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Speaker: Malcolm Hillebrand Title: Active Turbulence: When biology causes chaos, and using the Power of the GPU (TM) to tackle it Abstract: Turbulence is a familiar problem to many, both in scientific research and in trying to cross a windy bridge. However, in the last two decades, a series of surprising discoveries have uncovered a new kind of turbulence that does not require pumping wind or rapid pipe flow: Active turbulence. First observed in swarming bacteria, this phenomenon describes the chaotic flows seen at extremely small scales (near zero Reynolds number or flow speeds). As more biological and artificial systems are shown to exhibit active turbulence, the interest in theoretical and computational modelling has grown commensurately. Here I will present a minimal model of active turbulence that reproduces flow patterns seen in kinesin-microtubule suspensions (which resemble the surface of a cell), and discuss the transition to turbulence in this model and the computational aspects that go into this -- data analysis and visualisation, and CUDA implementation of an implicit PDE solving scheme for accurate long-time simulations. The physics and maths will be largely fun and informal, with a bit more detail on the computing side. Biography: Malcolm is a lecturer in the Department of Mathematics and Applied Mathematics at UCT. He completed his PhD in computational and theoretical nonlinear dynamics applied to polyatomic systems at UCT in 2020. He went on to do a joint postdoc with the Maths Department and the Scientific Computing Research Unit at UCT in dynamics of chemical reactions, followed by two years at the Max Planck Institute for the Physics of Complex Systems and the Center for Systems Biology Dresden, working on active turbulence and the interface of nonlinear dynamics and biophysics. More research details can be found at his website: hillebrand.co.za
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