Skin Friction Reduction Characteristics of Nonsmooth Surfaces Inspired by the Shapes of Barchan Dunes

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Level</td><td class="align_center">Depth (mm)</td><td class="align_center">Angle of repose (°)</td><td class="align_center">Spacing (mm)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">1</td><td class="align_center">4</td><td class="align_center">31</td><td class="align_center">25</td></tr><tr><td class="align_left">2</td><td class="align_center">7</td><td class="align_center">33</td><td class="align_center">30</td></tr><tr><td class="align_left">3</td><td class="align_center">10</td><td class="align_center">35</td><td class="align_center">35</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Mathematical Problems in Engineering

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Table 3

Table 3: Skin Friction Reduction Characteristics of Nonsmooth Surfaces Inspired by the Shapes of Barchan Dunes 