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Dr. Bernat Font Garcia – Applied Mathematics Colloquium
March 26, 2021 @ 4:00 pm - 5:00 pm
Speaker: Dr. Bernat Font Garcia
Position: Postdoctoral researcher at the Barcelona Supercomputing Center (BSC-CNS), formerly at University of Southampton (UK)
Title: A ML model to simulate 3D turbulence in a 2D system applied to long cylindrical structures
Abstract: Turbulence is a non-linear phenomenon in fluids involving a wide range of complex temporal and spatial structures. This often makes the resolution requirements of numerical simulations very high, yielding costly and time-consuming computations. Turbulence models are used to skip resolving a certain range of scales, but this can still be insufficient for canonical engineering problems such as flow past long cylindrical structures. In this talk, we will first review the turbulence dimensionality of wake flows as the span of the cylinder varies so that we can build a physical understanding of the problem. Then, a ML model will be presented to close a novel formulation of the fluid governing equations that allows to reduce the system dimensionality of turbulent homogeneous flows from 3D to 2D Results of this framework will be presented for a-priori (offline) and a-posteriori (online) deployments of the ML model, which has the potential of speeding-up the simulation of turbulent homogeneous flows by orders of magnitude.