Direct Numerical Simulation of Turbulent Flow Inside a Differentially Heated Composite Cavity

Javier Martínez, Elia Merzari, Michael Acton, Emilio Baglietto

Research output: Contribution to journalArticle

Abstract

Turbulent flow inside a modified differentially heated cavity at high Rayleigh number (Ra ~ 10 9 ) has been studied through fully resolved direct numerical simulation (DNS) using the high-order spectral element method code Nek5000. The flow configuration includes two separate physical phenomena: the natural recirculation itself, and the flow inside a curved channel. Simulations have been carried out using both the Boussinesq approximation and the low-Mach compressible formulation. Significant discrepancies between the two methods inform of the extreme caution that should be exercised when using the Boussinesq approximation in the limits of its applicability. The DNS solutions are analyzed in terms of polynomial-order convergence and Reynolds stress budgets, and the turbulence quantities and velocity profiles are presented as a reference for the validation of turbulence models.

Original languageEnglish (US)
JournalNuclear Technology
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

Boussinesq approximation
Direct numerical simulation
direct numerical simulation
turbulent flow
Turbulent flow
cavities
composite materials
Reynolds stress
turbulence models
Composite materials
Rayleigh number
Turbulence models
budgets
Mach number
polynomials
Turbulence
velocity distribution
turbulence
Polynomials
formulations

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

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abstract = "Turbulent flow inside a modified differentially heated cavity at high Rayleigh number (Ra ~ 10 9 ) has been studied through fully resolved direct numerical simulation (DNS) using the high-order spectral element method code Nek5000. The flow configuration includes two separate physical phenomena: the natural recirculation itself, and the flow inside a curved channel. Simulations have been carried out using both the Boussinesq approximation and the low-Mach compressible formulation. Significant discrepancies between the two methods inform of the extreme caution that should be exercised when using the Boussinesq approximation in the limits of its applicability. The DNS solutions are analyzed in terms of polynomial-order convergence and Reynolds stress budgets, and the turbulence quantities and velocity profiles are presented as a reference for the validation of turbulence models.",
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Direct Numerical Simulation of Turbulent Flow Inside a Differentially Heated Composite Cavity. / Martínez, Javier; Merzari, Elia; Acton, Michael; Baglietto, Emilio.

In: Nuclear Technology, 01.01.2019.

Research output: Contribution to journalArticle

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