The result shows that the penetration of diffraction wave rays through the low velocity zone in subsided column results in an obvious time delay, with the water filled subsided column being longer in delayed time than that of the non water filled subsided column.

The portable mine detector,which is used to make advance detection of the front small structure of the mining faces by utilizing the diffracted wave,has become an effective auxiliary tool for the forecasting in the tunnelling.

Two numerical examples illustrated the theoretical results, and the ellipse features of non-zero offset Fresnel zone expounded the distribution of the main energy of seismic diffracted waves quantitatively.

A numerical model of wave diffraction was established using infinite similar element method(ISEM),coupled with finite element method(Garlerkin),to obtain wave force on a vertical cylinder of arbitrary cross section.

An analytical method was developed to study the wave diffraction effects on V-type bottom-mounted breakwaters.

Based on the image theory, the wave diffraction from a cylinder in front of a vertical wall is transformed into the problem of diffraction of bidirectional incident waves from two cylinders.

In this paper, based on the simplified two-fluid model under the assumption of dilute gas-particle suspensions, the complex two-phase flow induced by shock diffraction from an open axisymmetrical tube in a dusty gas has been investigated by using high accuracy and high resolution schemes.

In order to study the characteristics of shock diffraction around a sharp 90 degree corner in the dusty gas,we adopt the operator-splitting technique and high-resolution numerical method, reveal the changes of diffraction pattern due to particle and discuss the effects of particle properties on post-shock flow field.