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Time-accurate computational fluid dynamics modeling of the LHA ship airwake
KTH, School of Engineering Sciences (SCI).
2018 (English)In: Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018, Australasian Fluid Mechanics Society , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Extensive research in the past two decades has shown that flow around the sharp edges of bluff bodies, such as the superstructure of a ship, can cause large scale shear-layer separations with increased turbulence, generating a highly unsteady flow in the airwake region. Such separations affect the control margins and handling loading of a rotorcraft, mainly if operating from the vicinity of a flight deck, and therefore negatively influence the rotorcraft operating limits. Improved Delayed Detached-Eddy Simulations (IDDES) of the ship airwake were conducted with three different grid levels, the highest being the largest computation to date of the US Landing Helicopter Assault (LHA) ship. Computations were undertaken using the open-source unstructured grid Navier-Stokes CFD software OpenFOAM. Results detail the mean flow and discuss highly-detailed vortical structures and inherent unsteadiness of the LHA ship airwake. Understanding these vortical structures is critical to enabling safe helicopter operations around such vessels.

Place, publisher, year, edition, pages
Australasian Fluid Mechanics Society , 2018.
Keywords [en]
Fluid mechanics, Helicopter services, Navier Stokes equations, Open source software, Open systems, Shear flow, Ships, Vorticity, Computational fluid dynamics modeling, Helicopter operation, Improved delayed detached eddy simulations, Landing helicopter assaults, Operating limit, Ship airwakes, Unstructured grid, Vortical structures, Computational fluid dynamics
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-268518Scopus ID: 2-s2.0-85075212794ISBN: 9780646597843 (print)OAI: oai:DiVA.org:kth-268518DiVA, id: diva2:1413554
Conference
21st Australasian Fluid Mechanics Conference, AFMC 2018, 10 December 2018 through 13 December 2018
Note

QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10Bibliographically approved

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Cvengros, Matús

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
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More languages
Output format
  • html
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  • asciidoc
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