A new method for Stokes problems with circular boundaries using degenerate kernel and Fourier series |
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| Authors: | Jeng‐Tzong Chen Chia‐Chun Hsiao Shyue‐Yuh Leu |
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| Affiliation: | 1. Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung, Taiwan;2. Department of Aviation Mechanical Engineering, China Institute of Technology, Taipei, Taiwan |
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| Abstract: | This study is concerned with the Stokes flow of an incompressible fluid of constant density and viscosity with circular boundaries. To fully capture the circular boundary, the boundary densities in the direct and indirect boundary integral equations (BIEs) are expanded in terms of Fourier series. The kernel functions in either the direct BIE or the indirect BIE are expanded to degenerate kernels by using the separation of field and source points. Consequently, the improper integrals are transformed to series sum and are easily calculated. The linear algebraic system can be established by matching the boundary conditions at the collocation points. Then, the unknown Fourier coefficients can be easily determined. Finally, several examples including circular and eccentric domains are presented to demonstrate the validity of the present method. Five gains were obtained: (1) meshless approach; (2) free of boundary‐layer effect; (3) singularity free; (4) exponential convergence; and (5) well‐posed model. Copyright © 2007 John Wiley & Sons, Ltd. |
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| Keywords: | biharmonic equation boundary integral equation null‐field integral equation degenerate kernel Fourier series Stokes flow |
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