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Non-Markovian closure models for large eddy simulations using the Mori-Zwanzig formalism

Eric J. Parish* and Karthik Duraisamy†

  • Department of Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA

  • *Corresponding author: parish@umich.edu
  • †Corresponding author: kdur@umich.edu
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Phys. Rev. Fluids 2, 014604 – Published 23 January, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.014604

Abstract

This work uses the Mori-Zwanzig (M-Z) formalism, a concept originating from nonequilibrium statistical mechanics, as a basis for the development of coarse-grained models of turbulence. The mechanics of the generalized Langevin equation (GLE) are considered, and insight gained from the orthogonal dynamics equation is used as a starting point for model development. A class of subgrid models is considered which represent nonlocal behavior via a finite memory approximation [Stinis, arXiv:1211.4285 (2012)], the length of which is determined using a heuristic that is related to the spectral radius of the Jacobian of the resolved variables. The resulting models are intimately tied to the underlying numerical resolution and are capable of approximating non-Markovian effects. Numerical experiments on the Burgers equation demonstrate that the M-Z-based models can accurately predict the temporal evolution of the total kinetic energy and the total dissipation rate at varying mesh resolutions. The trajectory of each resolved mode in phase space is accurately predicted for cases where the coarse graining is moderate. Large eddy simulations (LESs) of homogeneous isotropic turbulence and the Taylor-Green Vortex show that the M-Z-based models are able to provide excellent predictions, accurately capturing the subgrid contribution to energy transfer. Last, LESs of fully developed channel flow demonstrate the applicability of M-Z-based models to nondecaying problems. It is notable that the form of the closure is not imposed by the modeler, but is rather derived from the mathematics of the coarse graining, highlighting the potential of M-Z-based techniques to define LES closures.

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Phys. Rev. Fluids 2, 014604– Published 23 January, 2017
  • Received 8 September 2016
Article part of CHORUS

©2017 American Physical Society

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