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 - 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.
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.
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
SN - 2469-990X
VL - 3
JO - Physical Review Fluids
JF - Physical Review Fluids
IS - 3
M1 - 033801
ER -