TY - JOUR
T1 - Wakes behind surface-mounted obstacles
T2 - Impact of aspect ratio, incident angle, and surface roughness
AU - Tobin, Nicolas
AU - Chamorro, Leonardo P.
N1 - Funding Information:
This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1144245. This work was supported by the Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, as part of the start-up package of Leonardo P. Chamorro. The authors would like to acknowledge the contributions of Huiwen Liu and Zhuo Chen to the collection of experimental data.
Funding Information:
This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1144245. This work was supported by the Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, as part of the start-up package of Leonardo P. Chamorro.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/3
Y1 - 2018/3
N2 - The so-called wake-moment coefficient Ch and lateral wake deflection of three-dimensional windbreaks are explored in the near and far wake. Wind-tunnel experiments were performed to study the functional dependence of Ch with windbreak aspect ratio, incidence angle, and the ratio of the windbreak height and surface roughness (h/z0). Supported with the data, we also propose basic models for the wake deflection of the windbreak in the near and far fields. The near-wake model is based on momentum conservation considering the drag on the windbreak, whereas the far-wake counterpart is based on existing models for wakes behind surface-mounted obstacles. Results show that Ch does not change with windbreak aspect ratios of 10 or greater; however, it may be lower for an aspect ratio of 5. Ch is found to change roughly with the cosine of the incidence angle, and to depend strongly on h/z0. The data broadly support the proposed wake-deflection models, though better predictions could be made with improved knowledge of the windbreak drag coefficient.
AB - The so-called wake-moment coefficient Ch and lateral wake deflection of three-dimensional windbreaks are explored in the near and far wake. Wind-tunnel experiments were performed to study the functional dependence of Ch with windbreak aspect ratio, incidence angle, and the ratio of the windbreak height and surface roughness (h/z0). Supported with the data, we also propose basic models for the wake deflection of the windbreak in the near and far fields. The near-wake model is based on momentum conservation considering the drag on the windbreak, whereas the far-wake counterpart is based on existing models for wakes behind surface-mounted obstacles. Results show that Ch does not change with windbreak aspect ratios of 10 or greater; however, it may be lower for an aspect ratio of 5. Ch is found to change roughly with the cosine of the incidence angle, and to depend strongly on h/z0. The data broadly support the proposed wake-deflection models, though better predictions could be made with improved knowledge of the windbreak drag coefficient.
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U2 - 10.1103/PhysRevFluids.3.033801
DO - 10.1103/PhysRevFluids.3.033801
M3 - Article
AN - SCOPUS:85044924656
VL - 3
JO - Physical Review Fluids
JF - Physical Review Fluids
SN - 2469-990X
IS - 3
M1 - 033801
ER -