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A second-order numerical method for elliptic equations with singular sources using local flter
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作者 Jiang Yongsong Fang Le +2 位作者 Jing Xiaodong Sun Xiaofeng Francis Leboeuf 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2013年第6期1398-1408,共11页
The presence of Dirac delta function in differential equation can lead to a discontinuity,which may degrade the accuracy of related numerical methods.To improve the accuracy,a secondorder numerical method for elliptic... The presence of Dirac delta function in differential equation can lead to a discontinuity,which may degrade the accuracy of related numerical methods.To improve the accuracy,a secondorder numerical method for elliptic equations with singular sources is introduced by employing a local kernel flter.In this method,the discontinuous equation is convoluted with the kernel function to obtain a more regular one.Then the original equation is replaced by this fltered equation around the singular points,to obtain discrete numerical form.The unchanged equations at the other points are discretized by using a central difference scheme.1D and 2D examples are carried out to validate the correctness and accuracy of the present method.The results show that a second-order of accuracy can be obtained in the fltering framework with an appropriate integration rule.Furthermore,the present method does not need any jump condition,and also has extremely simple form that can be easily extended to high dimensional cases and complex geometry. 展开更多
关键词 Computational aerodynamics Immersed boundary method Immersed interface method kernel flter Singular source
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