Grid-free Monte Carlo for PDEs with spatially varying coefficients
Grid-free Monte Carlo for PDEs with spatially varying coefficients
复制标题
用于具有空间变化系数的偏微分方程的无网格蒙特卡罗
DOI:
10.1145/3528223.3530134
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发表时间:
2022
影响因子:
6.2
通讯作者:
Crane, Keenan
中科院分区:
文献类型:
--
作者:
Sawhney, Rohan;Seyb, Dario;Jarosz, Wojciech;Crane, Keenan
Partial differential equations (PDEs) with spatially varying coefficients arise throughout science and engineering, modeling rich heterogeneous material behavior. Yet conventional PDE solvers struggle with the immense complexity found in nature, since they must first discretize the problem---leading to spatial aliasing, and global meshing/sampling that is costly and error-prone. We describe a method that approximates neither the domain geometry, the problem data, nor the solution space, providing the exact solution (in expectation) even for problems with extremely detailed geometry and intricate coefficients. Our main contribution is to extend thewalk on spheres (WoS)algorithm from constant- to variable-coefficient problems, by drawing on techniques from volumetric rendering. In particular, an approach inspired bynull-scatteringyields unbiased Monte Carlo estimators for a large class of 2nd order elliptic PDEs, which share many attractive features with Monte Carlo rendering: no meshing, trivial parallelism, and the ability to evaluate the solution at any point without solving a global system of equations.
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影响因子:
4.1
作者:
M. Mascagni;N. Simonov
通讯作者:
M. Mascagni;N. Simonov
影响因子:
1.2
作者:
S. N. Cramer
通讯作者:
S. N. Cramer
影响因子:
6.2
作者:
Rohan Sawhney;Keenan Crane
通讯作者:
Keenan Crane
影响因子:
4.1
作者:
Bayona, Victor;Flyer, Natasha;Fornberg, Bengt
通讯作者:
Fornberg, Bengt
DOI:
10.1145/218013.218096
发表时间:
1995
期刊:
Proceedings of the third ACM symposium on Solid modeling and applications
影响因子:
--
作者:
J. Zagajac
通讯作者:
J. Zagajac