Finding the Optimal Distance and Cross Section for the Control Body to Decrease the Effects of Vibrations Caused by Vortexes in the Lock-in Area

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Abstract

The goal of the current research is to study the phenomenon of vortex vibrations and find a way to decrease its effects using the control body. So, first we simulated a cylinder on an elastic foundation subjected to a uniform fluid flow. After comparing the results against (the results of) other similar experimental and numerical studies, and making sure of their validity and accuracy, the cylindrical-cross-section control body is put behind the main cylinder in 5 different distances, and its optimal distance is determined while its effect on lift and drag mean coefficients, and the maximum oscillation amplitude in the lock-in area are studied. Then, the effects of changing the pattern of placement and the cross section of the control body are studied to discover the optimal cross section. First the effect of placing two control cylinders both perpendicular and parallel to the flow in the optimal distance found earlier are studied. At the end, the effects of using control bodies with different non-circular cross sections whose hydraulic diameter are equal to the main cylinder are studied.

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Journal of Solid and Fluid Mechanics
Volume 3, Issue 1 - Serial Number 1
March and April 2013
Pages 81-94

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