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1 Topic: Continuum-Particle Simulation Software (COPSS-Hydrodynamics) Presenter: Jiyuan Li, The University of Chicago 2017 Summer School 1
2 What is Continuum-Particle Simulation? Continuum simulation (Grid-based) solves Partial Differential Equations on discretized grids or meshes (Finite element method, Finite difference method, Boundary element method, etc.) Particle simulation (Particle-based) solves Equation of Motion, e.g., Netwon 2 nd law, to evolve positions and velocities of discrete particles (Molecular dynamics, Dissipative particle dynamics, etc.) Continuum-particle coupling aims solve complex materials/physics problems (multiple length-scales, phases, and physics) 2
3 Hydrodynamics 3 Confined walls Hydrodynamics Chan, EY et al. Moving particles in continuous fluid can disturb the flow field, which affects the motions of all the other particles within the field. Hydrodynamics: in-direct interactions mediated by fluid. Many-body and long-range à expensive
4 Hydrodynamics Stokes equations: Unconfined space: Able to solve it analytically (free-space Green s function of Stokes equation) Confined space: Directly FEM cause singularity x i f i singularity
5 Hydrodynamics Challenge 1: Confined space 1. Satisfy non-slip boundary conditions à no analytic solution is available in complex geometries. 2. Directly using standard FEM will cause singularities in the solutions Challenge 2: Brownian motions of particles 1. Conserve Fluctuation-dissipation theorem : coupling dynamics of particles (Brownian dynamics) with dynamics of fluid (stokes flow). DNA diffusion within confined channel 5
6 Parallel Finite Element Generalized Geometry Ewaldlike method (pfe-ggem) Step 1. Solve Stokes flow using GgEm (O(N)), satisfying non-slip boundary conditions and avoid singularity. Step 2. Evolving particle motions using stochastic PDE. 6
7 Step 1: solve stokes flow using GgEM xv fv x Local global
8 Step 2: Evolving particle motion using Stochastic PDE M F = U R: the positions of particles U 0 : undisturbed velocities of particles (induced by pressure driven flow, shear, etc) M: mobility tensor (cannot be explicitly built) F: non-hydrodynamic and non-brownian force (electrostatic, spring force, etc.) dw: random vector with mean zero and variance dt Midpoint time integration scheme. Fixman, J. Chem. Phys, 69, 1527 (1978) M*Vec = solution of Stokes induced by Vec ~ M*Vec
9 COPSS-Hydrodynamics: parallel performance Each time step requires multiple solves of Stokes equation, thus an efficient and parallel Stokes solver is necessary. X., Zhao, J., Li, X. Jiang, J. Hernandez-Ortiz, J. J de Pablo. JCP, 2017
10 COPSS-Hydrodynamics: correct diffusion behavior X., Zhao, J., Li, X. Jiang, J. Hernandez-Ortiz, J. J de Pablo. JCP, 2017
11 COPSS-Hydrodynamics: complex geometry X., Zhao, J., Li, X. Jiang, J. Hernandez-Ortiz, J. J de Pablo. JCP, 2017
12 COPSS-Hydrodynamics: rigid particles Particle sedimentation under gravity within a confined channel. Particle shapes can be arbitrary in COPSS-Hydrodynamics. 10 particles with different shapes/sizes 2600 tracking points P2-P1 mixed element (Hex20) elements 145,696 degrees of freedom 2580 time steps 12
13 Summary: COPSS-hydrodynamics relies on Stochastic PDE for trajectory integration. Each integration step requires multiple solves of Stokes equation using a parallel O(N) algorithm, pfe-ggem. COPSS-Hydrodynamics can work with complex confined geometries. COPSS-Hydrodynamics can work with rigid-particles with arbitrary shapes. Implement of user-defined features, force fields, geometries, etc., is straight- -forward. 13
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