Assessment of Hybrid RANS/LES Models in Heat and Fluid Flows around Staggered Pin-Fin Arrays

In the present work, the three-dimensional heat and fluid flows around staggered pin-fin arrays are predicted using two hybrid RANS/LES models (an improved delayed detached eddy simulation (IDDES) model and a stress-blended eddy simulation (SBES) model), and one transitional unsteady Reynolds averag...

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Bibliographic Details
Published in:Energies (Basel) 2020-07, Vol.13 (14), p.3752
Main Authors: Kim, Byeong-Cheon, Chang, Kyoungsik
Format: Article
Language:English
Subjects:
Agreements
Arrays
Blending effects
Computational fluid dynamics
Computer simulation
Detached eddy simulation
Fluid dynamics
Fluid flow
Geometry
Heat transfer
hybrid RANS/LES
improved delayed detached eddy simulation (IDDES)
k-ω SSTLM
Numerical analysis
Pin fins
Random variables
Reynolds averaged Navier-Stokes method
Reynolds number
Shear stress
Simulation
staggered pin-fin arrays
stress-blended eddy simulation (SBES)
Three dimensional flow
Turbines
Turbulence models
Velocity
Velocity distribution
Vortices
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Summary:In the present work, the three-dimensional heat and fluid flows around staggered pin-fin arrays are predicted using two hybrid RANS/LES models (an improved delayed detached eddy simulation (IDDES) model and a stress-blended eddy simulation (SBES) model), and one transitional unsteady Reynolds averaged Navier-Stokes (URANS) model, called k-ω SSTLM. The periodic segment geometry with a total of nine pins is considered with a channel height of 2D and a distance of 2.5D between each pin. The corresponding Reynolds number based on the pin diameter and the maximum velocity between pins is 10,000. The two hybrid RANS/LES results show the superior prediction of the mean velocity profiles around the pins, pressure distributions on the pin wall, and Nusselt number distributions. However, the transitional model, k-ω SSTLM, shows large discrepancies except in front of the pins where the flow is not fully developed. The vortical structures are well resolved by the two hybrid RANS/LES models. The SBES model is particularly adept at capturing the 3-D vortex structures after the pins. The effects of the blending function switching between RANS and LES mode of the two hybrid RANS/LES models are also investigated.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13143752