CaltechAUTHORS
  A Caltech Library Service

Derivation of a realistic forcing term to reproduce the turbulent characteristics of round jets on the centerline

Rah, Kyupaeck Jeff and Dhandapani, Chandru and Blanquart, Guillaume (2018) Derivation of a realistic forcing term to reproduce the turbulent characteristics of round jets on the centerline. Physical Review Fluids, 3 (8). Art. No. 084606. ISSN 2469-990X. http://resolver.caltech.edu/CaltechAUTHORS:20180829-095555389

[img] PDF - Published Version
See Usage Policy.

846Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20180829-095555389

Abstract

Turbulence forcing techniques are often required in the numerical simulation of statistically stationary turbulent flows. However, the existing forcing techniques are not based on physics, but rather arbitrary numerical methods that sustain the turbulent kinetic energy. In this work, a forcing technique is devised to reproduce the centerline turbulent characteristics of round jets in a triply periodic box. It is derived from the Navier-Stokes equations by applying a Reynolds decomposition with the mean velocity of the axisymmetric jet. The result is an anisotropic linear forcing term, which is intended to be used in a three-dimensional box to create turbulence. Four direct numerical simulations with different Re_λ have been performed with these forcing terms. The budget of the terms in the kinetic energy equation is very close to the experimental measurement on the centerline. The anisotropy, kinetic energy k, and dissipation rate ɛ of the simulations are also comparable to experimental values. Finally, the kinetic energy spectrum in the axial direction, ϕ(κ_1), is presented. With appropriate normalizations, the spectrum agrees well with the round jet spectrum on its centerline.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physrevfluids.3.084606DOIArticle
ORCID:
AuthorORCID
Rah, Kyupaeck Jeff0000-0003-1898-2930
Blanquart, Guillaume0000-0002-5074-9728
Additional Information:© 2018 American Physical Society. (Received 14 December 2017; published 29 August 2018) The authors gratefully acknowledge funding from the National Science Foundation (CBET 1512771) and from the Air Force Office of Scientific Research (FA9550-16-1-0510) under the supervision of Dr. Chiping Li. In addition, K.J.R. acknowledges the financial support from the Samsung Scholarship Foundation.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSFCBET-1512771
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0510
Samsung ScholarshipUNSPECIFIED
Record Number:CaltechAUTHORS:20180829-095555389
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180829-095555389
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89270
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 Aug 2018 17:48
Last Modified:29 Aug 2018 17:49

Repository Staff Only: item control page