singular surface

The surface Helmholtz integral equation dispersed by quadratic iso_parametric element is used as computation equation. Extensive work has been performed to overcome boundary integral equation in acoustic problems, non_uniqueness of solution and singular integral kernels.

以二次等参元离散的表面Helmholtz积分方程作为计算方程，采用一系列数值处理技术，克服了表面Helmholtz积分方程求解声学问题时出现的解的不唯一性和积分函数奇异性。

Transient Evolution of Non-singular Saffman-Taylor Fing with Small Surface Tension

小表面张力下非奇性Saffman-Taylor指的短时演化

If the crack is far from the free surface, the equations reduce to hyper-singular integral equations in infinite elastic solids.

如果裂纹离自由面的距离很远，该方程组便可退化为无限空间弹性体中三维平片裂纹的超奇异积分方程组。