First-passage time statistics on surfaces of general shape: Surface PDE solvers using Generalized Moving Least Squares (GMLS)
- Univ. of California, Santa Barbara, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
We develop numerical methods for computing statistics of stochastic processes on surfaces of general shape with drift-diffusion dynamics $$d\mb{X}_t = a(\mb{X}_t)dt + \mb{b}(\mb{X}_t)d\mb{W}_t$$. We consider on a surface domain $$\Omega$$ the statistics $$u(\mb{x}) = \mathbb{E}^{\mb{x}}\left[\int_0^\tau g(X_t)dt \right] + \mathbb{E}^{\mb{x}}\left[f(X_\tau)\right]$$ with the exit stopping time $$\tau = \inf_t \{t > 0 \; |\; X_t \not\in \Omega\}$$. Using Dynkin's formula, we compute statistics by developing high-order Generalized Moving Least Squares (GMLS) solvers for the associated surface PDE boundary-value problems. We focus particularly on the mean First Passage Times (FPTs) given by the special case $$f = 0,\, g = 1$$ with $$u(\mb{x}) = \mathbb{E}^{\mb{x}}\left[\tau\right]$$. 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 FPTs are influenced by the surface geometry, drift dynamics, and spatially dependent diffusivities.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Grant/Contract Number:
- NA0003525; SC0019246; DMS-1616353
- OSTI ID:
- 1882875
- Alternate ID(s):
- OSTI ID: 2331464
- Report Number(s):
- SAND-2022-0041J; 702770; TRN: US2307942
- Journal Information:
- Journal of Computational Physics, Vol. 453; ISSN 0021-9991
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
Surface PDEs
Stochastic processes on surfaces
Meshless methods
Generalized Moving Least Squares (GMLS)
First passage time statistics
Path-dependent statistics
97 MATHEMATICS AND COMPUTING
statistical mechanics
first passage times
stochastic processes
differential geometry
scientific computation