Assessment of the wall-adapting local eddy-viscosity model in transitional boundary layer

Kim, Minwoo; Lim, Jiseop; Kim, Seungtae; Jee, Solkeun; Park, Donghun

doi:10.1016/j.cma.2020.113287

Cited by 39 publications

(12 citation statements)

References 35 publications

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“… Note that there is no distinction between and in the computation of laminar flow because LES is essentially DNS in this case (Kim et al. 2019, 2020). The residual part is a turbulence fluctuation, so in the pre-transition region where the deterministic disturbance (see (2.1)) is well resolved with the current fine grid.…”

Section: Methodsmentioning

confidence: 99%

“…The model coefficient is as suggested in Nicoud & Ducros (1999) and tested in the transitional boundary layer in Kim et al. (2019, 2020). The sub-grid-scale turbulence model is judiciously chosen for wall-resolved LES in the transitional boundary layer (Kim et al.…”

Section: Methodsmentioning

confidence: 99%

“…2012 a ) and numerical investigation (El-Hady 1988; Nayfeh & Masad 1990; Bertolotti, Herbert & Spalart 1992; Joslin, Streett & Chang 1993; Xu, Lombard & Sherwin 2017; Jee, Joo & Lin 2018; Kim et al. 2019, 2020). The current study focuses on the subharmonic resonance in the natural transition path for incompressible flow.…”

Section: Introductionmentioning

confidence: 99%

“…The authors have developed an LES method coupled with stability analysis (Kim et al. 2019, 2020; Lim et al. 2021) for a cost-effective and high-fidelity simulation of a transitional boundary layer.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that the current LES approach (Kim et al. 2019, 2020) provides direct numerical simulation (DNS) fidelity in the laminar region where disturbances are deterministic.…”

Section: Introductionmentioning

confidence: 99%

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Effects of phase difference between instability modes on boundary-layer transition

Kim

Lim

et al. 2021

J. Fluid Mech.

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Phase effect on the modal interaction of flow instabilities is investigated for laminar-to-turbulent transition in a flat-plate boundary-layer flow. Primary and secondary three-dimensional (3-D) oblique waves at various initial phase differences between these two instability modes. Three numerical methods are used for a systematic approach for the entire transition process, i.e. before the onset of transition well into fully turbulent flow. Floquet analysis predicts the subharmonic resonance where a subharmonic mode locally resonates for a given basic flow composed of the steady laminar flow and the fundamental mode. Because Floquet analysis is limited to the resonating subharmonic mode, nonlinear parabolised stability equation analysis (PSE) is conducted with various phase shifts of the subharmonic mode with respect to the given fundamental mode. The application of PSE offers insights on the modal interaction affected by the phase difference up to the weakly nonlinear stage of transition. Large-eddy simulation (LES) is conducted for a complete transition to turbulent boundary layer because PSE becomes prohibitively expensive in the late nonlinear stage of transition. The modulation of the subharmonic resonance with the initial phase difference leads to a significant delay in the transition location up to $\Delta Re_{x, tr} \simeq 4\times 10^5$ as predicted by the current LES. Effects of the initial phase difference on the spatial evolution of the modal shape of the subharmonic mode are further investigated. The mechanism of the phase evolution is discussed, based on current numerical results and relevant literature data.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…It should be noted that the current LES approach (Kim et al. 2019, 2020) provides direct numerical simulation (DNS) fidelity in the laminar region where disturbances are deterministic.…”

Section: Introductionmentioning

confidence: 99%

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