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Title: Reaction analogy based forcing for incompressible scalar turbulence

Abstract

Here, we present a novel reaction analogy (RA) based forcing method for generating statistically stationary scalar fields in incompressible turbulence. The new method can produce more general scalar probability density functions (PDFs), for example, quasi-double- δ PDF, than current methods, while ensuring that scalar fields remain bounded, unlike existent forcing methodologies that can potentially violate naturally existing bounds. Such features are useful for generating initial fields in nonpremixed combustion, inlet conditions for spatially developing flows, or for studying non-Gaussian scalar turbulence. The RA method mathematically models hypothetical chemical reactions that convert reactants in a mixed state back into its pure unmixed components. Various types of chemical reactions are formulated and the corresponding mathematical expressions derived such that the reaction term is smooth in scalar space and is consistent with mass conservation. For large values of the scalar forcing rate, the method produces statistically stationary quasi-double- δ scalar PDFs. Quasiuniform, Gaussian, and stretched exponential scalar statistics are recovered for smaller values of the scalar forcing rate. The shape of the scalar PDF can be further controlled by changing the stoichiometric coefficients of the reaction. Finally, the ability of the new method to produce fully developed passive scalar fields with quasi-Gaussian PDFs is also investigated, by exploring the convergence of the scalar variance spectrum to the Obukhov-Corrsin scaling and of the third-order mixed structure function to the “four-thirds” Yaglom's law.

Authors:
 [1];  [1];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Chung-Ang Univ., Seoul (Korea, Republic of). School of Mechanical Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1477698
Alternate Identifier(s):
OSTI ID: 1468870
Report Number(s):
LA-UR-18-22664
Journal ID: ISSN 2469-990X
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Fluids
Additional Journal Information:
Journal Volume: 3; Journal Issue: 9; Journal ID: ISSN 2469-990X
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; mixing; turbulence

Citation Formats

Daniel, Don, Livescu, Daniel, and Ryu, Jaiyoung. Reaction analogy based forcing for incompressible scalar turbulence. United States: N. p., 2018. Web. doi:10.1103/PhysRevFluids.3.094602.
Daniel, Don, Livescu, Daniel, & Ryu, Jaiyoung. Reaction analogy based forcing for incompressible scalar turbulence. United States. doi:10.1103/PhysRevFluids.3.094602.
Daniel, Don, Livescu, Daniel, and Ryu, Jaiyoung. Thu . "Reaction analogy based forcing for incompressible scalar turbulence". United States. doi:10.1103/PhysRevFluids.3.094602. https://www.osti.gov/servlets/purl/1477698.
@article{osti_1477698,
title = {Reaction analogy based forcing for incompressible scalar turbulence},
author = {Daniel, Don and Livescu, Daniel and Ryu, Jaiyoung},
abstractNote = {Here, we present a novel reaction analogy (RA) based forcing method for generating statistically stationary scalar fields in incompressible turbulence. The new method can produce more general scalar probability density functions (PDFs), for example, quasi-double-δ PDF, than current methods, while ensuring that scalar fields remain bounded, unlike existent forcing methodologies that can potentially violate naturally existing bounds. Such features are useful for generating initial fields in nonpremixed combustion, inlet conditions for spatially developing flows, or for studying non-Gaussian scalar turbulence. The RA method mathematically models hypothetical chemical reactions that convert reactants in a mixed state back into its pure unmixed components. Various types of chemical reactions are formulated and the corresponding mathematical expressions derived such that the reaction term is smooth in scalar space and is consistent with mass conservation. For large values of the scalar forcing rate, the method produces statistically stationary quasi-double-δ scalar PDFs. Quasiuniform, Gaussian, and stretched exponential scalar statistics are recovered for smaller values of the scalar forcing rate. The shape of the scalar PDF can be further controlled by changing the stoichiometric coefficients of the reaction. Finally, the ability of the new method to produce fully developed passive scalar fields with quasi-Gaussian PDFs is also investigated, by exploring the convergence of the scalar variance spectrum to the Obukhov-Corrsin scaling and of the third-order mixed structure function to the “four-thirds” Yaglom's law.},
doi = {10.1103/PhysRevFluids.3.094602},
journal = {Physical Review Fluids},
number = 9,
volume = 3,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Snapshots of the scalar field, $ϕ$, produced by the proposed RA (with different target scalar dissipation rates), LS, and IMG forcing methods. The underlying turbulent field is the same for all four cases.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.