Aneesur Rahman Prize for Computational Physics Talk: Fluids and Deforming Surfaces

Interesting feedback effects occur, when fluids deform their own boundary conditions. The first example I will show is laminar flow through a porous medium. Here large scale LBM simulation show that wall erosion and sediment deposition can produce power-law distributed bursts in flux and pressure. I will also elucidate the similarities to “campylotic” media, i.e. randomly curved spaces. The second example concerns dune formation in turbulent winds. The numerical solution of equations of motions for the granular surface allows reproducing shapes and velocities of dunes. Insight about the Aeolian transport of grains due to saltation and about the resulting electric charges can be obtained through a coupled fluid –particle simulation. The third example is electronic flow on deforming graphene sheets, which can be calculated using relativistic LBM on curved surfaces obtained from large scale MD simulations at fixed temperature.