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Aerodynamic Flows | |
(1)This animation shows the Direct Lyapunov Exponent (DLE) field for unsteady flow about a GLAS II airfoil in the presence of flow control. The flow control is driven by a periodic jet located on the surface of the airfoil at approximately 60% cord length. The one-dimensional curve of high DLE is referred to as a Lagrangian Coherent Structure (LCS), which is a nearly invariant manifold that represents a finite-time approximation to the separation profile. The velocity field data was provided by Jeff Eldredge at UCLA. |
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GLAS2-ACT.avi (707KB) |
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(2)This animation shows the DLE field for unsteady flow about a GLAS II airfoil in the presence of flow control. The difference from the previous animation above is that the jet is located on the surface of the airfoil at approximately 50% cord length. Again, the velocity field data was provided by Jeff Eldredge at UCLA. |
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GLAS2-ACT2.avi (1.6MB) |
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(3)This animation is identical to the movie (2) above, except the Eulerian velocity field is not shown, but instead, tracers have been placed in the flow to show the Lagrangian behavior of the LCS and show that it indeed does act as a Lagrangian barrier which represents the separation profile that separates the free-stream flow from the "dead-water" zone. For convenience, tracers are colored based on their original location relative to the LCS. |
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GLAS2-DRFTRS-2.avi (1.1MB) |
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