scholarly journals Flow Analysis in a Cross-Flow Fan by Boundary Element Method and Discrete Vortex Method.

1995 ◽  
Vol 61 (587) ◽  
pp. 2387-2392 ◽  
Author(s):  
Cichang Chen ◽  
Tohru Fukano ◽  
Yoshinori Hara
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Flow Analysis ◽  
Cross Flow ◽  
Vortex Method ◽  
Discrete Vortex ◽  
Discrete Vortex Method ◽  
Cross Flow Fan ◽  
Element Method

scholarly journals Random Vortex Method in Numerical Analysis of 2D Flow Around Circular Cylinder

2015 ◽  
Vol 36 (4) ◽  
pp. 57-63 ◽  
Author(s):  
Stanisław Kostecki
Keyword(s):  
Boundary Element Method ◽  
Circular Cylinder ◽  
Boundary Element ◽  
Oil And Gas ◽  
Mathematical Formulation ◽  
Vortex Method ◽  
Cylinder Surface ◽  
Field Calculation ◽  
Calculated Velocity ◽  
Element Method

Abstract A combination of the vortex method and the boundary element method is used here to predict the two-dimensional flow field around a circular cylinder. Cylindrical structures experience strong hydrodynamic loading, due to vortex detachment from the both sides of cylinder during the flow. Thus, the practical meaning of such calculation is significant particularly in offshore oil and gas engineering as well as in the bridge and hydraulic structure engineering. This paper presents the mathematical formulation of the vortex method for the velocity and vorticity field calculation. The calculated velocity and vorticity fields are then used to predict the pressure distribution on the cylinder surface by the boundary element method. The resulting pressure on the cylinder, the Strouhal number and the length of the base recirculation zone are compared with solutions of other numerical methods and experiments, and a good agreement is achieved.

A Numerical Solution for Potential Flows Including the Effects of Vortex Shedding

1993 ◽  
Vol 115 (2) ◽  
pp. 111-115
Author(s):  
L. H. Wong ◽  
S. M. Calisal
Keyword(s):  
Flat Plate ◽  
Boundary Element ◽  
Vortex Shedding ◽  
Potential Flow ◽  
Vortex Method ◽  
Vortex Sheet ◽  
Oscillating Flow ◽  
Discrete Vortex ◽  
Discrete Vortex Method ◽  
Inner Region

This paper reports on an attempt to include vortex shedding effects into potential flow calculations using the boundary element method. Significant computational advantages result because of the relatively simple approach to handling separation at the sharp edges while working only with the boundary values. A discrete vortex method was incorporated into a time domain boundary element algorithm for the numerical simulation of oscillating flow past a normal flat plate. Separation from a sharp edge results in the formation of a vortex sheet issuing from the edge. This vortex sheet is modeled by a series of discrete vortices introduced one at a time into the flow field at regular intervals. The motion of each vortex is traced over time using its convection velocity. As long as the Keulegan-Carpenter number is small enough, vortex shedding takes place close to the edge. The discrete vortex method can, in such cases, be looked upon as the inner region solution to the problem of normal oscillating flow past the flat plate. This inner region solution has to be matched with the outer potential flow solution. The combination of boundary element and discrete vortex methods provides this matching and at the same time does not require calculations inside the domain.

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