First-passage time statistics on surfaces of general shape: Surface PDE solvers using Generalized Moving Least Squares (GMLS)
Journal Article
·
· Journal of Computational Physics
- Univ. of California, Santa Barbara, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Here, we develop numerical methods for computing statistics of stochastic processes on surfaces of general shape with drift-diffusion dynamics dXt = a(Xt)dt + b(Xt )dWt . We formulate descriptions of Brownian motion and general drift-diffusion processes on surfaces. We consider statistics of the form u(x) = Ex [$$∫^{τ}_{0}$$ g(Xt)dt] + Ex [f (Xτ)] for a domain Ω and the exit stopping time τ = inft {t>0 | XiΩ}, where f , g are general smooth functions. For computing these statistics, we develop high-order Generalized Moving Least Squares (GMLS) solvers for associated surface PDE boundary-value problems based on Backward- Kolmogorov equations. We focus particularly on the mean First Passage Times (FPTs) given by the case f = 0, g = 1 where u(x) = Ex [τ]. We perform studies for a variety of shapes showing our methods converge with high-order accuracy both in capturing the geometry and the surface PDE solutions. We then perform studies showing how statistics are influenced by the surface geometry, drift dynamics, and spatially dependent diffusivities.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Grant/Contract Number:
- NA0003525; SC0019246
- OSTI ID:
- 1882875
- Alternate ID(s):
- OSTI ID: 2331464
- Report Number(s):
- SAND--2022-0041J; 702770
- Journal Information:
- Journal of Computational Physics, Journal Name: Journal of Computational Physics Vol. 453; ISSN 0021-9991
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
97 MATHEMATICS AND COMPUTING
First passage time statistics
Generalized Moving Least Squares (GMLS)
Meshless methods
Path-dependent statistics
Stochastic processes on surfaces
Surface PDEs
differential geometry
first passage times
scientific computation
statistical mechanics
stochastic processes
GENERAL PHYSICS
97 MATHEMATICS AND COMPUTING
First passage time statistics
Generalized Moving Least Squares (GMLS)
Meshless methods
Path-dependent statistics
Stochastic processes on surfaces
Surface PDEs
differential geometry
first passage times
scientific computation
statistical mechanics
stochastic processes