Boundary element calculation is applied to the main flow field, while integral methods of the boundary layer theory are applied to the viscous layers.

According to the fractal geometry theory and the non-compressed viscous fluid laminar flow theory, the leakage model of metallic gasket based on fractal parameter was established.

This paper describes a numerical method to predict the hydrodynamic characteristics of 2-d wave-making hydrofoil in the steady viscous fluid flow by the boundary layer theory.