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Fast Particle Methods for Multiscale Phenomena SimulationsWe are developing particle methods oriented at improving computational modeling capabilities of multiscale physical phenomena in : (i) high Reynolds number unsteady vortical flows, (ii) particle laden and interfacial flows, (iii)molecular dynamics studies of nanoscale droplets and studies of the structure, functions, and evolution of the earliest living cell. The unifying computational approach involves particle methods implemented in parallel computer architectures. The inherent adaptivity, robustness and efficiency of particle methods makes them a multidisciplinary computational tool capable of bridging the gap of micro-scale and continuum flow simulations. Using efficient tree data structures, multipole expansion algorithms, and improved particle-grid interpolation, particle methods allow for simulations using millions of computational elements, making possible the resolution of a wide range of length and time scales of these important physical phenomena.The current challenges in these simulations are in : [i] the proper formulation of particle methods in the molecular and continuous level for the discretization of the governing equations [ii] the resolution of the wide range of time and length scales governing the phenomena under investigation. [iii] the minimization of numerical artifacts that may interfere with the physics of the systems under consideration. [iv] the parallelization of processes such as tree traversal and grid-particle interpolations We are conducting simulations using vortex methods, molecular dynamics and smooth particle hydrodynamics, exploiting their unifying concepts such as : the solution of the N-body problem in parallel computers, highly accurate particle-particle and grid-particle interpolations, parallel FFT's and the formulation of processes such as diffusion in the context of particle methods. This approach enables us to transcend among seemingly unrelated areas of research.
Document ID
20000064614
Document Type
Conference Paper
Authors
Koumoutsakos, P. (NASA Ames Research Center Moffett Field, CA United States)
Wray, A. (NASA Ames Research Center Moffett Field, CA United States)
Shariff, K. (NASA Ames Research Center Moffett Field, CA United States)
Pohorille, Andrew (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 19, 2013
Publication Date
February 1, 2000
Publication Information
Publication: Welcome to the NASA High Performance Computing and Communications Computational Aerosciences (CAS) Workshop 2000
Subject Category
Fluid Mechanics and Thermodynamics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20000064579Analytic PrimaryWelcome to the NASA High Performance Computing and Communications Computational Aerosciences (CAS) Workshop 2000
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