The drag of axisymmetric bodies can be reduced by boundary-layer suction, which delays transition and can control separation. In this study, boundary-layer transition is delayed by applying a distributed suction technique. Optimization calculations were performed to define the minimal drag bodies at Reynolds numbers of 107 and 108. The saving in drag relative to optimal bodies with non-controlled boundary layers is shown to be 18 and 78 percent, at Reynolds numbers of 107 and 108, respectively.
Boundary-Layer Control as a Means of Reducing Drag on Fully Submerged Bodies of Revolution
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Bar-Haim, B., and Weihs, D. (September 1, 1985). "Boundary-Layer Control as a Means of Reducing Drag on Fully Submerged Bodies of Revolution." ASME. J. Fluids Eng. September 1985; 107(3): 342–347. https://doi.org/10.1115/1.3242489
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