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Research Papers: Flows in Complex Systems

Simulations of Twin Turbulent Planar-Like Jets Injected Into a Large Volume Using RANS

[+] Author and Article Information
Lane B. Carasik

Mem. ASME
Department of Nuclear Engineering,
Texas A&M University,
College Station, TX 77843-3133
e-mail: lane.carasik@gmail.com

Huhu Wang

Mem. ASME
Department of Nuclear Engineering,
Texas A&M University,
College Station, TX 77843-3133
e-mail: huhuwang2009@gmail.com

Yassin A. Hassan

Fellow ASME
Department of Nuclear Engineering,
Texas A&M University,
College Station, TX 77843-3133
e-mail: y-hassan@tamu.edu

1Present Address: Kairos Power, LLC, Oakland, CA 94607.

2Present address: Exa Corporation, Livonia, MI 48152.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 18, 2018; final manuscript received May 4, 2018; published online June 26, 2018. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 140(12), 121108 (Jun 26, 2018) (12 pages) Paper No: FE-18-1031; doi: 10.1115/1.4040231 History: Received January 18, 2018; Revised May 04, 2018

The complex behavior of thermal fluids in nuclear reactors require the usage of computational fluid dynamics (CFD) codes for design and analysis. In order to use CFD codes, they require regular benchmark problems to ensure the predictions are reasonable representations of reality. The twin jet water facility (TJWF) designed and built at the University of Tennessee, Knoxville was created for this purpose. The facility features twin planar-like turbulent free shear jets injecting fluid into a transparent tank to study a variety of flow behavior. The experimental work using this facility by Texas A&M University was used for the benchmarking activities. This work was conducted using a steady Reynolds-averaged Navier–Stokes formulation to simulate the flow behavior. It was determined that the standard k–ε and elliptic blending Reynolds stress model (EBRSM) turbulence models can be used to simulate the twin jet behavior with reasonable success for design and analysis activities.

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Figures

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Fig. 1

Geometric parameters and basic flow behavior of twin free shear turbulent planar-like jets [19]

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Fig. 2

Diagram of the TJWF

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Fig. 3

Simplified TJWF geometry used for simulations

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Fig. 4

Meshing scheme for twin jet simulations on the coarsest mesh

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Fig. 5

Centerline streamwise velocities and associated absolute error for each mesh

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Fig. 6

Streamwise velocity profile and associated absolute error in the area of highest gradients

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Fig. 7

y-vorticity profiles and associated absolute error at the area of highest gradients

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Fig. 8

Analytical solutions of Tollmein and Goertler for turbulent planar jet comparison to M4 mesh results

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Fig. 9

Streamwise velocity profiles at different characteristic heights

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Fig. 10

Reynolds stress profiles at different characteristic heights

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Fig. 11

Location of measurement points for use of determining experimental uncertainty overlaid on the standard kε turbulence velocity field

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Fig. 12

Velocity signals of stream-wise and span-wise components at Z /a = 34.48, X /a = 0.52

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