Seismic wave numerical simulation method
A numerical simulation and seismic wave technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of suppressing false waves, large step size, and low calculation cost
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[0033]The specific implementation manners of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0034] In this embodiment, the model calculation area is a triangular area. Define the grid density function according to the velocity distribution of the model and the spatial sampling requirements of the seismic wave finite element method Among them, v s is the shear wave velocity, f max is the maximum frequency of the wavelet used in the simulation, and N represents the number of sampling points required within a shortest shear wave wavelength. When the second-order space is used, N takes 1.9, and when the third-order space is used, N takes 0.9.
[0035] Apply the basic principle of the discontinuous Galerkin finite element method to deduce the integral equation (finite element equation) corresponding to the first-order velocity-stress equation of the elastic wave, and realize the decoupling of adjacent grid ce...
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