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This lecture explores the fascinating physics of bacterial movement in porous media, presented by Dr. Harold Auradou, Head of the FAST laboratory at Université Paris-Saclay and CNRS researcher. Discover how bacteria use their flagella to navigate fluid environments and why physicists classify them as active particles. The 44-minute presentation examines experimental, numerical, and theoretical findings about bacterial swimming behavior in flows and their dispersion patterns within porous structures. Learn about the newly identified "active filtration regime" that increases bacterial retention in porous materials. The lecture also covers how hydrodynamic interactions between bacteria at high densities create collective behaviors that reduce fluid viscosity, affecting how dense bacterial suspensions disperse through porous media. The discussion concludes by considering the potential influences of aerotaxis and chemotaxis on bacterial movement through porous environments.
