Study of the turbulence collapse in an open channel stratified

Authors

DOI:

https://doi.org/10.5902/2179460X45312

Keywords:

Boundary Layer, CFD, Turbulence

Abstract

Shortly after sunset the surface starts its cooling by the emission of longwave radiation. As a result of this process, the air layers along with the surface are cooled, thus giving rise to a Stable Boundary Layer (SBL). This paper aims to perform a numerical simulation of a turbulent flow and observe the effects of stratification on it. To perform this study, a reproduction of a flow in an open channel was made due the fact that the upper wall did not influence the flow, in which a temperature gradient between the lower and upper plates was applied. The CFD software used in this paper was OpenFOAM 2.4.0. The most appropriate solver for the present study is the buoyantPimpleFoam, which is suitable for compressible, turbulent, transient and heat transfer flows. Analyzing the results, it can be observed that before the thermal stratification process was performed the levels are coupled as a function of the turbulence. When this occurs, it causes greater velocity and temperature homogenization in the central region of the domain. For larger temperature gradients, it can be observed a laminarization of the flow due the thermal forcing being bigger than the mechanical ones.

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Author Biographies

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

Graduando em Engenharia Mecânica pela Universidade Federal do Pampa

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

Graduando em Engenharia Mecânica pela Universidade Federal do Pampa

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

Possui graduação em Engenharia Mecânica pela Universidade Federal do Pampa

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

Possui graduação em Engenharia Mecânica pela Universidade Federal do Pampa

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

Possui graduação em Física Licenciatura Pela pela Universidade Federal de Santa Maria, mestrado em Física pela Universidade Federal de Santa Maria, e doutorado em Física pela Universidade Federal de Santa Maria

References

HOLMAN, J. Heat Transfer of International Edition. [S.l.]: McGraw-Hill, New York, 2009.

HOLZMANN, T. Mathematics, Numerics, Derivations and OpenFOAM®. [S.l.]: Loeben, Germany:Holzmann CFD, 2016. Disponível em: https://holzmann-cfd. Acesso em: 29 nov. 2017

MAHRT, L.; VICKERS, D. Extremely weak mixing in stable conditions. Boundary-layer meteorology, Springer, v. 119, n. 1, p. 19–39, 2006.

PENTTINEN, O.; YASARI, E.; NILSSON, H. A pimplefoam tutorial for channel flow, with respect to different les models. Practice Periodical on Structural Design and Construction, v. 23, n. 2, p.1–23, 2011.

STULL, R. B. An introduction to boundary layer meteorology. [S.l.]: Springer, 1988. v. 13.

Published

2020-08-28

How to Cite

Kirinus, C. H., Lamaizon, F. P., Camponogara, L. F., Lemes Junior, D. N., & Costa, F. D. (2020). Study of the turbulence collapse in an open channel stratified. Ciência E Natura, 42, e6. https://doi.org/10.5902/2179460X45312

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