Abstract
AbstractIn numerical modeling elastic wave equations, an artificial boundary must be given around the area in which the wave propagation is interesting. Unlike the wave filed within the area, the wave filed on the boundary cannot be calculated using the center difference method, thus the numerical calculation precision is decreased greatly, and as a result reflection is generated. For avoiding the reflection generating on the boundary, the delay boundary conditions method is proposed by this paper. On the basis of the fact that there are the same phase‐delay and the same coefficient of amplitude attenuation on equidistant particles in the direction of wave propagation, the phase‐delay and the coefficient of amplitude attenuation on the boundary can be calculated using the wave field within the boundary. Thus the precision of the wave field calculation on the boundary is improved and the reflection is removed.
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