Academic Thesis

Basic information

Name Iwano Kouji
Belonging department
Occupation name
researchmap researcher code 7000016503
researchmap agency Okayama University of Science

Title

Effect of the large-scale structure on turbulent Prandtl number in a turbulent shear layer

Bibliography Type

Author

Kotaro Takamure, Yasuhiko Sakai, Yasumasa Ito, Koji Iwano

Summary

We have run a Direct Numerical Simulation of a spatially developing shear mixing layer. The aim of this study is to clarify the influence of the large-scale structure on the turbulent Prandtl number PrT. As a main conclusion, PrT takes a small value (PrT ∼ 0.5) in the dominant region of the large-scale structure. The budget analyses for the Reynolds stress equation and the scalar flux equation revealed that the differences between the momentum and scalar transfer are caused by terms related to pressure (i.e., pressure-strain correlation term, pressure-scalar gradient correlation term, and pressure diffusion terms). Phenomenally, the momentum in the field where a large-scale vortex coexists tends to be transported toward the counter-gradient direction under the influence of pressure, but the scalar is transported toward the gradient direction. As a result, it is thought that the difference in the driving force between the momentum and scalar transport causes the decrease of the PrT.

Magazine(name)

ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids

Publisher

Volume

1

Number Of Pages

StartingPage

V001T01A060

EndingPage

V001T01A060

Date of Issue

2019/01

Referee

Not exist

Invited

Not exist

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