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边界单元法是70年代末期发展起来的一种数值方法.应用于均质承压含水层非稳定流计算的边界单元法的公式推导,目前有二种途径,一为直接格林函数法.另一种为拉氏法.Liggett等人于1979年提出了拉氏法,并用一物理算例进行了验证.指出了该方法的计算精度及优越性,并指出变换参数的个数一般为8—10个较好.本文在文献[1]的基础上,推导了该方法的计算公式.并以同样算例在南京大学计算中心ES-1022机上进行了实践,实践中发现,该方法除了具备一般边界单元法所具有的优越性外,同非稳定流直接格林函数法的边界单元法相比,其最大优点是节省上机的计算时间,
The boundary element method is a numerical method developed in the late 1970s, and there are two ways to derive the formula for the boundary element method of unsteady flow calculation of a homogeneous confined aquifer: one is the direct Green’s function method, the other Liggett et al. Proposed the Laplace method in 1979 and verified it with a physical example, pointing out the computational accuracy and superiority of the method and pointing out that the number of transform parameters is generally 8-10 This article is based on the literature [1], derived the calculation formula of this method.And with the same example in Nanjing University Computing Center ES-1022 machine practice, found that this method in addition to the general boundaries Compared with the boundary element method of direct Green’s function method with unsteady flow, the biggest advantage of the element method is that it saves the calculation time of the computer,