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Self-contained filtered density function

Journal Article · · Physical Review Fluids
 [1];  [1];  [1];  [2];  [3]
  1. Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
  3. Cornell Univ., Ithaca, NY (United States). Sibley School of Mechanical and Aerospace Engineering

The filtered density function (FDF) closure is extended to a “self-contained” format to include the subgrid-scale (SGS) statistics of all of the hydro-thermo-chemical variables in turbulent flows. These are the thermodynamic pressure, the specific internal energy, the velocity vector, and the composition field. In this format, the model is comprehensive and facilitates large-eddy simulation (LES) of flows at both low and high compressibility levels. A transport equation is developed for the joint pressure-energy-velocity-composition filtered mass density function (PEVC-FMDF). In this equation, the effect of convection appears in closed form. The coupling of the hydrodynamics and thermochemistry is modeled via a set of stochastic differential equation for each of the transport variables. This yields a self-contained SGS closure. We demonstrated how LES is conducted of a turbulent shear flow with transport of a passive scalar. Finally, the consistency of the PEVC-FMDF formulation is established, and its overall predictive capability is appraised via comparison with direct numerical simulation (DNS) data.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Air Force Research Laboratory (AFRL); National Science Foundation (NSF)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1407883
Report Number(s):
LA-UR-17-22145
Journal Information:
Physical Review Fluids, Journal Name: Physical Review Fluids Journal Issue: 9 Vol. 2; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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