Wall-Modeled and Hybrid Large-Eddy Simulations of the Flow over Roughness Strips

Salomone, Teresa; Piomelli, Ugo; Stefano, Giuliano De

doi:10.3390/fluids8010010

Cited by 9 publications

(4 citation statements)

References 41 publications

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“…Very importantly, both selected RANS and LES parts utilize the eddy-viscosity assumption (8), with τ ij representing either the Reynolds stresses in RANS or the SGS stresses in LES [31]. This way, the SBES formulation simplifies in the following blending procedure at the eddy-viscosity level:…”

Section: Stress-blended Eddy Simulationmentioning

confidence: 99%

Scale-Resolving Simulation of Shock-Induced Aerobreakup of Water Droplet

Rossano,

De Stefano

2024

Computation

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Two different scale-resolving simulation (SRS) approaches to turbulence modeling and simulation are used to predict the breakup of a spherical water droplet in air, due to the impact of a traveling plane shock wave. The compressible flow governing equations are solved by means of a finite volume-based numerical method, with the volume-of-fluid technique being employed to track the air–water interface on the dynamically adaptive mesh. The three-dimensional analysis is performed in the shear stripping regime, examining the drift, deformation, and breakup of the droplet for a benchmark flow configuration. The comparison of the present SRS results against reference experimental and numerical data, in terms of both droplet morphology and breakup dynamics, provides evidence that the adopted computational methods have significant practical potential, being able to locally reproduce unsteady small-scale flow structures. These computational models offer viable alternatives to higher-fidelity, more costly methods for engineering simulations of complex two-phase turbulent compressible flows.

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Section: Stress-blended Eddy Simulationmentioning

confidence: 99%

Scale-Resolving Simulation of Shock-Induced Aerobreakup of Water Droplet

Rossano,

De Stefano

2024

Computation

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“…The technique of targeted changes of boundary-layer characteristics by means of structured surfaces is not new, in principle. For example, the well-known riblets (longitudinal grooves used to reduce turbulent skin friction) [9], various two-dimensional humps and steps [10,11], and distributed roughness elements located near the attachment line, where CFVs start to grow, Refs [12,13] are examples of such structured reliefs.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Swept-Wing Laminar–Turbulent Flow in the Presence of Two-Dimensional Surface Reliefs

Boiko,

Kirilovskiy,

Poplavskaya

2024

Fluids

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Stochastization of boundary-layer flow has a dramatic effect on the aerodynamic characteristics of wings, nacelles, and other objects frequently encountered in practice, resulting in higher skin-friction drag and worse aerodynamic quality. A swept-wing boundary layer encountering a transition to turbulence in the presence of two-dimensional surface reliefs is considered. The relief has the form of strips of a rectangular cross-section oriented parallel to the leading edge and located at different distances from it. The computations are performed for the angle of attack of −5° and an incoming flow velocity of 30 m/s using the ANSYS Fluent 18.0 software together with the author’s LOTRAN 3 package for predicting the laminar–turbulent transition on the basis of the eN-method. New data on distributions of N factors of swept-wing cross-flow instability affected by the surface relief are presented. The data are of practical importance for engineering modeling of the transition. Also, the effectiveness of using the reliefs as a passive method of weakening the cross-flow instability up to 30% to delay the flow stochastization is shown.

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“…The Science of Making Torque from Wind (TORQUE 2024) Journal of Physics: Conference Series 2767 (2024) 022013 IOP Publishing doi:10.1088/1742-6596/2767/2/022013 10 adoption of a hybrid RANS/LES approach for further research (see [22] for a review). One example considered is the wall-modeled hybrid RANS/LES used in [23].…”

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confidence: 99%

Numerical analysis of static and dynamic wind turbine airfoil characteristics in transonic flow

Vitulano,

De Tavernier,

De Stefano

et al. 2024

J. Phys.: Conf. Ser.

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This study performed an aerodynamic characterization of the FFA-W3-211 wind turbine tip airfoil in transonic flow using Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations, for both steady and dynamic operational conditions. First, the boundary between subsonic and supersonic flow in static conditions was identified, depending on the angle of attack, the approach flow Mach number, and the Reynolds number. The analysis points out that higher Reynolds numbers promote the occurrence of local supersonic flow. Thereafter, to investigate the dynamic behavior in the transonic flow regime, a sinusoidal pitching motion with representative values was imposed. A hysteresis, similar to but distinct from dynamic stall, was observed for entering and leaving the supersonic and subsonic regions. Elevated reduced frequencies widened the hysteresis loop, resulting in increased normal forces on the airfoil. The study indicated that an increase in reduced frequency leads to an earlier onset of transonic flow. In conclusion, the risk of transonic flow occurring during normal operation of the next generation wind turbines predicted in earlier studies could be corroborated. Moreover, dynamic effects and Reynolds number dependencies can be significant.

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Wall-Modeled and Hybrid Large-Eddy Simulations of the Flow over Roughness Strips

Cited by 9 publications

References 41 publications

Scale-Resolving Simulation of Shock-Induced Aerobreakup of Water Droplet

Scale-Resolving Simulation of Shock-Induced Aerobreakup of Water Droplet

Numerical Simulation of Swept-Wing Laminar–Turbulent Flow in the Presence of Two-Dimensional Surface Reliefs

Numerical analysis of static and dynamic wind turbine airfoil characteristics in transonic flow

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