کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
507279 865111 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elastic lattice modelling of seismic waves including a free surface
ترجمه فارسی عنوان
مدل سازی شبکه ی الاستیک از امواج لرزه ای از جمله یک سطح آزاد
کلمات کلیدی
روش شبکه الاستیسیته، روش ذرات گسسته، توزیع موج لرزه ای محاسباتی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
چکیده انگلیسی

Elastic lattice methods (ELMs) have been shown to accurately model seismic wave propagation in a heterogeneous medium. These methods represent an elastic solid as a series of interconnected springs arranged on a lattice and recover a continuum wave equation in the long wavelength limit. However, in the case of a regular lattice, the recovery of the continuum equation depends on the symmetry of the lattice. By removing particles above a free surface this symmetry is broken. Therefore, this free surface implementation leads to errors when compared with a traction free boundary condition. The error between a traction free boundary condition and the ELMs grows as the Poisson׳s ratio deviates from 0.25. By modifying the interaction constants with a scalar, the error can be reduced while keeping the flexibility of the nearest neighbour interaction rule. We present results of simulations where modified spring constants reduce the misfit with a traction free boundary solution and hence increase the accuracy of the elastic lattice method solution on the free surface.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Geosciences - Volume 67, June 2014, Pages 117–124
نویسندگان
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