Experiments on integral length scale control in atmospheric boundary layer wind tunnel

Varshney, Kapil; Poddar, Kamal

doi:10.1007/s00704-011-0415-y

Cited by 32 publications

(15 citation statements)

References 14 publications

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“…This inevitably leads to the formation of a boundary layer. Across this atmospheric boundary layer (ABL) or planetary boundary layer (PBL) which extends up to approximately 1 to 2 km in the atmosphere [261], the wind flow adjusts from the boundary conditions near the surface to the free flow conditions outside the boundary layer, in the free atmosphere. Figure 2.2 shows the structure of the atmospheric boundary layer and its different sublayers.…”

Section: Atmospheric Winds and The Atmospheric Boundary Layermentioning

confidence: 99%

“…The ABL can be further subdivided in two layers with distinct characteristics [72,162,261]. The lower region of the ABL near the earth's surface is called the surface layer and is dominated by friction and near-wall turbulence.…”

Section: Atmospheric Winds and The Atmospheric Boundary Layermentioning

confidence: 99%

“…In the more straightforward case of a neutral ABL, the time averaged horizontal velocity u(z) in the wind direction as a function of height can be represented in the form [25,71,261]: 14) where u τ ABL is the friction velocity, κ is the von Kármán constant and z 0 is the aerodynamic roughness length. The friction velocity represents the magnitude of the velocity fluctuations in the turbulent boundary layer and is defined as u τ ABL = τ w /ρ F where τ w is the wall shear stress at ground level and ρ F is the density of air.…”

Section: Mean Wind Velocity Profiles In the Homogeneous Neutral Atmosmentioning

confidence: 99%

See 2 more Smart Citations

Wind-structure interaction simulations of ovalling vibrations in silo groups

Hillewaere

Degroote

Lombaert

et al. 2015

Journal of Fluids and Structures

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Section: Atmospheric Winds and The Atmospheric Boundary Layermentioning

confidence: 99%

Section: Atmospheric Winds and The Atmospheric Boundary Layermentioning

confidence: 99%

Section: Mean Wind Velocity Profiles In the Homogeneous Neutral Atmosmentioning

confidence: 99%

See 1 more Smart Citation

Wind-structure interaction simulations of ovalling vibrations in silo groups

Hillewaere

Degroote

Lombaert

et al. 2015

Journal of Fluids and Structures

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“…Height of surface roughness elements was 27.5, 45.5 and 63.5 mm at the scales of 1:395, 1:236 and 1:208, respectively. In general, experimental hardware in each configuration was preliminarily designed in accordance with Counihan [24], Gartshore and De Croos [25], Fang and Sill [26], Varshney and Poddar [27], Refs. [28,29].…”

Section: Wind-tunnel Experimentsmentioning

confidence: 99%

Physical modeling of complex airflows developing above rural terrains

Kozmar

2011

Environ Fluid Mech

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The rural atmospheric boundary layer (ABL) flow was reproduced in a wind tunnel at three different simulation length scales to investigate possible effects of the simulation length scale on flow characteristics. Performance of truncated vortex generators developed for part-depth ABL wind-tunnel simulations was tested in rural terrain exposure against the full-size Counihan vortex generators. A procedure to design the ABL developing above rural type terrain has been described. The 1:395 and 1:236 simulations were created as full-depth simulations, i.e., wind characteristics throughout an entire ABL were reproduced in the wind tunnel. The 1:208 simulation was a part-depth simulation, i.e., only a lower 70% of the ABL was experimentally modelled. The projected scaled-up ABL thicknesses are 395, 354, and 416 m full-scale in the 1:395, 1:236, and 1:208 simulations, respectively. Experimental results show similar trends in all three configurations not depending on the simulation length scale factor. This clearly indicates a possibility to physically, in the wind tunnel, reproduce the same rural atmospheric airflows at different simulation length scales.

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“…By utilizing other required auxiliary devices, the wind tunnel testing is able to simulate and analyze both laminar and turbulent distributions in the boundary layer. [3][4]From the results engineers can optimize the design for dampening the airflow separation and induced drag generation. The experiment discussed in this paper has utilized the same approach to test three novel wing configurations.…”

Section: Introductionmentioning

confidence: 99%