Frequency domain finite element total absorption PML method applicable to TTI medium
A finite element, full absorption technology, applied in the field of geophysical exploration, which can solve the problems of insufficient accuracy, increased calculation amount, numerical instability, etc.
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[0093] Consider a TTI acoustic logging model whose sound source is a monopole sound source with a center frequency of 3 kHz. The formation outside the well is obtained by rotating a VTI formation by 45°, and its generalized Hooke matrix is In this problem, the absorbing boundary layer occupies only 8 mesh thicknesses, which is much smaller than the wavelength, which is a very big challenge to the numerical simulation method.
[0094] figure 1 From left to right are the wave field diagrams of the absorption boundary of M-PML, C-PML and the fully absorbing PML of the present invention. It can be seen in the figure that for this model, under the absorption boundary of M-PML and C-PML, there are very obvious boundary reflections and instability along with the propagation of the wave field. Fully absorb the PML boundary conditions, with better absorption effect and better stability.
[0095] Next, we will investigate the comparison of the absorption effect when the value of m i...
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