Effect of convective schemes in wall-resolved and wall-modeled LES of compressible wall turbulence

Vanna, Francesco De; Baldan, Giacomo; Picano, Francesco; Benini, Ernesto

doi:10.1016/j.compfluid.2022.105710

Cited by 18 publications

(7 citation statements)

References 51 publications

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“…At the streamwise station with the friction Reynolds number Re τ of approximately 1000, the grid resolution in the streamwise and spanwise directions are x + ≈ 20 and z + ≈ 10, and the first grid distance off the wall being y + w ≈ 0.7 (refer to table 1), satisfying the requirement of LES. Such a method has been proven to be capable of providing acceptable results under the presently considered Re τ , grid intervals and numerical schemes (De Vanna et al 2023).…”

Section: Observation: Abatement Of Turbulent Intensities and Vlsmsmentioning

confidence: 99%

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Characterization of very-large-scale motions in supersonic and hypersonic turbulent boundary layers

Yu,

Dong,

Guo

et al. 2024

J. Fluid Mech.

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Very-large-scale motions are commonly observed in moderate- and high-Reynolds-number wall turbulence, constituting a considerable portion of the Reynolds stress and skin friction. This study aims to investigate the behaviour of these motions in high-speed and high-Reynolds-number turbulent boundary layers at varying Mach numbers. With the aid of high-precision numerical simulations, numerical experiments and theoretical analysis, it is demonstrated that the very-large-scale motions are weakened in high-Mach-number turbulence at the same friction Reynolds numbers, leading to the reduction in turbulent kinetic energy in the outer region. Conversely, the lower wall temperature enhances the very-large-scale motions but shortens the scale separation between the structures in the near-wall and outer regions.

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Section: Observation: Abatement Of Turbulent Intensities and Vlsmsmentioning

confidence: 99%

“…Such a method has been proven to be capable of providing acceptable results under the presently considered , grid intervals and numerical schemes (De Vanna et al. 2023).…”

Section: Observation: Abatement Of Turbulent Intensities and Vlsmsmentioning

confidence: 99%

Characterization of very-large-scale motions in supersonic and hypersonic turbulent boundary layers

Yu,

Dong,

Guo

et al. 2024

J. Fluid Mech.

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show abstract

“…However, this will introduce nonphysical phenomena, which require a transition distance to recover a well-behaved turbulent flow. The much higher grid resolution is needed for the WMLES behavior to forecast anisotropy turbulence in near-wall dynamics [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Modified Shielding and Rapid Transition DDES Model for Separated Flows

Lei

Yang

Zheng

et al. 2023

Entropy

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In this paper, the major problems associated with detached eddy simulation (DES) (namely, modeled stress depletion (MSD) and slowing of the RANS to LES transition (RLT)) are discussed and reviewed, and relevant improvements are developed. A modified version for the delayed DES (DDES) method with adaptive modified adequate shielding and rapid transition is proposed; this is called MSRT DDES. The modified shielding strategy can be adjusted adaptively according to the local flow conditions: keeping the RANS behavior in the whole boundary layer when there is no resolved turbulence, and weakening the shielding function when resolved turbulence exists in the mainstream over the boundary layer. This strategy can significantly ameliorate the MSD in the RANS boundary layer, regardless of the mesh refinement, and avoid excessive shielding in the fully developed resolved turbulence that may otherwise delay the development of the separated and reattached flow. Three cases are designed to test the modified DDES, namely, complete shielding in the RANS zone of a boundary layer (the zero-pressure gradient turbulent boundary layer with the refined mesh), modified adaptive improved shielding with a rapid transition (the flow over a hump), and the overall performance in a complex 3D separation (the corner separation in a compressor cascade). The results show that the modified shielding function is more physical than earlier proposals compared to shielding functions, and according to detailed comparisons of the wall skin friction coefficients, velocity profiles, total pressure-loss coefficients, entropy production analyses, and so on, the MSD and RLT problems are moderately alleviated by the MSRT DDES.

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“…Numerical simulation methods such as these, with a high precision and high computation, are used to calculate the density field to analyze the aero-optical effects, which cannot satisfy the requirement of rapidity when conducting aero-optical engineering research at the aircraft design stage. Although some scholars have improved various numerical methods based on hydrodynamics [ 21 ], in terms of the aero-optical effects, we mainly focus on the optical properties of the flow field. Therefore, it is necessary to find a quick simulation method for the aero-optical effects expected for the research method based on CFD.…”

Section: Introductionmentioning

confidence: 99%

A Quick Simulation Method for Aero-Optical Effects Based on a Density Proxy Model

Yang

Liu

et al. 2023

Sensors

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Aero-optical effects caused by high-speed flow fields will interfere with the transmission of starlight, reduce the accuracy of optical sensors, and affect the application of celestial navigation on hypersonic vehicles. At present, the research of aero-optical effects relies heavily on the flow field simulation of computational fluid dynamics (CFD), which requires a great deal of computing resources and time, and cannot satisfy the demand of the rapid analysis of aero-optical effects in the engineering design stage. Therefore, a quick simulation method for aero-optical effects based on a density proxy model (DP-AOQS) is proposed in this paper. A proxy model of the turbulent density field is designed to replace the density field in the CFD simulation, and the proxy model is parametrically calibrated to simulate the optical characteristics of the turbulent boundary layer (TBL) in the external flow field of the optical window. The performance of DP-AOQS in the visible light band is verified from the perspectives of density field distribution, optical path difference (OPD), and fuzzy star map. The simulation results show that the method can quickly provide the distortion results of aero-optical effects in different flight conditions on the premise of ensuring the simulation accuracy. The research in this paper provides a new analytical method for the study of aero-optical effects.

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Effect of convective schemes in wall-resolved and wall-modeled LES of compressible wall turbulence

Cited by 18 publications

References 51 publications

Characterization of very-large-scale motions in supersonic and hypersonic turbulent boundary layers

Characterization of very-large-scale motions in supersonic and hypersonic turbulent boundary layers

A Modified Shielding and Rapid Transition DDES Model for Separated Flows

A Quick Simulation Method for Aero-Optical Effects Based on a Density Proxy Model

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