An experimental and numerical study on the flow over two-dimensional hills

Kim, Hyun Goo; Lee, Choung Mook; Lim, Hee-Chang; Kyong, Nam-Ho

doi:10.1016/s0167-6105(97)00007-x

Cited by 94 publications

(56 citation statements)

References 22 publications

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“…Clearly, the point with the maximum is located at a higher height for double hill case (especially for S5H4 hill case). This suggests that the inner layer expands upwards over double hill, leading to a higher position of the maximum (= ) [4,8]. One may also see the upwind S5H7 hill takes much more effect on the flow over the downwind S5H4 hill, agreeable with those in Figures 4-6.…”

Section: (G) (H)supporting

confidence: 84%

“…Clearly, compared with experimental results, the general trend of k with was almost reproduced by computation. From these results, the developed CFD algorithm was verified and it would be deployed in the following sections, since the turbulent flow of the cyclone is of similar order of Re (based on hill height, around 10 5 ) as those in Kim et al [4]. By doing so, it might cause some unnecessary errors during the analysis of the flow field in a very specific way.…”

Section: Development Of Computational Fluid Dynamics (Cfd) Methodsmentioning

confidence: 81%

“…To verify the developed CFD method, we used the same situation, e.g., incoming flow condition and test models, as the experiment by Kim et al [4]. Interested readers may consult reference for the details of the experiments.…”

Section: Development Of Computational Fluid Dynamics (Cfd) Methodsmentioning

confidence: 99%

“…For the former, experiments were often carried out in wind tunnels to measure the distributions of mean and fluctuating magnitudes, e.g., mean velocity, fractional speed-up ratio, turbulence intensity, turbulent kinetic energy and Reynolds stress, using Particle Image Velocimetry (PIV), hot wires or Pitot tubes, etc. In this way, one may study how the complex terrains affect the local atmospheric boundary layer [3][4][5][6][7][8][9][10]. In respect of numerical work, most research efforts have been made on turbulence modeling, surface roughness, boundary condition and grid generation to guarantee the accuracy and efficiency of the computational fluid dynamics (CFD) computation on terrain effect [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Considering its complicated situation, the experimental work will be carried out in the near future. To this end, we first developed a CFD method and then verified it by comparing the numerical results with the experimental ones by Kim et al [4]. After that, the developed CFD arithmetic was utilized to assess the flow field over double hills under typical beneficial and destructive cyclone conditions, based on the analysis of the field test data around the Chinese southeast coastal area.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Wind Resource Assessment over 2D Continuous Rolling Hills Due to Tropical Cyclones in the Coastal Region of Southeastern China

Zhang

Liu

2014

Energies

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Abstract:The effect of tropical cyclones on the turbulent flow over 2D continuous rolling hills was numerically investigated based on a field test analysis of the coastal region of Southeast China. A computational fluid dynamics (CFD) method was first developed and verified using previously published experimental results. Then two typical beneficial and destructive cyclone cases were studied above different locations of the hills. Results showed that the continuous hilly flow was much more drastic and variable than previously reported normal wind; the mean and turbulent magnitudes became the strongest around the hill top, with the maximum speed-up ratio, turbulence intensity and gust-speed ratio of 1.1, 0.32 and 1.6; the flow over lower hill was greatly affected by the nearby higher hills; the mean and fluctuating quantities were mostly smaller than the corresponding single hill case. These phenomena were considered to be related with the rather strong detachment and attachment of the cyclone flow around the two hills. In addition, the mean and fluctuating wind velocities were found to be underestimated by at least 20% if the widely accepted IEC standard equations were utilized, suggesting the necessity to supplement the field test analysis in the standard for more reasonable wind resource evaluation within the Southeast China coastal area.

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Section: (G) (H)supporting

confidence: 84%

Section: Development Of Computational Fluid Dynamics (Cfd) Methodsmentioning

confidence: 81%

Section: Development Of Computational Fluid Dynamics (Cfd) Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Wind Resource Assessment over 2D Continuous Rolling Hills Due to Tropical Cyclones in the Coastal Region of Southeastern China

Zhang

Liu

2014

Energies

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Numerical Simulation of Pollution Dispersion over Real Terrain

Beneš

Bodnár

Fraunié

et al. 2003

Proc Appl Math and Mech

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The paper presents a mathematical and numerical investigation of the atmospheric boundary layer (ABL) flow over coal depot. Two mathematical models have been mentioned based upon: 1) the RANS equations in the conservative form and 2) the Boussinesq approximation of RANS equations in the non–conservative form, both formulated for an incompressible flow with a simple algebraic turbulence closure and given stationary boundary conditions. Also pollution dispersion of passive pollutants has been considered.

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A wind‐tunnel study of the wake development behind wind turbines over sinusoidal hills

2018

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In the present work, the wake development behind small‐scale wind turbines is studied when introducing local topography variations consisting of a series of sinusoidal hills. Additionally, wind‐tunnel tests with homogeneous and sheared turbulent inflows were performed to understand how shear and ambient turbulence influence the results. The scale of the wind‐turbine models was about 1000 times smaller than full‐size turbines, suggesting that the present results should only be qualitatively extrapolated to real‐field scenarios. Wind‐tunnel measurements were made by means of stereoscopic particle image velocimetry to characterize the flow velocity in planes perpendicular to the flow direction. Over flat terrain, the wind‐turbine wake was seen to slowly approach the ground while it propagated downstream. When introducing hilly terrain, the downward wake deflection was enhanced in response to flow variations induced by the hills, and the turbulent kinetic energy content in the wake increased because of the speed‐up seen over the hills. The combined wake observed behind 2 streamwise aligned turbines was more diffused and when introducing hills, it was more prone to deflect towards the ground compared to the wake behind an isolated turbine. Since wake interactions are common at sites with multiple turbines, this suggested that it is important to consider the local hill‐induced velocity variations when onshore wind farms are analysed. Differences in the flow fields were seen when introducing either homogeneous or sheared turbulent inflow conditions, emphasizing the importance of accounting for the prevailing turbulence conditions at a given wind‐farm site to accurately capture the downstream wake development.

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An experimental and numerical study on the flow over two-dimensional hills

Cited by 94 publications

References 22 publications

Investigation of the Wind Resource Assessment over 2D Continuous Rolling Hills Due to Tropical Cyclones in the Coastal Region of Southeastern China

Investigation of the Wind Resource Assessment over 2D Continuous Rolling Hills Due to Tropical Cyclones in the Coastal Region of Southeastern China

Numerical Simulation of Pollution Dispersion over Real Terrain

A wind‐tunnel study of the wake development behind wind turbines over sinusoidal hills

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