Turbulent flow around a wall-mounted cube: A direct numerical simulation

Yakhot, Alexander; Li, Heping; Nikitin, N.

doi:10.1016/j.ijheatfluidflow.2006.02.026

Cited by 137 publications

(111 citation statements)

References 25 publications

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“…In this figure, there are six longitudinal vortices or three vortex pairs. The wall-normal vortices are also shown in Figure 7(b) and they occur in the form of twin vortices due to separation just behind the plate, which is reported in many studies dealing with fluid flow around rectangular obstacles [27,28]. The pair-II vortices may have their roots in this wall-normal vortex pair.…”

Section: Influence On Time-averaged Vortex Structuresmentioning

confidence: 53%

Effect of Fluid Viscoelasticity on Turbulence and Large-Scale Vortices behind Wall-Mounted Plates

Tsukahara

Tanabe

Kawaguchi

2014

Advances in Mechanical Engineering

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Direct numerical simulations of turbulent viscoelastic fluid flows in a channel with wall-mounted plates were performed to investigate the influence of viscoelasticity on turbulent structures and the mean flow around the plate. The constitutive equation follows the Giesekus model, valid for polymer or surfactant solutions, which are generally capable of reducing the turbulent frictional drag in a smooth channel. We found that turbulent eddies just behind the plates in viscoelastic fluid decreased in number and in magnitude, but their size increased. Three pairs of organized longitudinal vortices were observed downstream of the plates in both Newtonian and viscoelastic fluids: two vortex pairs were behind the plates and the other one with the longest length was in a plate-free area. In the viscoelastic fluid, the latter vortex pair in the plate-free area was maintained and reached the downstream rib, but its swirling strength was weakened and the local skin-friction drag near the vortex was much weaker than those in the Newtonian flow. The mean flow and small spanwise eddies were influenced by the additional fluid force due to the viscoelasticity and, moreover, the spanwise component of the fluid elastic force may also play a role in the suppression of fluid vortical motions behind the plates.

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Section: Influence On Time-averaged Vortex Structuresmentioning

confidence: 53%

Effect of Fluid Viscoelasticity on Turbulence and Large-Scale Vortices behind Wall-Mounted Plates

Tsukahara

Tanabe

Kawaguchi

2014

Advances in Mechanical Engineering

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“…Since the turbulence model calculates only the cross tensor term of Reynolds stress explicitly, only these values (u w ) are compared with available DNS data [52] in Fig. 6.…”

Section: Quantitative Resultsmentioning

confidence: 99%

A CFD-based wind solver for an urban fast response transport and dispersion model

et al. 2011

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In many cities, ambient air quality is deteriorating leading to concerns about the health of city inhabitants. In urban areas with narrow streets surrounded by clusters of tall buildings, called street canyons, air pollution from traffic emissions and other sources may accumulate resulting in high pollutant concentrations. For various situations, including the evacuation of populated areas in the event of an accidental or deliberate release of chemical, biological and radiological agents, it is important that models should be developed that produce urban flow fields quickly. Various computational techniques have been used to calculate these flow fields, but these techniques are often computationally intensive. Most fast response models currently in use are at a disadvantage in these cases as they are unable to correlate highly heterogeneous urban structures with the diagnostic parameterizations on which they are based. In this paper, a novel variant of the popular projection method for solving the Navier-Stokes equations has been developed and applied to produce fast and reasonably accurate parallel computational fluid dynamics (CFD) solutions for flow in complex urban areas. This model, called QUIC-CFD represents an intermediate balance between fast (on the order of minutes for a several block problem) and reasonably accurate solutions. This paper details the solution procedure and validates this model for various simple and complex urban geometries.

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“…In particular, flow separation and recirculation are usually found near the surface and play an important role on the spatial distribution of turbulence kinetic energy (TKE) and turbulent fluxes of momentum and scalars. In order to obtain fundamental understanding on how turbulent boundarylayer flow is affected by the presence of bluff bodies, several studies have been conducted using both experiments and numerical simulations (e.g., Castro and Robins, 1977;Hunt et al, 1990;Hussein and Martinuzzi, 1996;Krajnović , 2009;Lim et al, 2009;Yakhot et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

Cheng

Porté‐Agel

2013

International Journal of Heat and Fluid Flow

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Turbulent flow around a wall-mounted cube: A direct numerical simulation

Cited by 137 publications

References 25 publications

Effect of Fluid Viscoelasticity on Turbulence and Large-Scale Vortices behind Wall-Mounted Plates

Effect of Fluid Viscoelasticity on Turbulence and Large-Scale Vortices behind Wall-Mounted Plates

A CFD-based wind solver for an urban fast response transport and dispersion model

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

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