 2(b), which displays velocity distribution and contour maps for various bluff body shapes. Notably, after passing through cylinders of different shapes, fluids formed vortex shedding with periodic wake structures downstream [42,43]. Due to most flow induced vibrations, the lateral effect of the fluid on the bluff body is more obvious.…”

Section: Principle Of Energy Harvestersmentioning

confidence: 99%

The optimal design of wind-induced vibration energy harvester with microscale and high efficiency

Chen,

Bao,

Guan

et al. 2024

Eng. Res. Express

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In order to improve the performance of wind-induced vibration energy harvester (WIV-EH), the bluff body and cantilever beam play a significant role when the energy harvester works. In this paper, a WIV-EH model is designed to explore the factors affecting energy capture efficiency. In the Optimal design of bluff body, five kinds of bluff body is set to analyse the influence of the shape on the lift and lift coefficient by COMSOL Multiphysics 6.0. According to the simulation results, the D-shaped bluff body is optimized by changing the scale ratio and windward surface shape. In the Optimal design of cantilever beam, the result shows that under the same bluff body and wind speed, the shape of cantilever beam will affect the magnitude and distribution of strain. we also designed cantilever beams with different materials and splicing materials, and studied the response voltage output at different wind speeds. According to the above results, a wind tunnel test was designed for verification. The research results may provide new ideas for improving the energy harvesting efficiency of energy harvesters.

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Section: Principle Of Energy Harvestersmentioning

confidence: 99%

The optimal design of wind-induced vibration energy harvester with microscale and high efficiency

Chen,

Bao,

Guan

et al. 2024

Eng. Res. Express

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“…The asymmetric nature of the flow about slender bodies at high angles of attack has been widely described [6][7][8][9][10][11][12]. There is a global (temporal) or hydrodynamic instability above a certain angle of attack, where the flow achieves a bi-stable asymmetric flow pattern.…”

Section: Introductionmentioning

confidence: 99%

Fineness Ratio Effects on the Flow Past an Axisymmetric Body at High Incidence

Jiménez‐Varona

Liaño

2023

Aerospace

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The flow past an axisymmetric body at a sufficiently high angle of attack becomes asymmetric and unsteady. Several authors identified three different flow regions for bodies of large fineness ratio at low subsonic flow and high incidence: a steady region in the forebody and two unsteady regions in the rear body. Unsteady Reynolds Averaged Navier–Stokes (URANS) codes with eddy viscosity turbulence models or Reynolds stress turbulence models fail to capture the unsteady flow region. These methods are overly dissipative and resolve only frequencies far lower than turbulent fluctuations. Scale-Adaptive-Simulation (SAS) provides an alternative method to afford the problem of these massively separated flows at high Reynolds numbers without addressing the problem to Large Eddy Simulation (LES). This paper applies SAS to study the effect of slenderness on the flow. The numerical solutions show that the flow becomes more unstable as the fineness ratio increases, and the three flow regions are clearly recognizable. For low fineness ratios, only one of the two unsteady regions is visible. The good agreement between the sectional forces and pressure coefficients with their corresponding experimental data for an ogive-cylinder configuration allows an analysis of the flow structure with a fair degree of confidence.

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