Large eddy simulations of flow inside a cubical differentially heated cavity under realistic boundary conditions

A. Dehbi, F. Han, Jarmo Kalilainen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

A series of analytical and experimental studies have been conducted at the Paul Scherrer Institut (PSI) to investigate particulate flows inside a model containment consisting of a differentially heated cubical cavity (DHC). Lately, LES simulations were performed using the finite volume ANSYS Fluent CFD code at Rayleigh number 109. After initial confrontation of the predicted fluid field against experimental data, it was concluded that important physical phenomena had not been accounted for in the original pre-test simulations. Namely, radiation and wall conduction in the test section were not negligible and contributed to producing a fluid field that departed in significant ways from that obtained assuming idealized boundary conditions. We show hereafter that the LES predictions with realistic boundary conditions, including radiation and conduction, are in good overall agreement with the experimental mean velocity and temperature fields. In particular, we show that radiation increases turbulence, which in turn increases mixing and reduces the thermal stratification in the cavity. We also find that the velocity rms peaks near the vertical walls are well captured with the realistic boundary conditions (typically within 30%), in contrast to the previous ideal simulations which miss these peaks by a factor 3 to 4
Original languageEnglish
Title of host publicationInternational Congress on Advances in Nuclear Power Plants, ICAPP 2014
Subtitle of host publicationProceedings
Pages1963-1970
Volume1
ISBN (Electronic)978-0-89448-776-7
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Congress on Advances in Nuclear Power Plants, ICAPP 2014 - Charlotte, United States
Duration: 6 Apr 20149 Apr 2014

Publication series

Name
Volume3

Conference

ConferenceInternational Congress on Advances in Nuclear Power Plants, ICAPP 2014
Abbreviated titleICAPP 2014
CountryUnited States
CityCharlotte
Period6/04/149/04/14

Fingerprint

large eddy simulation
boundary conditions
cavities
radiation
conduction
containment
simulation
fluids
Rayleigh number
charge flow devices
stratification
particulates
temperature distribution
velocity distribution
turbulence
predictions

Cite this

Dehbi, A., Han, F., & Kalilainen, J. (2014). Large eddy simulations of flow inside a cubical differentially heated cavity under realistic boundary conditions. In International Congress on Advances in Nuclear Power Plants, ICAPP 2014: Proceedings (Vol. 1, pp. 1963-1970). [14263]
Dehbi, A. ; Han, F. ; Kalilainen, Jarmo. / Large eddy simulations of flow inside a cubical differentially heated cavity under realistic boundary conditions. International Congress on Advances in Nuclear Power Plants, ICAPP 2014: Proceedings. Vol. 1 2014. pp. 1963-1970
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Dehbi, A, Han, F & Kalilainen, J 2014, Large eddy simulations of flow inside a cubical differentially heated cavity under realistic boundary conditions. in International Congress on Advances in Nuclear Power Plants, ICAPP 2014: Proceedings. vol. 1, 14263, pp. 1963-1970, International Congress on Advances in Nuclear Power Plants, ICAPP 2014, Charlotte, United States, 6/04/14.

Large eddy simulations of flow inside a cubical differentially heated cavity under realistic boundary conditions. / Dehbi, A.; Han, F.; Kalilainen, Jarmo.

International Congress on Advances in Nuclear Power Plants, ICAPP 2014: Proceedings. Vol. 1 2014. p. 1963-1970 14263.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - A series of analytical and experimental studies have been conducted at the Paul Scherrer Institut (PSI) to investigate particulate flows inside a model containment consisting of a differentially heated cubical cavity (DHC). Lately, LES simulations were performed using the finite volume ANSYS Fluent CFD code at Rayleigh number 109. After initial confrontation of the predicted fluid field against experimental data, it was concluded that important physical phenomena had not been accounted for in the original pre-test simulations. Namely, radiation and wall conduction in the test section were not negligible and contributed to producing a fluid field that departed in significant ways from that obtained assuming idealized boundary conditions. We show hereafter that the LES predictions with realistic boundary conditions, including radiation and conduction, are in good overall agreement with the experimental mean velocity and temperature fields. In particular, we show that radiation increases turbulence, which in turn increases mixing and reduces the thermal stratification in the cavity. We also find that the velocity rms peaks near the vertical walls are well captured with the realistic boundary conditions (typically within 30%), in contrast to the previous ideal simulations which miss these peaks by a factor 3 to 4

AB - A series of analytical and experimental studies have been conducted at the Paul Scherrer Institut (PSI) to investigate particulate flows inside a model containment consisting of a differentially heated cubical cavity (DHC). Lately, LES simulations were performed using the finite volume ANSYS Fluent CFD code at Rayleigh number 109. After initial confrontation of the predicted fluid field against experimental data, it was concluded that important physical phenomena had not been accounted for in the original pre-test simulations. Namely, radiation and wall conduction in the test section were not negligible and contributed to producing a fluid field that departed in significant ways from that obtained assuming idealized boundary conditions. We show hereafter that the LES predictions with realistic boundary conditions, including radiation and conduction, are in good overall agreement with the experimental mean velocity and temperature fields. In particular, we show that radiation increases turbulence, which in turn increases mixing and reduces the thermal stratification in the cavity. We also find that the velocity rms peaks near the vertical walls are well captured with the realistic boundary conditions (typically within 30%), in contrast to the previous ideal simulations which miss these peaks by a factor 3 to 4

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Dehbi A, Han F, Kalilainen J. Large eddy simulations of flow inside a cubical differentially heated cavity under realistic boundary conditions. In International Congress on Advances in Nuclear Power Plants, ICAPP 2014: Proceedings. Vol. 1. 2014. p. 1963-1970. 14263