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Adjoint DSMC for nonlinear Boltzmann equation constrained optimization

Journal Article · · Journal of Computational Physics

Applications for kinetic equations such as optimal design and inverse problems often involve finding unknown parameters through gradient-based optimization algorithms. Based on the adjoint-state method, we derive two different frameworks for approximating the gradient of an objective functional constrained by the nonlinear Boltzmann equation. While the forward problem can be solved by the DSMC method, it is difficult to efficiently solve the high-dimensional continuous adjoint equation obtained by the “optimize-then-discretize” approach. This challenge motivates us to propose an adjoint DSMC method following the “discretize-then-optimize” approach for Boltzmann-constrained optimization. We also analyze the properties of the two frameworks and their connections. Here, several numerical examples are presented to demonstrate their accuracy and efficiency.

Research Organization:
New York Univ. (NYU), NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
FG02-86ER53223
OSTI ID:
1849936
Alternate ID(s):
OSTI ID: 1782909
OSTI ID: 23203758
Journal Information:
Journal of Computational Physics, Journal Name: Journal of Computational Physics Vol. 439; ISSN 0021-9991
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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