Large Eddy Simulations of scaled HTGR lower plenum for assessment of turbulent mixing

Salkhordeh, Sasan; Clifford, Corey E.; Jana, Anirban; Kimber, Mark

doi:10.1016/j.nucengdes.2018.04.016

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…As shown by Yuan et al 53 such analyses allow the visualization of secondary flows and the measurement of flow-induced vibrations in SGs. Wallresolved LES was also used by Salkhordeh et al 54 to investigate the turbulent mixing in the lower plenum of a high-temperature gas-cooled reactor.…”

Section: Wall-resolved Les In Nuclear Thermal Hydraulics: Some Examentioning

confidence: 99%

Direct Numerical Simulation and Wall-Resolved Large Eddy Simulation in Nuclear Thermal Hydraulics

2019

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The critical review discusses the most accurate methods for description of turbulent flows: the computationally very expensive direct numerical simulation (DNS) and slightly less accurate and slightly less expensive large eddy simulation (LES) methods. Both methods have found their way into nuclear thermal hydraulics as tools for studies of the fundamental mechanisms of turbulence and turbulent heat transfer. In the first section of this critical review, both methods are briefly introduced in parallel with the basic properties of the turbulent flows. The focus is on the DNS method, the so-called quasi-DNS approach, and the coarsest turbulence modeling approach discussed in this work, which is still on the very small-scale, wall-resolved LES. Other, coarser turbulence modeling approaches (such as wall-modeled LES, Reynolds Averaged Navier-Stokes (RANS)/LES hybrids, or RANS) are beyond the scope of the present work. Section II answers the question: "How do the DNS and LES methods work?" A short discussion of the computational requirements, numerical approaches, and computational tools is included. Section III is about the interpretation of the DNS and LES results and statistical uncertainties. Sections IV and V give some examples of the DNS and wall-resolved LES results relevant for nuclear thermal hydraulics. The last section lists the conclusions and some of the challenges that might be tackled with the most accurate techniques like DNS and LES.

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Section: Wall-resolved Les In Nuclear Thermal Hydraulics: Some Examentioning

confidence: 99%

Direct Numerical Simulation and Wall-Resolved Large Eddy Simulation in Nuclear Thermal Hydraulics

2019

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“…The single round jet has received extensive devotion in the literature due to its existence in a variety of real-world applications. The study of such jets exist in fields relative to the design of electronic component cooling [1][2][3][4], the mixing of hot and cold fluid streams [5][6][7][8], and for this particular study, a preliminary analysis of importance in very high temperature reactors (VHTR).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Comparison of Single and Multiple-Jet Impingement on a Flat Plate

Reed

Weiss

Kristo

et al. 2020

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)

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Jet impingement onto a solid boundary is of practical interest in a variety of engineering applications. The novelty of the current work is in the comparison of the single and multiple inline jets, the latter being more prevalent in application but less examined in the literature. The study focuses explicitly on the incompressible, hydraulic comparison, by performing experiments near room temperature and low speeds. Three round jets of diameter 22.23 mm are placed inline and 2 diameters apart on the ceiling of the test section. The jets issue vertically downward into a pseudo-unconfined domain whose bottom surface is 9.8 diameters from the jet outlets, acting as the plate. Three distinct flow rates are measured via Stereoscopic Particle Image Velocimetry (S-PIV) for both the single jet and triple jet geometries, where for the latter, each outlet is set to an equivalent flow rate. Several reference parameters further delineate fluid properties in the test section and ambient environment. The investigation begins with evaluation of the single jet, comparing first and second order turbulence statistics with existing literature. The triple jet cases are then presented, showing dramatically different behavior. The results of each configuration, inlet profiles, reference parameters, and uncertainty quantification are provided to embolden future work in computational fluid dynamics (CFD). The investigation concludes with the promotion of several comparisons of the single and triple jet setup and is meant to provide insight into the expected dynamic response of the fluid near and along the solid boundary.

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Reynolds Number Dependence of Higher Order Statistics for Round Turbulent Jets Using Large Eddy Simulations

Salkhordeh

Mazumdar

Jana

et al. 2018

Flow Turbulence Combust

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Large Eddy Simulations of scaled HTGR lower plenum for assessment of turbulent mixing

Cited by 10 publications

References 22 publications

Direct Numerical Simulation and Wall-Resolved Large Eddy Simulation in Nuclear Thermal Hydraulics

Direct Numerical Simulation and Wall-Resolved Large Eddy Simulation in Nuclear Thermal Hydraulics

Hydraulic Comparison of Single and Multiple-Jet Impingement on a Flat Plate

Reynolds Number Dependence of Higher Order Statistics for Round Turbulent Jets Using Large Eddy Simulations

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