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VGU RESEARCH REPOSITORY


Please use this identifier to cite or link to this item: https://epub.vgu.edu.vn/handle/dlibvgu/1640
Title: Numerical study of wall effects of a viscoplastic fluid over a stationary cylinder
Authors: Nguyen Thi Mai Linh 
Keywords: Herschel-Bulkley (HB) fluid;Cylinder
Issue Date: 2022
Abstract: 
This thesis investigates the effects of the boundary layer developed on the bottom wall on the flow characteristics. The boundary layer is the region attached to the wall up to where the velocity is roughly 99 percent of the free stream velocity. Its thickness is computed by both theoretical analysis and simulations. As the results by theoretical analysis are found not appropriate as the Reynolds number is too small, we rely on the results obtained from the simulations. When 𝐺 = 0.5𝐷, the cylinder is completely inside the boundary
layer. In contrast, when 𝐺 = 4.5𝐷 and 9.5𝐷, the cylinder is entirely outside it. Results are presented and analysed for numerous flow characteristics, such as streamline patterns, vorticity contours, unyielded (solid-like) zones, and hydrodynamic force coefficients.
URI(1): https://epub.vgu.edu.vn/handle/dlibvgu/1640
Rights: Attribution-NonCommercial 4.0 International
Appears in Collections:Computational Engineering (CompEng)

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