Abstract
The flow over two three-dimensional bluff bodies in tandem arrangement is widely encountered in both natural environments and engineering applications. Here we perform a detailed numerical investigation on the wake bifurcations behind two axisymmetric bluff bodies in tandem. Our study explores the overall range of Re between 100 - 500 and the separation distance $S/d$=1, 2, 4, and 6. Seven main wake regimes are identified, and detailed wake bifurcation scenarios depending on Re and the separation distance are provided.
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