Accession Number : ADA265452


Title :   Effect of Rotation Rate on the Forces of a Rotating Cylinder: Simulation and Control


Descriptive Note : Contractor rept.,


Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA


Personal Author(s) : Burns, John A ; Ou, Yuh-Roung


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265452.pdf


Report Date : Mar 1993


Pagination or Media Count : 49


Abstract : This paper presents numerical solutions to several optimal control problems for an unsteady viscous flow. The main thrust of this work is devoted to simulation and control of an unsteady flow generated by a circular cylinder undergoing rotary motion. By treating the rotation rate as a control variable we formulate two optimal control problems and use a central difference/ pseudospectral transform method to numerically compute the optimal control rates. Several types of rotations are considered as potential controls and we show that a proper synchronization of forcing frequency with the natural vortex shedding frequency can greatly influence the flow. The results here indicate that using moving boundary controls for such systems may provide a feasible mechanism for flow control


Descriptors :   *FLUID CONTROL , *MATHEMATICAL MODELS , *UNSTEADY FLOW , *VISCOUS FLOW , COMPUTATIONS , NUMERICAL ANALYSIS , OPTIMIZATION , PROBLEM SOLVING , ROTATION


Subject Categories : Numerical Mathematics
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE