Validation of a simple turbulence model suitable for closure of temporally-filtered Navier-Stokes equations using a helium plume.

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A validation study has been conducted for a turbulence model used to close the temporally filtered Navier Stokes (TFNS) equations. A turbulence model was purposely built to support fire simulations under the Accelerated Strategic Computing (ASC) program. The model was developed so that fire transients could be simulated and it has been implemented in SIERRA/Fuego. The model is validated using helium plume data acquired for the Weapon System Certification Campaign (C6) program in the Fire Laboratory for Model Accreditation and Experiments (FLAME). The helium plume experiments were chosen as the first validation problem for SIERRA/Fuego because they embody the first ... continued below

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58 p.

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Tieszen, Sheldon Robert; Domino, Stefan Paul & Black, Amalia Rebecca June 1, 2005.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 18 times , with 4 in the last month . More information about this report can be viewed below.

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Description

A validation study has been conducted for a turbulence model used to close the temporally filtered Navier Stokes (TFNS) equations. A turbulence model was purposely built to support fire simulations under the Accelerated Strategic Computing (ASC) program. The model was developed so that fire transients could be simulated and it has been implemented in SIERRA/Fuego. The model is validated using helium plume data acquired for the Weapon System Certification Campaign (C6) program in the Fire Laboratory for Model Accreditation and Experiments (FLAME). The helium plume experiments were chosen as the first validation problem for SIERRA/Fuego because they embody the first pair-wise coupling of scalar and momentum fields found in fire plumes. The validation study includes solution verification through grid and time step refinement studies. A formal statistical comparison is used to assess the model uncertainty. The metric uses the centerline vertical velocity of the plume. The results indicate that the simple model is within the 95% confidence interval of the data for elevations greater than 0.4 meters and is never more than twice the confidence interval from the data. The model clearly captures the dominant puffing mode in the fire but under resolves the vorticity field. Grid dependency of the model is noted.

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58 p.

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  • Report No.: SAND2005-3210
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/923079 | External Link
  • Office of Scientific & Technical Information Report Number: 923079
  • Archival Resource Key: ark:/67531/metadc895258

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  • June 1, 2005

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

Description Last Updated

  • Dec. 2, 2016, 6:05 p.m.

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Tieszen, Sheldon Robert; Domino, Stefan Paul & Black, Amalia Rebecca. Validation of a simple turbulence model suitable for closure of temporally-filtered Navier-Stokes equations using a helium plume., report, June 1, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc895258/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.