D'Alembert's paradox
= D'Alembert's paradox
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Ideal <steady flow> with <incompressible flow>, <inviscid flow> and <irrotational flow> can predict zero <drag> on a body that has nonzero <drag> in a real <fluid>. The zero-<circulation> cylinder <pressure coefficient> distribution gives an explicit cancellation example; <viscosity> and <flow separation> are absent from that model.