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: Analysis of Boundary-Layer Instabilities in Hypersonic, Three-Dimensional Flows
  name:
    name part: Riha, Andrew Kelly
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Reed, Helen
    role:
      role term: thesis advisor.
  name:
    name part: Texas A&M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2023
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Spatial BiGlobal (SBG) theory was used to study boundary-layer transition on a hypersonic ﬁnned cone. A new solver, BLAST, has been developed to apply the equations in a nonorthogonal manner, which extends its applicability to realistic ﬂight vehicles. After veriﬁcation of the code with previous literature, it was applied to the ﬁnned cone at conditions corresponding to quiet wind-tunnel experiments. Boundary-layer instabilities in a horseshoe vortex emanating from the ﬁn-cone intersection are the focus of this study. Through this investigation, opportunities for improvement were identiﬁed regarding SBG and its interpretation. Speciﬁcally, the deﬁnition of the N factor was used to account for general-group velocity directions. The nonorthogonal equations were used to decouple the orientation of the stability grid from the direction of minimum basic-state change, which allows more control over the most important assumption inherent in spatial BiGlobal. This formulation also allowed computation of the ﬁrst SBG results to fully include a geometric feature like a full ﬁn in its domain, which is found to be necessary to achieve accurate solutions. The effects of other choices were examined as well, such as the inclusion of streamwise curvature, placement of the azimuthal boundaries, and choice of growth direction. Best practices are developed and discussed. SBG results are compared with experiments where possible, with particularly good agreement found for a laminar experimental condition at Mach 6 and Re′ = 5.9 × 10^6 m^-1. The correct frequencies are predicted as most-ampliﬁed in different regions of the vortex, with the hand-off from one dominant frequency to the other also correctly reproduced computationally. Features of these instabilities are identiﬁed, along with their characteristics and how they are affected by the basic state. The electronic version of this dissertation is accessible from https://hdl.handle.net/1969.1/198502
  note: by Andrew Riha.
  note: "Major Subject: Aerospace Engineering"
  note: Includes vita.
  note: Doctor of Philosophy Texas A&M University 2022 https://hdl.handle.net/1969.1/198502
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Aerospace Engineering
  subject:
    topic: boundary layer
  subject:
    topic: stability
  subject:
    topic: spatial BiGlobal
  subject:
    topic: hypersonic
  subject:
    topic: transition
  identifier: https://hdl.handle.net/1969.1/198502
  record info:
    record content source: TXA
    record creation date: 240924
    record change date: 20250326141433.4
    record identifier: in00005621405
    language of cataloging:
      language term: eng