Analysis of coherent structures in Rayleigh–Bénard convection

Sangro Park, Changhoon Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Using direct numerical simulation, we investigate characteristics of coherent structures in Rayleigh–Bénard convection in a soft turbulence regime. The role of thermal plumes, essential structures in Rayleigh–Bénard convection, is studied by splitting flow regimes into thermal plume and background by investigating joint probability density function (PDF) of invariants of velocity gradient tensor. The contribution to thermal dissipation rate by these two regions is analysed separately. Through the joint PDF of invariants, we also examine the thermal effect on velocity structures.

Original languageEnglish
Pages (from-to)1162-1178
Number of pages17
JournalJournal of Turbulence
Volume16
Issue number12
DOIs
Publication statusPublished - 2015 Dec 2

Fingerprint

Thermal plumes
probability density functions
Probability density function
plumes
convection
Direct numerical simulation
direct numerical simulation
Thermal effects
Tensors
temperature effects
Turbulence
dissipation
turbulence
tensors
gradients
Convection

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)

Cite this

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Analysis of coherent structures in Rayleigh–Bénard convection. / Park, Sangro; Lee, Changhoon.

In: Journal of Turbulence, Vol. 16, No. 12, 02.12.2015, p. 1162-1178.

Research output: Contribution to journalArticle

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AU - Lee, Changhoon

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AB - Using direct numerical simulation, we investigate characteristics of coherent structures in Rayleigh–Bénard convection in a soft turbulence regime. The role of thermal plumes, essential structures in Rayleigh–Bénard convection, is studied by splitting flow regimes into thermal plume and background by investigating joint probability density function (PDF) of invariants of velocity gradient tensor. The contribution to thermal dissipation rate by these two regions is analysed separately. Through the joint PDF of invariants, we also examine the thermal effect on velocity structures.

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