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SR13 Mecânica dos Fluidos |
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Title:
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TRANSITION FROM ORDER TO CHAOS IN THE WAKE OF A RECTANGULAR CYLINDER
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Summary :
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ALTHOUGH THE TRANSITION FROM ORDER TO CHAOS IN NONLINEAR SYSTEMS HAS BEEN VERIFIED AND DETAILED FOR A NUMBER OF EXPERIMENTS ON CLOSED FLOW, THE LITERATURE ON THIS SUBJECT IS SCARCE OR NON-EXISTENT FOR EXTERNAL FLOWS. IN THIS WORK, WE HAVE STUDIED THE TRANSITION TO CHAOS IN THE ONSET OF THE WAKE OF THE FLOW PAST A RECTANGULAR CYLINDER, A TYPICAL EXTERNAL FLOW. THE EXPERIMENTAL DATA HAVE BEEN OBTAINED WITH A HOT-FILM ANEMOMETER IN A HYDRODYNAMICAL TUNNEL. WE FOUND THAT BY INCREASING THE REYNOLDS NUMBER, THE CORRESPONDING PERIODIC FLOW HAS BECOME UNSTABLE BY AN INTERMITTENCE SCENARIO, A PERIOD-DOUBLING CASCADE, OR A HOPF BIFURCATION. THE DEGREE OF CHAOTIC BEHAVIOR HAS BEEN VERIFIED BY APPLYING CONCEPTS FROM NONLINEAR DYNAMICS TO THE EXPERIMENTAL DATA, THEREFORE RELATING THE UNDERLYING PHYSICS OF THE SYSTEM TO THE ELEMENTS OF MODE INTERACTION AND CHAOS. |
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Author :
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Cambraia, Heraldo Nélio
Dias-Jr, Tito 0
Lindquist, Cláudio 0
Woiski, Emanuel Rocha
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Paper View :
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