Simulation of Turbulent Convection at High Rayleigh Numbers
The paper considers the possibility of using different approaches to modeling turbulence under conditions of highly developed convection at high Rayleigh numbers. A number of industrially oriented problems with experimental data have been chosen for the study. It is shown that, at Rayleigh numbers f...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Modelling and Simulation in Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/5781602 |
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| _version_ | 1832565464619810816 |
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| author | Sergey Dmitriev Andrey Kozelkov Andrey Kurkin Nataliya Tarasova Valentin Efremov Vadim Kurulin Roman Shamin Maksim Legchanov |
| author_facet | Sergey Dmitriev Andrey Kozelkov Andrey Kurkin Nataliya Tarasova Valentin Efremov Vadim Kurulin Roman Shamin Maksim Legchanov |
| author_sort | Sergey Dmitriev |
| collection | DOAJ |
| description | The paper considers the possibility of using different approaches to modeling turbulence under conditions of highly developed convection at high Rayleigh numbers. A number of industrially oriented problems with experimental data have been chosen for the study. It is shown that, at Rayleigh numbers from 109 to 1017, the application of the eddy-resolving LES model makes it possible to substantially increase the accuracy of modeling natural convection in comparison with the linear vortex viscosity model SST. This advantage is most pronounced for cases of a vertical temperature difference with the formation of a large zone of convection of strong intensity. The use of the Reynolds stress model EARSM is shown for cases of natural convective flow in domains with dihedral angles in the simulated region and the predominance of secondary currents. When simulating a less intense convective flow, when the temperature difference is reached at one boundary, the differences in the approaches used to model turbulence are less significant. It is shown that, with increasing values of Rayleigh numbers, errors in the determination of thermohydraulic characteristics increase and, for more accurate determination of them, it is expedient to use eddy-resolving approaches to the modeling of turbulence. |
| format | Article |
| id | doaj-art-a3ea5903ab5e4c94a5637d095bc9e4c7 |
| institution | Kabale University |
| issn | 1687-5591 1687-5605 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Modelling and Simulation in Engineering |
| spelling | doaj-art-a3ea5903ab5e4c94a5637d095bc9e4c72025-02-03T01:07:46ZengWileyModelling and Simulation in Engineering1687-55911687-56052018-01-01201810.1155/2018/57816025781602Simulation of Turbulent Convection at High Rayleigh NumbersSergey Dmitriev0Andrey Kozelkov1Andrey Kurkin2Nataliya Tarasova3Valentin Efremov4Vadim Kurulin5Roman Shamin6Maksim Legchanov7Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, RussiaNizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, RussiaNizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, RussiaRussian Federal Nuclear Center-All-Russia Institute of Experimental Physics, Sarov, RussiaShipunov Instrument Design Bureau, Tula 300001, RussiaRussian Federal Nuclear Center-All-Russia Institute of Experimental Physics, Sarov, RussiaInstitute of Space Technologies, Peoples’ Friendship University of Russia (RUDN University), Moscow, RussiaNizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, RussiaThe paper considers the possibility of using different approaches to modeling turbulence under conditions of highly developed convection at high Rayleigh numbers. A number of industrially oriented problems with experimental data have been chosen for the study. It is shown that, at Rayleigh numbers from 109 to 1017, the application of the eddy-resolving LES model makes it possible to substantially increase the accuracy of modeling natural convection in comparison with the linear vortex viscosity model SST. This advantage is most pronounced for cases of a vertical temperature difference with the formation of a large zone of convection of strong intensity. The use of the Reynolds stress model EARSM is shown for cases of natural convective flow in domains with dihedral angles in the simulated region and the predominance of secondary currents. When simulating a less intense convective flow, when the temperature difference is reached at one boundary, the differences in the approaches used to model turbulence are less significant. It is shown that, with increasing values of Rayleigh numbers, errors in the determination of thermohydraulic characteristics increase and, for more accurate determination of them, it is expedient to use eddy-resolving approaches to the modeling of turbulence.http://dx.doi.org/10.1155/2018/5781602 |
| spellingShingle | Sergey Dmitriev Andrey Kozelkov Andrey Kurkin Nataliya Tarasova Valentin Efremov Vadim Kurulin Roman Shamin Maksim Legchanov Simulation of Turbulent Convection at High Rayleigh Numbers Modelling and Simulation in Engineering |
| title | Simulation of Turbulent Convection at High Rayleigh Numbers |
| title_full | Simulation of Turbulent Convection at High Rayleigh Numbers |
| title_fullStr | Simulation of Turbulent Convection at High Rayleigh Numbers |
| title_full_unstemmed | Simulation of Turbulent Convection at High Rayleigh Numbers |
| title_short | Simulation of Turbulent Convection at High Rayleigh Numbers |
| title_sort | simulation of turbulent convection at high rayleigh numbers |
| url | http://dx.doi.org/10.1155/2018/5781602 |
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