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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Effects of buoyancy on the turbulence of spatially developing buoyant jet

pages 447-450
DOI: 10.1615/THMT-18.440
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RESUMO

We investigated the effects of buoyancy on a spatially developing buoyant jet through direct numerical simulations at Re = 1740. The spectral tendency showed a rapid decay of the buoyant scalar fluctuation at high frequency, the slope of which is -3. The TKE budget revealed that the buoyancy plays a role in the production of turbulence. We calculated the term of the subgrid-scale energy transport equation, which comes from the buoyancy effect, using an explicit box filtering operation. The term took the same sign as the term of the subgrid-scale energy transfer; however, with an increase in the filter size, the term from the buoyancy decreased more drastically than that of the subgrid-scale energy transfer. This tendency was also true in the local coordinate of the turbulent/non-turbulent interface.

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