Title: Investigation of wall pressures and surface flow patterns on a wall-mounted square cylinder using very high-resolution Cartesian mesh
Abstract: Surface flow patterns on a wall-mounted square cylinder and their relationship with pressure are investigated numerically using a fine Cartesian grid. A combination of the building cube and immersed boundary methods and results, including mean pressure, root mean square (r.m.s) pressure, and flow fields are validated qualitatively and quantitatively through experiments. At an attack angle (α) of 0°, it is found that the mean pressure has a distinct vertical classification, even for short cylinders (aspect ratio of 3 or 4). The side-wall pressures are divided into three categories from bottom to top: “junction region,” “2D-like region,” and “free-end region.” Their borders correspond to two notable saddle points in the side-wall streamlines. The mean base pressures can be classified into “lower region” and “near-wake vortex influence region” in the vertical direction. The base-pressure tendency is similar to the change in wake formation lengths. The border is near the upper end of the attachment line in back-wall streamlines. At α = 15°, the mean pressures on the flow-reattachment wall are classified using the curvature of the attachment line, wherein strong two-dimensional effects arise locally in the 2D-like region. Additionally, the similarity between 2D-like regions and infinite cylinders is discussed.
Publication Year: 2019
Publication Date: 2019-03-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 43
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