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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40074

Title: Numerical Analysis of Flow Past a Square Cylinder using Least-Squares Finite-Element Method
Authors: Shin-Jye Liang
Contributors: 國立臺灣海洋大學:海洋環境資訊學系
Date: 2005-12
Issue Date: 2017-01-13T06:09:30Z
Publisher: Proceedings of the 27th Ocean Engineering Conference
Abstract: ABSTRACT: A wieghted Least-Squares Finite-Element Method (LSFEM) based on the velocity-vorticitypressure (VVP) first-order formulation for the Navier-Stokes equations was developed. Several types of elements (interpolation functions), including equal-order 3-node and 6-node triangle elements, as well as 4-node, 8-node and 9-node quadrilateral elements were employed. We used the flow past a circular cylinder at Re = 20 and 40 (steady cases), as well as the vortex shedding behind the square cylinder at Re = 100 and 200 (unsteady case) as the model problem to verify the model. Computed results showed that approximations highly depended on the choice of element types and the number of Gaussian points used in the numerical quadrature. It was found that using 3-node triangle elements resulted in an over-determined system of equations and underestimated approximations, and therefore, failed to produce the self-sustained vortex shedding; While using other types of elements with an appropriate number of Gaussian quadrature points resulted in reasonable predictions compared with the results of other research.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40074
Appears in Collections:[海洋環境資訊系] 演講及研討會

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