Instability and Transition of Fluid Flows
Instability and Transition of Fluid Flows. Instructor: Prof. Tapan K. Sengupta, Department of Aerospace Engineering, IIT Kanpur. This course looks at fluid flow transition - the instabilities that lead the flow to turbulent state. Topics covered in the lectures include: introduction to instability and transition - dynamic stability of still atmosphere, Kelvin-Helmholtz instability; instability and transition in flows - inviscid instability theorems, viscous instability of parallel flows, properties of the Orr-Sommerfeld equation and boundary conditions, instability analysis from the solution of the Orr-Sommerfeld equation, receptivity Analysis of the shear layer, direct simulation of receptivity to free stream excitation; bypass transition; spatio-temporal instability and transition; nonlinear stability - Landau equation and multiple Hopf bifurcation and proper orthogonal decomposition of flow past a cylinder; turbulences - dynamics of turbulence, kinetic energy of fluctuations, Kolmogorov's scaling theory and turbulent length scales. (from nptel.ac.in)
Lecture 19 - Direct Simulation of Receptivity to Free Stream Excitation |
Time | Lecture Chapters |
[00:26:00] | 1. Coupling between the Wall and Free Stream Modes |
[00:44:56] | 2. Receptivity to a Train of Convected Vortices in the Free Stream |
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