Accession Number : AD1033178


Title :   Theory of Wavelet-Based Coarse-Graining Hierarchies for Molecular Dynamics


Descriptive Note : Technical Report,01 Oct 2013,30 Sep 2016


Corporate Author : US Army Research Laboratory Aberdeen Proving Ground United States


Personal Author(s) : Rinderspacher,Berend C ; Bardhan,Jaydeep P ; Ismail,Ahmed E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1033178.pdf


Report Date : 01 Apr 2017


Pagination or Media Count : 56


Abstract : We present a multiresolution approach to compressing the degrees of freedom (DoFs) and potentials associated with molecular dynamics (MD). We suggest a systematic way to accelerate large-scale MD with more than 2 levels of coarse-graining, particularly for simulation of polymeric materials. We derive explicit models for linear polymers and iterative methods to compute large-scale wavelet decompositions from fragment solutions. This approach does not require explicit preparation of atomistic-to-coarse-grained (CG) mappings, but instead uses diffusion wavelets for graph Laplacians to develop system-specific mappings. Our methodology leads to a hierarchy of system-specific CG DoFs that provide a conceptually clear and rigorous framework for modeling chemical systems at relevant model scales. The approach is capable of automatically generating as many CG model scales as necessary, that is, to go beyond the 2 scales in conventional CG strategies. Furthermore, the wavelet-based CG models explicitly link time and length scales. Finally, a straightforward method to introduce omitted DoFs is presented, which plays a major role in maintaining model fidelity in long-time simulations and capturing emergent behaviors.


Descriptors :   simulations , polymers , molecular dynamics simulations , probability distributions , wavelet transforms , eigenvectors , vector spaces , degrees of freedom , eigenvalues


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE