Direct numerical simulation of the flow around a rectangular cylinder at a moderately high Reynolds number

Cimarelli, Andrea; Leonforte, Adriano; Angeli, Diego

doi:10.1016/j.jweia.2017.12.020

Cited by 41 publications

(79 citation statements)

References 30 publications

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“…The Reynolds number Re = U ∞ D/ν is based on U ∞ , D and the kinematic viscosity ν of the fluid. As in the reference DNS work (Cimarelli et al 2018b), the value of the Reynolds number considered here is Re = 3000. The incompressible Navier-Stokes equations are:…”

Section: Numerical Methods and Computational Proceduresmentioning

confidence: 99%

“…When compared to the computational domain used in Cimarelli et al (2018b), i.e. −37.5 ≤ x ≤ 74.5 and −25 ≤ y ≤ 25, the present domain is slightly smaller, but discretized with a significantly finer mesh.…”

Section: Numerical Methods and Computational Proceduresmentioning

confidence: 99%

“…In such scenario of highly scattered experimental and numerical information, a remarkable achievement was the recent first Direct Numerical Simulation (DNS) of the BARC flow in the turbulent regime. It was presented by Cimarelli et al (2018b), who employed the finitevolumes OpenFOAM toolbox (Weller et al 1998), and was then used in the derivative works (Cimarelli et al 2018a(Cimarelli et al , 2019. Albeit at a relatively low value of Re, these data represent a key step towards building a robust information set for the BARC flow, since DNS has the ability to remove from the picture the uncertainties related to turbulence modeling.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Turbulent Flow over the BARC Rectangular Cylinder: A DNS Study

Chiarini

Quadrio

2021

Flow Turbulence Combust

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A direct numerical simulation (DNS) of the incompressible flow around a rectangular cylinder with chord-to-thickness ratio 5:1 (also known as the BARC benchmark) is presented. The work replicates the first DNS of this kind recently presented by Cimarelli et al. (J Wind Eng Ind Aerodyn 174:39–495, 2018), and intends to contribute to a solid numerical benchmark, albeit at a relatively low value of the Reynolds number. The study differentiates from previous work by using an in-house finite-differences solver instead of the finite-volumes toolbox OpenFOAM, and by employing finer spatial discretization and longer temporal average. The main features of the flow are described, and quantitative differences with the existing results are highlighted. The complete set of terms appearing in the budget equation for the components of the Reynolds stress tensor is provided for the first time. The different regions of the flow where production, redistribution and dissipation of each component take place are identified, and the anisotropic and inhomogeneous nature of the flow is discussed. Such information is valuable for the verification and fine-tuning of turbulence models in this complex separating and reattaching flow.

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Section: Numerical Methods and Computational Proceduresmentioning

confidence: 99%

Section: Numerical Methods and Computational Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Turbulent Flow over the BARC Rectangular Cylinder: A DNS Study

Chiarini

Quadrio

2021

Flow Turbulence Combust

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“…After the average reattachment point for x > x r , the flow evolves in a downstream boundary layer and finally detaches at the trailing edge thus forming a third recirculating region hereafter called wake vortex, see cyan lines in figure 2(a). Further details can be found in Cimarelli et al (2018).…”

Section: Mean Flow Featuresmentioning

confidence: 99%

On the structure of the self-sustaining cycle in separating and reattaching flows

2018

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The separating and reattaching flows and the wake of a finite rectangular plate are studied by means of direct numerical simulation data. The large amount of information provided by the numerical approach is exploited here to address the multi-scale features of the flow and to assess the self-sustaining mechanisms that form the basis of the main unsteadinesses of the flows. We first analyse the statistically dominant flow structures by means of three-dimensional spatial correlation functions. The developed flow is found to be statistically dominated by quasi-streamwise vortices and streamwise velocity streaks as a result of flow motions induced by hairpin-like structures. On the other hand, the reverse flow within the separated region is found to be characterized by spanwise vortices. We then study the spectral properties of the flow. Given the strongly inhomogeneous nature of the flow, the spectral analysis has been conducted along two selected streamtraces of the mean velocity field. This approach allows us to study the spectral evolution of the flow along its paths. Two well-separated characteristic scales are identified in the near-wall reverse flow and in the leading-edge shear layer. The first is recognized to represent trains of small-scale structures triggering the leading-edge shear layer, whereas the second is found to be related to a very large-scale phenomenon that embraces the entire flow field. A picture of the self-sustaining mechanisms of the flow is then derived. It is shown that very-large-scale fluctuations of the pressure field alternate between promoting and suppressing the reverse flow within the separation region. Driven by these large-scale dynamics, packages of small-scale motions trigger the leading-edge shear layers, which in turn created them, alternating in the top and bottom sides of the rectangular plate with a relatively long period of inversion, thus closing the self-sustaining cycle.

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“…Cimarelli et al [11] have worked on 1/5 rectangular prism at 3000 Reynold number. They solved their problem with direct numerical simulation of the finite volume method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Incompressible Forced Convection in a Channel with a Rectangular Prism

Ozsaban

Aslan

Güven

2020

Sakarya University Journal of Science

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The aim of the present study is to investigate the effects of the rectangular prism on forced convection in a channel with the Lattice Boltzmann Method (LBM). In this context, numerical analysis of steady and unsteady incompressible flow and heat transfer has been done in a twodimensional straight parallel channel. Momentum and energy transport are modelled with LBM. This study is used as a single relaxation time rule with a uniform square lattice structure. Different Reynolds numbers (50 and 1000) and constant Prandtl number value (0.7) have been investigated. In this study Nusselt number has been calculated for channel flow with rectangular prism and it was compared with an empty channel. Streamlines and isotherms were presented for the above-mentioned cases. LBM results were validated by commercial CFD code with the same conditions. It is found from results that Nusselt number with a rectangular prism in a channel was increased and the flow goes to transient form at Re=1000. Also, LBM code results are similar accuracy with commercial CFD code.

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Direct numerical simulation of the flow around a rectangular cylinder at a moderately high Reynolds number

Cited by 41 publications

References 30 publications

The Turbulent Flow over the BARC Rectangular Cylinder: A DNS Study

The Turbulent Flow over the BARC Rectangular Cylinder: A DNS Study

On the structure of the self-sustaining cycle in separating and reattaching flows

Numerical Investigation of Incompressible Forced Convection in a Channel with a Rectangular Prism

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