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Rigorously Quantifying Uncertainties for Transport Phenomena in Molecular Simulations- [electronic resource]
Rigorously Quantifying Uncertainties for Transport Phenomena in Molecular Simulations - [e...
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Rigorously Quantifying Uncertainties for Transport Phenomena in Molecular Simulations- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214101916
ISBN  
9798380478304
DDC  
620
저자명  
Li, Yuanhao.
서명/저자  
Rigorously Quantifying Uncertainties for Transport Phenomena in Molecular Simulations - [electronic resource]
발행사항  
[S.l.]: : Carnegie Mellon University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(122 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
주기사항  
Advisor: Wang, Gerald J.
학위논문주기  
Thesis (Ph.D.)--Carnegie Mellon University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약The field of computational materials science faces various challenges in data processing, including dealing with high-dimensional parameter spaces and error analysis. Uncertainty quantification has become crucial for interpreting the results of materials simulations. We begin by discussing the fundamentals and challenges associated with addressing uncertainties in molecular-dynamics (MD) simulations. Subsequently, we address two problems at the heart of uncertainty analysis for MD simulations. In the first problem, under the assumption that we have a large dataset consisting of numerous statistically independent MD datasets (each of which can be used to estimate a quantity of engineering interest via, e.g., regression analysis), we investigate the statistical confidence we can build using the large dataset as a whole. In the second problem, we study physical settings in which the assumption underlying the first problem is likely to fail, namely, settings in which nominally independent MD datasets are not in fact independent. Both problems have significant relevance for the interpretation of simulations of many nanoscale phenomena (e.g., confined fluid diffusion or heat transfer at fluid-solid interfaces).We discuss an approach for conducting regression analysis on time series data designed to circumvent the challenges posed by the first problem. Additionally, we explore an approach rooted in thermodynamic principles that accelerates the decorrelation between consecutive MD measurements, offering a solution to the second problem. Leveraging these approaches, we study thermal transport properties at a fluid-solid interface. Finally, we propose a Heteroscedastic Gaussian Process Regression workflow to model fluid self-diffusion coefficient as a function of thermodynamic conditions.
일반주제명  
Engineering.
일반주제명  
Environmental engineering.
일반주제명  
Civil engineering.
키워드  
Molecular-dynamics
키워드  
Materials simulations
키워드  
Thermodynamic conditions
키워드  
Fluid-solid interface
기타저자  
Carnegie Mellon University Civil and Environmental Engineering
기본자료저록  
Dissertations Abstracts International. 85-04B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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