Direct Numerical Simulation of a buoyant triple jet at low-Prandtl number

Fregni, Andrea; Angeli, Diego; Cimarelli, Andrea; Stalio, Enrico

doi:10.1016/j.ijheatmasstransfer.2019.118466

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…In figure 9, a selection of statistics is reported, values are given in their non-dimensional form, see ref. [28] for the mathematical formulation and reference quantities. For convenience, data are presented in a region smaller than the computational domain, (x, y) ∈ [0, 20] × [0, 10].…”

Section: Selected Resultsmentioning

confidence: 99%

“…As Incompact3d originally implements only passive scalar transport, the buoyancy term according to the Boussinesq approximation has been implemented for the present study. A validation test reported in [28] indicates that buoyancy forces have been implemented without errors.…”

Section: Methodsmentioning

confidence: 99%

“…Besides the addition of the buoyancy term, inflow and outflow boundary conditions have been developed specifically, see ref. [28].…”

Section: Methodsmentioning

confidence: 99%

“…In this way, the inflow turbulence is realistically generated rather than reproduced by synthetic methods. Further details about precursor channel simulation can be found in paper [28].…”

Section: Methodsmentioning

confidence: 99%

“…A critical discussion of the domain spanwise size based upon two-point spatial correlations can be found in ref. [28].…”

Section: Methodsmentioning

confidence: 99%

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Direct Numerical Simulation of natural, mixed and forced convection in liquid metals: selected results

Fregni

Angeli

Cimarelli

et al. 2022

Nuclear Engineering and Design

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Selected results of three Direct Numerical Simulations are presented, on relevant test cases for the thermal hydraulics of liquid-metal-cooled nuclear reactors, encompassing a wide spectrum of turbulent convection regimes. The first test case is a Rayleigh-Bénard cell at a Grashof number Gr = 5×10 7 , representative of the conditions in the unstably stratified layer of coolant in a reactor pool in both standard operating conditions and emergency situations, e.g. shutdown of the cooling system. The second case is the mixed convection in a cold-hot-cold triple jet configuration, representative of liquid streams exiting from the core into the pool, and relevant for the modeling of thermal striping and thermal fatigue phenomena on the vessel containment walls. The third case is the fully-developed flow in a vertical bare rod bundle with triangular arrangement and a pitch-to-diameter ratio P/D = 1.4, in both forced and mixed convection conditions. These regimes respectively represent normal operation or decay heat removal conditions in reactor cores. The availability of these numerical databases will allow for an in-depth analysis of the turbulent flow and heat transfer in liquid metals under different convection regimes, and is also relevant for the development, calibration and validation of turbulent heat transfer models.

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Section: Selected Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Besides the addition of the buoyancy term, inflow and outflow boundary conditions have been developed specifically, see ref. [28].…”

Section: Methodsmentioning

confidence: 99%

“…In this way, the inflow turbulence is realistically generated rather than reproduced by synthetic methods. Further details about precursor channel simulation can be found in paper [28].…”

Section: Methodsmentioning

confidence: 99%

“…A critical discussion of the domain spanwise size based upon two-point spatial correlations can be found in ref. [28].…”

Section: Methodsmentioning

confidence: 99%

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