Large-eddy simulation of a spatially-evolving supersonic turbulent boundary layer at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si132.gif" display="inline" id="mml132" overflow="scroll"><mml:msub><mml:mrow><mml:mi>M</mml:mi></mml:mrow><mml:mrow><mml:mi>∞</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:math>

Shadloo, Mostafa Safdari; Hadjadj, A.; Chaudhuri, A.; Ben-Nasr, O.

doi:10.1016/j.euromechflu.2017.09.005

Cited by 12 publications

(3 citation statements)

References 33 publications

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“…The exact solution of momentum equations called direct numerical simulation (DNS) requires high computational cost and resources (Ducoin et al , 2017; Méndez et al , 2018; Piquet et al , 2019). Although the large eddy simulation (LES) method (Ben-Nasr et al , 2017; Benard et al , 2016; Shadloo et al , 2018; Shi et al , 2001; Tajallipour et al , 2013; Zhang, 2014) reduces this cost, in comparison, the Reynolds-averaged Navier–Stokes (RANS) turbulence models are very low cost and accurate at the same time. This comparison between the two mentioned models is indicated as the results achieved by Afgan et al (2013) on investigating the experimental results of Bahaj et al (2007).…”

Section: Numerical Methodologymentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Study of horizontal axis tidal turbine performance and investigation on the optimum fixed pitch angle using CFD

Amiri

Shafaghat

Alamian

et al. 2019

HFF

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Purpose The purpose of this paper is to design, investigate and optimize a horizontal axis tidal turbine (HATT) using computer-aided numerical simulation and computational fluid dynamics (CFD). This is the first step of research and development (R&D) for implementation in the Persian Gulf condition. To do so, suitable locations are reviewed. Then, the optimization is focused on determining the optimum fixed pitch angle (β) of a three-bladed HATT based on the widespread multiple reference frame (MRF) technique to calculate power and thrust coefficients at different operational rotating speeds. Design/methodology/approach To simplify the problem and reducing the computational costs due to cyclic symmetry only one blade, accordingly one-third of the whole computational domain is considered in the modeling. Due to flow’s nature involving rotating, separation and recirculation, a realizable κ-ε turbulence model with standard wall function is selected to capture flow characteristics influenced by the rotor and near the wall region. Simulations are conducted for two free-stream velocities, then compared with their dependencies through the dimensionless tip speed ratio (TSR) parameter. Findings The validation process of the simulations is carried out by the use of AeroDyn BEM code, which has been evaluated by comparing with two experimental data. As results, the highest coefficient of power is achieved at ß = 19.3° at TSR = 4 with the value around 0.41 and 0.816 for thrust coefficient. Furthermore, to comprehend the rotor’s performance and simulation method, flow characteristics due to the rise in angular velocity is discussed in detail. Moreover, the major phenomenon, cavitation occurrence, is also checked at the critical situation where it is found to be safe. Originality/value By comparing and evaluating the results to other HATTs, it implies that the proposed rotor of this study is feasible and proved by CFD evaluation at this step. However, the current rotor is awaiting a justification through experimental assessment.

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Section: Numerical Methodologymentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Study of horizontal axis tidal turbine performance and investigation on the optimum fixed pitch angle using CFD

Amiri

Shafaghat

Alamian

et al. 2019

HFF

View full text Add to dashboard Cite

show abstract

“…The convective fluxes are discretized using conservative skew-symmetric split-centered formulation. The viscous fluxes are discretized using the fourth order compact central differences scheme [14]. Time advancement is assessed by a standard explicit fourth-order Runge-Kutta algorithm.…”

Section: Computational Methodologymentioning

confidence: 99%

Effect of Lateral End Plates on Flow Crossing a Yawed Circular Cylinder

Liang

Duan

2019

Applied Sciences

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Numerical simulation is carried out to investigate the effect of the boundary condition of two lateral end-plate walls on the flow structure in the wake of a flow crossing a yawed circular cylinder. Two typical boundary conditions, nonslip and periodic, are investigated. It is revealed that the boundary condition of the two end-plates has a significant effect on the flow behaviors in the wake. Under the nonslip boundary condition, the vortex structure in the wake exhibits a tapering shape to the tip end. The flow pattern is formed in the wake as the streamlines on the tip side are becoming denser while the streamlines on the base end are becoming sparser. Spectral power analysis of the local lift coefficient shows that the frequency distribution exhibits axial variation. On the base side, the frequency distribution is broadband. On the tip side, there are two peak frequencies: the larger one corresponds to the value predicted by the independence principle, and the smaller one is generated by the secondary axial flow separation from the rear cylinder wall. Under the periodic condition, the numerical results show that organized Strouhal vortex is shed in the wake in the same way as to the flow orthogonally passing a cylinder and the independence principle is still applicable.

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Hybrid numerical method for wall-resolved large-eddy simulations of compressible wall-bounded turbulence

Liu

et al. 2022

Acta Mech. Sin.

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Large-eddy simulation of a spatially-evolving supersonic turbulent boundary layer atM∞=2

Cited by 12 publications

References 33 publications

Study of horizontal axis tidal turbine performance and investigation on the optimum fixed pitch angle using CFD

Study of horizontal axis tidal turbine performance and investigation on the optimum fixed pitch angle using CFD

Effect of Lateral End Plates on Flow Crossing a Yawed Circular Cylinder

Hybrid numerical method for wall-resolved large-eddy simulations of compressible wall-bounded turbulence

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