rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: New near-wall models with dynamic subgrid scale closure for large eddy simulation in curvilinear coordinates for complex geometries
  name:
    name part: Barsamian, Hagop Raffi
    name part: 1970-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2000
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xix, 189 leaves : illustrations ; 28 cm.
  abstract: This dissertation presents modifications and improvements to the dynamic subgrid scale model and introduces a new wall model. These are applied to the large eddy simulation technique in curvilinear coordinates. They are then validated and tested in three-dimensional complex geometries. The large eddy simulation method captures many scales of turbulence up to the grid size. A closure model is used to simulate subgrid turbulence. The Smagorinsky and dynamic subgrid models are presented and tested. The dynamic model overcomes many of the deficiencies of the Smagorinsky subgrid scale model. Spatial and temporal low-pass filters have been introduced in the dynamic subgrid scale model for numerical stability. No practical differences have been observed between the Smagorinsky and dynamic models. Several near-wall models are considered for the large eddy simulation technique. A local averaging technique makes these models applicable to complex geometries. A new model is introduced which overcomes planar averaging near the wall and captures ejection and sweep effects. Special treatment of inlet boundary conditions was introduced. These models have been implemented in a large eddy simulation computer program that uses a strongly conservative curvilinear coordinate formulation. The covariant projections are used as the dependent variables in a staggered methodology. The body fitted grids are advantageous in complex geometry descriptions. Results are validated in a lid driven cavity flow at Reynolds number of 10000. A single tube in a channel is simulated to show the applicability of the models to complex geometries with attachment and separation as well as end-wall effects. The shedding effect was captured and turbulence characteristics were acceptable. One million nodes were used in a large eddy simulation of a three-dimensional tube bundle at Reynolds number of 21700. Results are presented in the form of visualization and compared with available experimental data. The 'flap…
  note: by Hagop Raffi Barsamian.
  note: Vita.
  note: "Major Subject: Nuclear Engineering".
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 2001.
  note: Includes bibliographical references (leaves 179-189).
  subject:
    topic: Major nuclear engineering
  identifier: 99-80114 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 020204
    record change date: 20190325102935.0
    record identifier: in00001645720