کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
521809 867788 2012 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Self-gravitational force calculation of infinitesimally thin gaseous disks
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Self-gravitational force calculation of infinitesimally thin gaseous disks
چکیده انگلیسی

A thin gaseous disk has often been investigated in the context of various phenomena in galaxies, which point to the existence of starburst rings and dense circumnuclear molecular disks. The effect of self-gravity of the gas in the 2D2D disk can be important in confronting observations and numerical simulations in detail. For use in such applications, a new method for the calculation of the gravitational force of a 2D2D disk is presented. Instead of solving the complete potential function problem, we calculate the force in infinite planes in Cartesian and polar coordinates by a reproducing kernel method. Under the limitation of a 2D2D disk, we specifically represent the force as a double summation of a convolution of the surface density and a fundamental kernel and employ a fast Fourier transform technique. In this method, the entire computational complexity can be reduced from O(N2×N2)O(N2×N2) to O(N2(log2N)2)O(N2(log2N)2), where N is the number of zones in one dimension. This approach does not require softening. The proposed method is similar to a spectral method, but without the necessity of imposing a periodic boundary condition. We further show this approach is of near second order accuracy for a smooth surface density in a Cartesian coordinate system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 231, Issue 24, 15 October 2012, Pages 8246–8261
نویسندگان
, , , ,