JFM Webinar Series

Solution discovery in fluid dynamics using neural networks Prof Ching-Yao Lai Stanford University Friday, December 1, 2023 4:00 PM (Europe/London)

Speaker: Guohua Wang, Lanzhou University, China Date/Time: Friday 18th June 2021 4:00pm BST/11am EDT Title: Very-large scale motions in the atmospheric surface layer Abstract: Very-large scale motions (VLSMs) are typical structures in wall-bounded turbulence at high Reynolds number, which make important contributions to mass and energy transport. This talk will present the atmospheric surface layer observations carried out at...

Speaker: Jane Bae, Harvard University, USA Date/Time: Friday 11th June 2021 4:00pm BST/11am EDT Title: Nonlinear interaction of the self-sustaining process in the near-wall region of wall-bounded turbulence Abstract: We investigate the nonlinear interaction in the self-sustaining process of wall-bounded turbulence. Resolvent analysis is used to identify the principal forcing (nonlinear) mode which produces the maximum amplification in direct...

  Speaker: Laura Cope, Cambridge University, UK Date/Time: Friday 4th June 2021 4:00pm BST/11am EDT Title: The dynamics of stratified horizontal shear flows at low Péclet number Abstract: Stratified flows are ubiquitous; examples include atmospheres and oceans in geophysics and stellar interiors in astrophysics. The interaction of a stable stratification with a background velocity distribution can develop into stratified...

Speaker: Chris Howland, University of Twente, Netherlands Date/Time: Friday 28th May 2021 4:00pm BST/11am EST Title: Quantifying mixing in simulations of stratified flows Abstract: Turbulent mixing exerts a significant influence on many physical processes in the ocean. In a stably stratified Boussinesq fluid, this irreversible mixing describes the conversion of available potential energy (APE) to background potential energy (BPE)....

Speaker: Adrian Lozano-Duran, MIT, USA Date/Time: Friday 21st May 2021 4:00pm BST/11am EST Title: Cause-and-effect of linear mechanisms sustaining in wall turbulence Abstract: Despite the nonlinear nature of turbulence, there is evidence that part of the energy-transfer mechanisms sustaining wall turbulence can be ascribed to linear processes. The different scenarios stem from linear stability theory and comprise exponential instabilities,...

Speaker: George Fortune, University of Cambridge, UK Date/Time: Friday 14th May 2021 4:00pm BST/11am EST Title: Waltzing worms: the dynamics of plant-animal collective vortex structures Abstract: Circular milling, a stunning manifestation of collective motion, is found across the natural world, from fish shoals to army ants. It has been observed recently that the plant-animal worm Symsagittifera roscoffensis exhibits circular milling behaviour,...

Speaker: Zijing Ding, Harbin Institute of Technology, China Date/Time: Friday 7th May 2021 4:00pm BST/11am EST Title: Coating Liquid Films down a Vertical Fibre Abstract: Previous experimental study by Kliakhandler et al. (JFM 429:381-390, 2001) reported three different flow patterns of a liquid film flowing down a vertical cylinder. The film flow is unstable due to the famous Plateau-Rayleigh...

Speaker: Jesse Capecelatro, University of Michigan, USA Date/Time: Friday 30th April 2021 4:00pm BST/11am EST Title: Turbulence modeling of strongly-coupled gas-particle flows Abstract: Many natural and industrial processes involve the flow of solid particles or liquid droplets whose dynamical evolution are intimately coupled with a carrier gas. A peculiar behavior of such flows is their ability to give...