Abstract
We consider Newton's problem of minimal resistance for unbounded bodies in Euclidean space ℝd, d ≥ 2. A homogeneous flow of noninteracting particles of velocity v falls onto an immovable body containing a half-space {x : (x, n) < 0} ⊂ ℝd, (v, n) < 0. No restriction is imposed on the number of (elastic) collisions of the particles with the body. For any Borel set A ⊂ {v} ⊥ of finite measure, consider the flow of cross-section A: the part of initial flow that consists of particles passing through A.
We construct a sequence of bodies that minimize resistance to the flow of cross-section A, for arbitrary A. This sequence approximates the half-space; any particle collides with any body of the sequence at most twice. The infimum of resistance is always one half of corresponding resistance of the half-space.
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References
M. Comte and T. Lachand-Robert, Functions and domains having minimal resistance under a single-impact assumption. SIAM J. Math. Anal. 34(2002), No. 1, 101–120.
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Plakhov, A. Newton's Problem of Minimal Resistance for Bodies Containing a Half-Space. Journal of Dynamical and Control Systems 10, 247–251 (2004). https://doi.org/10.1023/B:JODS.0000024124.04032.ef
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DOI: https://doi.org/10.1023/B:JODS.0000024124.04032.ef