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Explore the mathematical foundations of fluid boundary layers in this comprehensive lecture that examines both classical methods and recent developments in the field. Delve into the Prandtl boundary layer model, which describes incompressible fluid behavior with small viscosity near solid walls, beginning with the well-established results from Oleinik's 1960s work on 2D equations in stationary cases without reversed flow. Investigate the critical challenges that arise near separation points and in recirculating zones, where singularities generically appear and potentially invalidate the model. Examine open questions regarding alternative models for regions near separation points and modifications needed in recirculation zones to avoid singularities. Analyze the time-dependent case where the system maintains well-posedness in Sobolev spaces under monotone tangential velocity conditions, while understanding how instabilities develop near non-monotone shear flows that prevent well-posedness. Discover related results on variants of the Prandtl system, including interactive boundary layer systems and triple deck systems, providing a comprehensive foundation for understanding fluid dynamics in boundary layer contexts.
