Large-Eddy Simulation of an Axisymmetric Boundary Layer on a Body of Revolution

Zhou, Di; Wang, Kan; Wang, Meng

doi:10.2514/6.2020-2989

Cited by 11 publications

(11 citation statements)

References 19 publications

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“…The skin-friction estimates presented in table 1 are derived from large eddy simulations (LES) of the BOR flow by Zhou et al. (2020), and are discussed further in the Appendix.…”

Section: Resultsmentioning

confidence: 99%

“…First, comparisons of the mean surface pressure (presented in figure 7 of the companion paper BHAD), mean velocity profiles, turbulence statistics and spectra (in Zhou et al. 2020) suggest that the LES flow is dynamically similar to the experimentally realized flow. More significant are the comparisons of fluctuating wall-pressure spectrum shown in figure 13.…”

Section: Figure 13mentioning

confidence: 95%

“…The table also shows other parameters, including the displacement thickness δ 1 , the shape factor, the momentum-thickness Reynolds number Re δ 2 = U e δ 2 /ν, and the curvature parameter δ/r s , which are discussed in detail by BHAD. The skin-friction estimates presented in table 1 are derived from large eddy simulations (LES) of the BOR flow by Zhou et al (2020), and are discussed further in the Appendix.…”

Section: Flow Characteristics and Parametersmentioning

confidence: 99%

“…Also shown in green is the mean pressure distribution on the tail, with relevant vertical axis to the right. Dots represent the experimental data, the dashed line shows large eddy simulations estimates from Zhou, Wang & Wang (2020), and crosses show the potential flow simulation.…”

Section: Apparatus and Instrumentationmentioning

confidence: 99%

“…On using friction velocity from large eddy simulation Since friction velocity is a critical parameter associated with wall pressure, and since we do not have either direct measurements or any established hypothesis for APG flows, we rely on Reynolds-number-matched wall-resolved LES over the BOR (Zhou et al. 2020). While this seems to be a bold manoeuvre, detailed comparisons of the pressure and velocity statistics provide encouraging support.…”

Section: Figure 13mentioning

confidence: 99%

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Wall-pressure fluctuations in an axisymmetric boundary layer under strong adverse pressure gradient

2023

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Measurements of fluctuating wall pressure in a high-Reynolds-number flow over a body of revolution are described. With a strong axial pressure gradient and moderate lateral curvature, this non-equilibrium flow is relevant to marine applications as well as short-haul urban transportation. The wall-pressure spectrum and its scaling are discussed, along with its relation to the space–time structure. As the flow decelerates downstream, the root-mean-square level of the pressure drops together with the wall shear stress ( $\tau _w$ ) and is consistently approximately 7 $\tau _w$ . While the associated dimensional spectra see a broadband reduction of over 15 dB per Hz, they appear to attain a single functional form, collapsing to within 2 dB when normalized with the wall-wake scaling where $\tau _w$ is the pressure scale and $U_e/\delta$ is the frequency scale. Here, $\delta$ is the boundary layer thickness and $U_e$ is the local free-stream velocity. The general success of the wall-wake scaling, including in the viscous $f^{-5}$ region, suggests that the large-scale motions in the outer layer play a predominant role in the near-wall turbulence and wall pressure. On investigating further, we find that the instantaneous wall-pressure fluctuations are characterized by a quasi-periodic feature that appears to convect downstream at speeds consistent with the outer peak in the turbulence stresses. The conditional structure of this feature, estimated through peak detection in the time series, resembles that of a roller, supporting the embedded shear layer hypothesis (Schatzman & Thomas, J. Fluid Mech., vol. 815, 2017, pp. 592–642; Balantrapu et al., J. Fluid Mech., vol. 929, 2021, A9). Therefore, the outer-region shear-layer-type motions may be important when devising strategies for flow control, drag and noise reduction for decelerating boundary layers.

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“…The skin-friction estimates presented in table 1 are derived from large eddy simulations (LES) of the BOR flow by Zhou et al. (2020), and are discussed further in the Appendix.…”

Section: Resultsmentioning

confidence: 99%

Section: Figure 13mentioning

confidence: 95%

Section: Flow Characteristics and Parametersmentioning

confidence: 99%

Section: Apparatus and Instrumentationmentioning

confidence: 99%

Section: Figure 13mentioning

confidence: 99%

See 3 more Smart Citations

Wall-pressure fluctuations in an axisymmetric boundary layer under strong adverse pressure gradient

2023

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Overview of Research Progress on Numerical Simulation Methods for Turbulent Flows Around Underwater Vehicles

He,

Pan,

Zhao

et al. 2024

J. Marine. Sci. Appl.

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In this paper, we present an overview of numerical simulation methods for the flow around typical underwater vehicles at high Reynolds numbers, which highlights the dominant flow structures in different regions of interest. This overview covers the forebody, midbody, stern, wake region, and appendages and summarizes flow phenomena, including laminar-to-turbulent transition, turbulent boundary layers, flow under the influence of curvatures, wake interactions, and all associated complex vortex structures. Furthermore, the current issues and challenges of capturing these flow structures are addressed. This overview provides a deep insight into the use of numerical simulation methods, including the Reynolds-averaged Navier–Stokes (RANS) method, large eddy simulation (LES) method, and the hybrid RANS/LES method, and evaluates their applicability in capturing detailed flow features.

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A cache-efficient reordering method for unstructured meshes with applications to wall-resolved large-eddy simulations

Liu

Wang

et al. 2023

Journal of Computational Physics

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Large-Eddy Simulation of an Axisymmetric Boundary Layer on a Body of Revolution

Cited by 11 publications

References 19 publications

Wall-pressure fluctuations in an axisymmetric boundary layer under strong adverse pressure gradient

Wall-pressure fluctuations in an axisymmetric boundary layer under strong adverse pressure gradient

Overview of Research Progress on Numerical Simulation Methods for Turbulent Flows Around Underwater Vehicles

A cache-efficient reordering method for unstructured meshes with applications to wall-resolved large-eddy simulations

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