Analysis of the turbulence collapse in a closed channel with surface transient temperature conditions

Authors

DOI:

https://doi.org/10.5902/2179460X55229

Keywords:

CFD, Intermittency, LES, Turbulence

Abstract

NumericalFlow at the nocturnal atmospheric boundary layer, during the very stable flow regime (VSBL), is complex due to the almost complete suppression of the flow turbulence and its resurgence in the form of intermittent bursts of turbulence. The occurrence of intermittent flow in the stable boundary layer (SBL) may be associated with external flow phenomena such as low-level jets and wave phenomena. However, recent work suggests that intermittency may be a natural mode of VSBL, regimen when the flow is laminarizing. Thus, the present work aims to simulate a situation of the continuous increase of the stratification of the flow by continuously reducing the surface temperature of the flow in a closed channel. Numerical simulations were performed using large eddy simulation (LES), with a free software of computational fluid dynamics OpenFOAM. The results indicate that as the temperature gradient increases between the surface and the top of the vertical domain, the boundary layer turbulence near the surface is reduced and a jet is generated in the flow. In addition, as surface temperature decreases, intermittent events arise in the runoff.

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Author Biographies

Luis Fernando Camponogara, Universidade Federal do Pampa, Campus Alegrete, RS

Possui graduação em Engenharia Mecânica pela Universidade Federal do Pampa (2018), atualmente é mestrando em Engenharias pela Universidade Federal do Pampa.

Cristhian Hilberto Kirinus, Universidade Federal do Pampa, Campus Alegrete, RS

Graduando em Engenharia Mecânica pela Universidade Federal do Pampa.

Danilo Nogueira Lemes Junior, Universidade Federal do Pampa, Campus Alegrete, RS

Possui graduação em Engenharia Mecânica pela Universidade Federal do Pampa (2017) e atualmente é aluno do Programa de Pós Graduação em Engenharia (PPEng) da Universidade Federal do Pampa (UNIPAMPA).

Felipe Pereira Lamaizon, Universidade Federal do Pampa, Campus Alegrete, RS

Graduando em Engenharia Mecânica pela Universidade Federal do Pampa.

Maicon Fonseca Andrades, Universidade Federal do Pampa, Campus Alegrete, RS

Aluno do Programa de Pós Graduação em Engenharia da Universidade Federal do Pampa. Bacharel em engenharia mecânica pela mesma instituição.

Felipe Denardin Costa, Universidade Federal do Pampa, Campus Alegrete, RS

Possui graduação em Física Licenciatura Pela pela Universidade Federal de Santa Maria (2007), mestrado em Física pela Universidade Federal de Santa Maria (2009), e doutorado em Física pela Universidade Federal de Santa Maria (2011).

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How to Cite

Camponogara, L. F., Kirinus, C. H., Lemes Junior, D. N., Lamaizon, F. P., Andrades, M. F., & Costa, F. D. (2020). Analysis of the turbulence collapse in a closed channel with surface transient temperature conditions. Ciência E Natura, 42, e41. https://doi.org/10.5902/2179460X55229

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