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Volume 14, Issue 5
The Investigation of Rayleigh-Taylor Mixing with a Premixed Layer by BHR Turbulence Model

Yang Song, Lili Wang & Pei Wang

Adv. Appl. Math. Mech., 14 (2022), pp. 1017-1039.

Published online: 2022-06

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  • Abstract

The Rayleigh-Taylor mixing with a premixed layer is investigated in the present study. A BHR-II turbulence model is employed to simulate the Rayleigh-Taylor mixing with different premixed layers. The implementation of the BHR-II model is described in detail and validated in canonical problems. Afterwards, the classic Rayleigh-Taylor instability (RTI) with a premixed layer is studied. Effects of density ratio, layer thickness and density profiles on the late time behaviour of classic RTI are analysed, and the results are also compared with ILES data. It turns out that the premixed layer delays the transition time of turbulent mixing. The late time behaviours of different premixed cases show a similar trend with the similarity of their distributions of turbulent kinetic energy. It is also shown that the premixed layer has little effect on the tilted angle in the canonical tilted rig case while the temporal evolution of the turbulent mixing at the early beginning is distinctly influenced by the premixed layer.

  • Keywords

Turbulence model, Rayleigh-Taylor instability, premixed layer.

  • AMS Subject Headings

76F25, 76F55, 76T99

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{AAMM-14-1017, author = {Yang and Song and and 23510 and and Yang Song and Lili and Wang and and 23511 and and Lili Wang and Pei and Wang and and 23512 and and Pei Wang}, title = {The Investigation of Rayleigh-Taylor Mixing with a Premixed Layer by BHR Turbulence Model}, journal = {Advances in Applied Mathematics and Mechanics}, year = {2022}, volume = {14}, number = {5}, pages = {1017--1039}, abstract = {

The Rayleigh-Taylor mixing with a premixed layer is investigated in the present study. A BHR-II turbulence model is employed to simulate the Rayleigh-Taylor mixing with different premixed layers. The implementation of the BHR-II model is described in detail and validated in canonical problems. Afterwards, the classic Rayleigh-Taylor instability (RTI) with a premixed layer is studied. Effects of density ratio, layer thickness and density profiles on the late time behaviour of classic RTI are analysed, and the results are also compared with ILES data. It turns out that the premixed layer delays the transition time of turbulent mixing. The late time behaviours of different premixed cases show a similar trend with the similarity of their distributions of turbulent kinetic energy. It is also shown that the premixed layer has little effect on the tilted angle in the canonical tilted rig case while the temporal evolution of the turbulent mixing at the early beginning is distinctly influenced by the premixed layer.

}, issn = {2075-1354}, doi = {https://doi.org/10.4208/aamm.OA-2021-0032}, url = {http://global-sci.org/intro/article_detail/aamm/20550.html} }
TY - JOUR T1 - The Investigation of Rayleigh-Taylor Mixing with a Premixed Layer by BHR Turbulence Model AU - Song , Yang AU - Wang , Lili AU - Wang , Pei JO - Advances in Applied Mathematics and Mechanics VL - 5 SP - 1017 EP - 1039 PY - 2022 DA - 2022/06 SN - 14 DO - http://doi.org/10.4208/aamm.OA-2021-0032 UR - https://global-sci.org/intro/article_detail/aamm/20550.html KW - Turbulence model, Rayleigh-Taylor instability, premixed layer. AB -

The Rayleigh-Taylor mixing with a premixed layer is investigated in the present study. A BHR-II turbulence model is employed to simulate the Rayleigh-Taylor mixing with different premixed layers. The implementation of the BHR-II model is described in detail and validated in canonical problems. Afterwards, the classic Rayleigh-Taylor instability (RTI) with a premixed layer is studied. Effects of density ratio, layer thickness and density profiles on the late time behaviour of classic RTI are analysed, and the results are also compared with ILES data. It turns out that the premixed layer delays the transition time of turbulent mixing. The late time behaviours of different premixed cases show a similar trend with the similarity of their distributions of turbulent kinetic energy. It is also shown that the premixed layer has little effect on the tilted angle in the canonical tilted rig case while the temporal evolution of the turbulent mixing at the early beginning is distinctly influenced by the premixed layer.

Yang Song, Lili Wang & Pei Wang. (2022). The Investigation of Rayleigh-Taylor Mixing with a Premixed Layer by BHR Turbulence Model. Advances in Applied Mathematics and Mechanics. 14 (5). 1017-1039. doi:10.4208/aamm.OA-2021-0032
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