کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4740060 1641143 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An optimal 5-point scheme for frequency-domain scalar wave equation
ترجمه فارسی عنوان
یک طرح 5 نقطه ای مناسب برای معادله موج اسکنر فرکانس-دامنه
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی


• A new 5-point scheme is proposed for 2D frequency-domain scalar wave equation.
• Optimal finite-difference coefficients are obtained by conjugate gradient method.
• The new scheme provides much greater accuracy than the classic one.

The classic 5-point scheme has been commonly applied in frequency-domain finite-difference (FD) modeling and full waveform inversion of 2D scalar wave equation. This scheme takes less computational costs but provides pretty lower accuracy than other more-point schemes. To improve the accuracy without increasing computational costs of this scheme, I develop a new 5-point scheme. Taylor-series expansion (TE) and conjugate gradient (CG) methods are adopted to calculate FD coefficients respectively. Dispersion analysis shows that the new scheme provides significantly greater accuracy than the classic one, and the CG-based new scheme generally has higher precision than the TE-based new one. Numerical experiments demonstrate the advantage of the proposed scheme.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Applied Geophysics - Volume 108, September 2014, Pages 19–24
نویسندگان
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