A turbulence model for buoyant flows based on vorticity generation.

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Description

A turbulence model for buoyant flows has been developed in the context of a k-{var_epsilon} turbulence modeling approach. A production term is added to the turbulent kinetic energy equation based on dimensional reasoning using an appropriate time scale for buoyancy-induced turbulence taken from the vorticity conservation equation. The resulting turbulence model is calibrated against far field helium-air spread rate data, and validated with near source, strongly buoyant helium plume data sets. This model is more numerically stable and gives better predictions over a much broader range of mesh densities than the standard k-{var_epsilon} model for these strongly buoyant flows.

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36 p.

Creation Information

Domino, Stefan Paul; Nicolette, Vernon F.; O'Hern, Timothy John; Tieszen, Sheldon R. & Black, Amalia Rebecca October 1, 2005.

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Description

A turbulence model for buoyant flows has been developed in the context of a k-{var_epsilon} turbulence modeling approach. A production term is added to the turbulent kinetic energy equation based on dimensional reasoning using an appropriate time scale for buoyancy-induced turbulence taken from the vorticity conservation equation. The resulting turbulence model is calibrated against far field helium-air spread rate data, and validated with near source, strongly buoyant helium plume data sets. This model is more numerically stable and gives better predictions over a much broader range of mesh densities than the standard k-{var_epsilon} model for these strongly buoyant flows.

Physical Description

36 p.

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  • Report No.: SAND2005-6273
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/875637 | External Link
  • Office of Scientific & Technical Information Report Number: 875637
  • Archival Resource Key: ark:/67531/metadc881190

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • October 1, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

Description Last Updated

  • Dec. 9, 2016, 12:03 a.m.

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Domino, Stefan Paul; Nicolette, Vernon F.; O'Hern, Timothy John; Tieszen, Sheldon R. & Black, Amalia Rebecca. A turbulence model for buoyant flows based on vorticity generation., report, October 1, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc881190/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.