ASP Online Seminars: Turbulence and free surface of a flow over a rotating disk

by Dr Mbolahasina RALIJAONA (University of Antananarivo, Madagascar)

Tuesday 23 Mar 2021, 13:30 → 15:00 GMT

Abstract:

This work concerns the numerical simulation of a flow over a rotating disk. The flow is driven by the rotation of the bottom of a cylindrical container, filled with fluid, which side wall is fixed. Turbulence was modelled with RANS k- ω equations and the free surface was determined with the level set method. Finite element method was the numerical method used. The flow is structured in four parts : the fluid is centrifugal near the bottom, upward near the sidewall, toward the center in the upper part, and downward at the center. Close to the free surface, the velocity fluctuations are high and of high characteristic time. Polygons varying with time are observed at the free surface. The Reynolds number does not influence the temporal variation of polygons. The most types of polygons are observed when the initial height of the fluid is equal to the cylinder radius. Temporal variations of polygons show a strong memory effect when the Reynolds number is equal to 100,000.

ASP_20210323_MbolahasinaRALIJAONA _CFD.mp4

ASPseminarMbolahasina.pdf

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