Evaluating the control of a cylinder wake by the method of sensitivity analysis

Numerical simulations and sensitivity analysis are carried out regarding control vortex shedding from a circular cylinder using small rotating and non-rotating control cylinders. Prediction of the changes in unsteady wake, instability growth rate, and frequency produced by the control devices is pre...

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Bibliographic Details
Published in:Physics of fluids (1994) 2017-04, Vol.29 (4)
Main Authors: Patino, G. A., Gioria, R. S., Meneghini, J. R.
Format: Article
Language:English
Subjects:
Base flow
Circular cylinders
Computational fluid dynamics
Computer simulation
Control stability
Direct numerical simulation
Flow control
Fluid dynamics
Physics
Rotating cylinders
Rotation
Sensitivity analysis
Vortex shedding
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Summary:Numerical simulations and sensitivity analysis are carried out regarding control vortex shedding from a circular cylinder using small rotating and non-rotating control cylinders. Prediction of the changes in unsteady wake, instability growth rate, and frequency produced by the control devices is presented in the framework of sensitivity analysis to steady field force. In the case of the rotating cylinders, this prediction relies on the observation that the small control cylinders introduce a steady force whose direction is not aligned to the base flow direction. This external force direction depends on the control cylinders rotation rates having an additional parameter to attain flow control. The evaluation of the control cylinders rotation rate within the sensitivity analysis framework is a novel contribution in this work. The results of the sensitivity analysis to a steady force are then compared to direct numerical simulation computations of the flow fields serving as supporting data for discussion.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4979482