Sub-Grid Model Development for Large-Eddy Simulations Using Artificial Neural Networks

Event Sponsor: 
Mathmatics and Computer Science Division Seminar
Start Date: 
Aug 28 2018 - 2:00pm
Building/Room: 
Building 240/Room 4301
Location: 
Argonne National Laboratory
Speaker(s): 
Romit Maulik
Speaker(s) Title: 
Oklahoma State University
Host: 
Prasanna Balaprakash

In this seminar, we detail results from multiple studies which have utilized data-driven ideologies for tackling the challenging problem of closure in the large eddy simulations (LES) of nonlinear partial differential equations. One motivation for this research is the long-term objective of precluding phenomenological arguments which limit closure generalizability across different flow classes. Our novel data-driven closures are implemented through various artificial neural network formulations trained through data-harvesting from direct numerical simulations. Our analyses are both a-priori and a-posteriori, with the latter representing one of the first implementations of a purely data-driven turbulence closure within the LES paradigm. The performance of our proposed framework is highly promising, with networks showing the ability to learn sub-grid models which compare favorably to a-priori model-form and model-coefficient based eddy-viscosity closures for decaying two and th ree-dimensional turbulence.

Miscellaneous Information: 

This seminar will be streamed, see details at https://anlpress.cels.anl.gov/mcs-streaming-seminars

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