کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5427599 1508637 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Controlled time integration for the numerical simulation of meteor radar reflections
ترجمه فارسی عنوان
ادغام زمان کنترل شده برای شبیه سازی عددی بازتاب های رادار شهاب سنگ
کلمات کلیدی
پراکندگی الکترومغناطیسی، شهاب سنگها، بازتاب رادار اشیاء پلاستیک محاسبات بیرونی گسسته، معادله انتگرال دوره،
موضوعات مرتبط
مهندسی و علوم پایه شیمی طیف سنجی
چکیده انگلیسی


- Three-dimensional meteor plasma dynamics is considered by numerical simulations.
- Discrete exterior calculus improves the efficiency of explicit time-stepping.
- Controlled time integration accelerates the convergence to time-harmonic solution.

We model meteoroids entering the Earth׳s atmosphere as objects surrounded by non-magnetized plasma, and consider efficient numerical simulation of radar reflections from meteors in the time domain. Instead of the widely used finite difference time domain method (FDTD), we use more generalized finite differences by applying the discrete exterior calculus (DEC) and non-uniform leapfrog-style time discretization. The computational domain is presented by convex polyhedral elements. The convergence of the time integration is accelerated by the exact controllability method. The numerical experiments show that our code is efficiently parallelized. The DEC approach is compared to the volume integral equation (VIE) method by numerical experiments. The result is that both methods are competitive in modelling non-magnetized plasma scattering. For demonstrating the simulation capabilities of the DEC approach, we present numerical experiments of radar reflections and vary parameters in a wide range.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 178, July 2016, Pages 295-305
نویسندگان
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