The dynamics of the flow past a cylinder is drastically affected when external periodic disturbances are present in the flow. For a certain range of amplitude and frequency of disturbances the flow bifurcates to a chaotic state, even at low Reynolds numbers. In this Letter, the effect of these chaotic responses on transport measures (e.g., the heat transfer coefficient) by direct numerical simulations using spectral element methods is investigated. It is found that transport quantities oscillate aperiodically in time; their time‐averaged value increases slightly from the undisturbed state. However, their amplitude increases dramatically from that of the undisturbed flow or any other excited, resonant, or quasiperiodic neighboring state.

Topics
Thermodynamic states and processes, Numerical methods
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© 1989 American Institute of Physics.
1989
American Institute of Physics
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