Fluid-Particle Multiphase Flow Simulations for the Study of Sand Infiltration into Immobile Gravel-Beds

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1 3rd JUQUEEN Porting and Tuning Workshop Jülich, 2-4 February 2015 Fluid-Particle Multiphase Flow Simulations for the Study of Sand Infiltration into Immobile Gravel-Beds Tobias Schruff, Roy M. Frings, Holger Schüttrumpf Institut für Wasserbau und Wasserwirtschaft (IWW) RWTH Aachen University, Aachen 1

2 INTRODUCTION The Riverbed Quelle: U.S. Geological Survey Permeability and porosity can be reduced due to human induced fine sediment infiltration 2

3 Conents Objectives Methods The Cube Particle Flow Simulation Fluid Flow Simulation Fluid-Particle Coupling HPC Performance Simulation Examples Gravel-Bed Packing Sand Infiltration 3

4 OBJECTIVES State of Research Major Research Questions Which parameters influence fine sediment infiltration? How does fine sediment infiltration affect riverbed porosity and permeability? Answers so far Few case studies Thereofore Development of high performance computing numerical model for systematic investigation of fine sediment infiltration process 4

5 METHODS Model The Cube 5

6 METHODS Particle Flow Simulation (Sediments) Software: pe (physics engine) C++ framework for massively parallel rigid body simulations Support for many parallelization concept (Threads, OpenMP, MPI) Software infrastructure for various rigid body simulation algorithms (DEM, RBD, ) 6 Developed by Chair for System Simulation, Friedrich-Alexander University Erlangen-Nürnberg (www10.informatik.uni-erlangen.de)

7 METHODS Fluid Flow Simulation (River) Software: walberla (widely applicable Lattice Boltzmann framework from Erlangen) Fluid flow simulations based on the Lattice Boltzmann Method (LBM) Very good parallel performance Handles complex boundaries easily 7 blood flow through artery turbulent flow (Re ~ 10,000) around sphere Designed as an HPC software framework Grid refinement Largest simulation: 1,835,008 processes Hybrid parallelization: MPI + OpenMP Open source

8 METHODS Fluid-Particle Coupling Particles and fluid are fully coupled (4-way coupling) Coupling based on (Particulate) Immersed Boundary Method (IBM) (Particulate particles are represented by one Lagrangian point) Particles can be smaller than one fluid cell Fluid and particle simulation timestep can be tuned individually 8

9 METHODS HPC Performance (particle flow only) 16 speedup [real] speedup [ideal] 8 Speedup 4 2 [ideal] if the number of cores doubles the speed doubles too (strong scaling) Number of cores 9

10 METHODS HPC Performance (fluid flow only) 4 speedup [real] almost ideal scaling behaviour speedup [ideal] Speedup Number of cores (strong scaling) 10

11 SIMULATION EXAMPLES Gravel-Bed Packing domain decomposition (9 cores) 11

12 SIMULATION EXAMPLES Sand Infiltration domain decomposition (4 cores) 12

13 THANKS FOR YOUR ATTENTION!??? QUESTIONS??? 13

14 METHODS Lattice Boltzmann Method (LBM) Operates on uniform grid with multiple particle distribution functions per cell (D2Q9, D3Q19, D3Q27, ) Explicit method (no iterations necessary) Two steps: stream (neighbors) & collide (cell-local) For the collision, different operators exist: SRT, TRT, MRT Macroscopic quantities (velocity, density, ) can be calculated from the particle distribution functions 14

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