On the geometry of two-dimensional slices of irregular level sets in turbulent flows Metadata

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Title

  • Main Title On the geometry of two-dimensional slices of irregular level sets in turbulent flows

Creator

  • Author: Catrakis, H.J.
    Creator Type: Personal
  • Author: Cook, A.W.
    Creator Type: Personal
  • Author: Dimotakis, P.E.
    Creator Type: Personal
  • Author: Patton, J.M.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of the Assistant Secretary for Defense Programs.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Defense Programs (DP) (United States)

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: California
    Additional Info: Lawrence Livermore National Lab., CA (United States)

Date

  • Creation: 1998-03-20

Language

  • English

Description

  • Content Description: Isoscalar surfaces in turbulent flows are found to be more complex than (self-similar) fractals, in both the far field of liquid-phase turbulent jets and in a realization of Rayleigh-Taylor-instability flow. In particular, they exhibit a scale-dependent coverage dimension, D{sub 2}((lambda)), for 2-D slices of scalar level sets, that increases with scale, from unity, at small scales, to 2, at large scales. For the jet flow and Reynolds numbers investigated, the isoscalar-surface geometry is both scalar-threshold- and Re-dependent; the level-set (coverage) length decreases with increasing Re, indicating enhanced mixing with increasing Reynolds number; and the size distribution of closed regions is well described by lognormal statistics at small scales. A similar D{sub 2}((lambda)) behavior is found for level-set data of 3-D density-interface behavior in recent direct numerical-simulation studies of Rayleigh-Taylor-instability flow. A comparison of (spatial) spectral and isoscalar coverage statistics will be disc
  • Physical Description: 1.2 Megabytes pages

Subject

  • Keyword: Turbulent Flow
  • Keyword: Fluid Mechanics
  • Keyword: Statistics
  • Keyword: Rayleigh-Taylor Instability
  • Keyword: Scalars
  • Keyword: Geometry
  • Keyword: Fractals
  • STI Subject Categories: 42 Engineering
  • Keyword: Reynolds Number
  • Keyword: Distribution

Source

  • Conference: American Physical Society Division of Fluid Dynamics, Philadelphia, PA (US), 11/22/1998--11/14/1998

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: UCRL-JC-131726
  • Report No.: DP0101031
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 2861
  • Archival Resource Key: ark:/67531/metadc664330