Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches

A. Kraus, S. Aithal, A. Obabko, E. Merzari, A. Tomboulides, Paul Fischer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In light of the Fukushima accident, significant research effort has been focused on containment thermal- hydraulics and gaseous mixing. In one such effort, the recent OECD/NEA-PSI Computational Fluid Dynamics (CFD) Benchmark "PANDA", an initially stratified air-helium layer is gradually eroded by a turbulent round jet (Re = 20000) of primarily air. Mole fraction and temperature readings were taken at various points throughout the domain to record the erosion behavior, and mean and RMS velocity profiles were averaged over a long transient time. These data were the basis for comparison with CFD results from Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Large-Eddy (LES) simulations. URANS two-species simulations were run with STAR-CCM+ focusing on the Realizable k-s turbulence model and low-Mach approximation under ideal gas conditions. The LES calculations were performed with the spectral-element open-source highly-scalable code Nek5000 using both a Boussinesq and low- Mach-number approximation that involved a new computational framework for handling multi-species diffusion and transport. URANS results for the mole fractions over time and averaged flow profiles showed reasonable agreement with the available experimental results for nearly all available measurements. The initial LES results demonstrated the new code capability and some early-time behavior restricted by long integration time due to a vast range of spatial and temporal scales. Nevertheless, these results can be used to improve turbulence modeling for the URANS approach that as shown here is an appropriate tool for future analyses of this type of transient flow.

LanguageEnglish (US)
Title of host publicationInternational Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015
PublisherAmerican Nuclear Society
Pages1448-1461
Number of pages14
Volume2
ISBN (Electronic)9781510811843
StatePublished - Jan 1 2015
Event16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015 - Chicago, United States
Duration: Aug 30 2015Sep 4 2015

Other

Other16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015
CountryUnited States
CityChicago
Period8/30/159/4/15

Fingerprint

turbulent jets
strata
Mach number
erosion
Erosion
Computational fluid dynamics
Large eddy simulation
computational fluid dynamics
Air
Turbulence models
Helium
Accidents
Turbulence
simulation
species diffusion
Hydraulics
containment
air
turbulence models
ideal gas

Keywords

  • Large eddy simulation
  • Low-Mach number
  • Species mixing
  • Stratification erosion
  • Turbulent jet

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear Energy and Engineering

Cite this

Kraus, A., Aithal, S., Obabko, A., Merzari, E., Tomboulides, A., & Fischer, P. (2015). Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches. In International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015 (Vol. 2, pp. 1448-1461). American Nuclear Society.

Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches. / Kraus, A.; Aithal, S.; Obabko, A.; Merzari, E.; Tomboulides, A.; Fischer, Paul.

International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. Vol. 2 American Nuclear Society, 2015. p. 1448-1461.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kraus, A, Aithal, S, Obabko, A, Merzari, E, Tomboulides, A & Fischer, P 2015, Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches. in International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. vol. 2, American Nuclear Society, pp. 1448-1461, 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015, Chicago, United States, 8/30/15.
Kraus A, Aithal S, Obabko A, Merzari E, Tomboulides A, Fischer P. Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches. In International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. Vol. 2. American Nuclear Society. 2015. p. 1448-1461
Kraus, A. ; Aithal, S. ; Obabko, A. ; Merzari, E. ; Tomboulides, A. ; Fischer, Paul. / Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches. International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. Vol. 2 American Nuclear Society, 2015. pp. 1448-1461
@inproceedings{cef9ff9dfc6643fa99a0f983d21b83eb,
title = "Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches",
abstract = "In light of the Fukushima accident, significant research effort has been focused on containment thermal- hydraulics and gaseous mixing. In one such effort, the recent OECD/NEA-PSI Computational Fluid Dynamics (CFD) Benchmark {"}PANDA{"}, an initially stratified air-helium layer is gradually eroded by a turbulent round jet (Re = 20000) of primarily air. Mole fraction and temperature readings were taken at various points throughout the domain to record the erosion behavior, and mean and RMS velocity profiles were averaged over a long transient time. These data were the basis for comparison with CFD results from Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Large-Eddy (LES) simulations. URANS two-species simulations were run with STAR-CCM+ focusing on the Realizable k-s turbulence model and low-Mach approximation under ideal gas conditions. The LES calculations were performed with the spectral-element open-source highly-scalable code Nek5000 using both a Boussinesq and low- Mach-number approximation that involved a new computational framework for handling multi-species diffusion and transport. URANS results for the mole fractions over time and averaged flow profiles showed reasonable agreement with the available experimental results for nearly all available measurements. The initial LES results demonstrated the new code capability and some early-time behavior restricted by long integration time due to a vast range of spatial and temporal scales. Nevertheless, these results can be used to improve turbulence modeling for the URANS approach that as shown here is an appropriate tool for future analyses of this type of transient flow.",
keywords = "Large eddy simulation, Low-Mach number, Species mixing, Stratification erosion, Turbulent jet",
author = "A. Kraus and S. Aithal and A. Obabko and E. Merzari and A. Tomboulides and Paul Fischer",
year = "2015",
month = "1",
day = "1",
language = "English (US)",
volume = "2",
pages = "1448--1461",
booktitle = "International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015",
publisher = "American Nuclear Society",

}

TY - GEN

T1 - Erosion of a large-scale gaseous stratified layer by a turbulent jet - Simulations with URANS and LES approaches

AU - Kraus, A.

AU - Aithal, S.

AU - Obabko, A.

AU - Merzari, E.

AU - Tomboulides, A.

AU - Fischer, Paul

PY - 2015/1/1

Y1 - 2015/1/1

N2 - In light of the Fukushima accident, significant research effort has been focused on containment thermal- hydraulics and gaseous mixing. In one such effort, the recent OECD/NEA-PSI Computational Fluid Dynamics (CFD) Benchmark "PANDA", an initially stratified air-helium layer is gradually eroded by a turbulent round jet (Re = 20000) of primarily air. Mole fraction and temperature readings were taken at various points throughout the domain to record the erosion behavior, and mean and RMS velocity profiles were averaged over a long transient time. These data were the basis for comparison with CFD results from Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Large-Eddy (LES) simulations. URANS two-species simulations were run with STAR-CCM+ focusing on the Realizable k-s turbulence model and low-Mach approximation under ideal gas conditions. The LES calculations were performed with the spectral-element open-source highly-scalable code Nek5000 using both a Boussinesq and low- Mach-number approximation that involved a new computational framework for handling multi-species diffusion and transport. URANS results for the mole fractions over time and averaged flow profiles showed reasonable agreement with the available experimental results for nearly all available measurements. The initial LES results demonstrated the new code capability and some early-time behavior restricted by long integration time due to a vast range of spatial and temporal scales. Nevertheless, these results can be used to improve turbulence modeling for the URANS approach that as shown here is an appropriate tool for future analyses of this type of transient flow.

AB - In light of the Fukushima accident, significant research effort has been focused on containment thermal- hydraulics and gaseous mixing. In one such effort, the recent OECD/NEA-PSI Computational Fluid Dynamics (CFD) Benchmark "PANDA", an initially stratified air-helium layer is gradually eroded by a turbulent round jet (Re = 20000) of primarily air. Mole fraction and temperature readings were taken at various points throughout the domain to record the erosion behavior, and mean and RMS velocity profiles were averaged over a long transient time. These data were the basis for comparison with CFD results from Unsteady Reynolds-Averaged Navier-Stokes (URANS) and Large-Eddy (LES) simulations. URANS two-species simulations were run with STAR-CCM+ focusing on the Realizable k-s turbulence model and low-Mach approximation under ideal gas conditions. The LES calculations were performed with the spectral-element open-source highly-scalable code Nek5000 using both a Boussinesq and low- Mach-number approximation that involved a new computational framework for handling multi-species diffusion and transport. URANS results for the mole fractions over time and averaged flow profiles showed reasonable agreement with the available experimental results for nearly all available measurements. The initial LES results demonstrated the new code capability and some early-time behavior restricted by long integration time due to a vast range of spatial and temporal scales. Nevertheless, these results can be used to improve turbulence modeling for the URANS approach that as shown here is an appropriate tool for future analyses of this type of transient flow.

KW - Large eddy simulation

KW - Low-Mach number

KW - Species mixing

KW - Stratification erosion

KW - Turbulent jet

UR - http://www.scopus.com/inward/record.url?scp=84962631262&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84962631262&partnerID=8YFLogxK

M3 - Conference contribution

VL - 2

SP - 1448

EP - 1461

BT - International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015

PB - American Nuclear Society

ER -