A versatile algorithm for the treatment of open boundary conditions in Smoothed particle hydrodynamics GPU models

An open boundary algorithm for weakly compressible Smoothed particle hydrodynamics (WCSPH) numerical models is presented. Open boundary conditions are implemented by means of buffer regions whereby physical quantities are either imposed or extrapolated from the fluid region using a first-order accur...

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Bibliographic Details
Published in:Computer methods in applied mechanics and engineering Vol. 342; pp. 604 - 624
Main Authors: Tafuni, A., Domínguez, J.M., Vacondio, R., Crespo, A.J.C.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01.12.2018
Elsevier BV
Subjects:
Algorithms
Boundary conditions
Boundary value problems
Central processing units
CFD
Compressibility
Computational fluid dynamics
Computer graphics
Computer simulation
CPUs
Cylinders
Fluid flow
Fluid mechanics
Free surface
Graphics processing units
Inflow
Inlet
Interpolation
Mathematical models
Open boundary
Open channel flow
Open channels
Outflow
Outlet
Parallel processing
Piercing
Smooth particle hydrodynamics
SPH
Three dimensional flow
Two dimensional flow
Water waves
CFD
65Z05
76M28
Outlet
Open boundary
SPH
Free surface
65Y05
Inlet
ISSN:0045-7825, 1879-2138
Online Access:Get full text
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Summary:An open boundary algorithm for weakly compressible Smoothed particle hydrodynamics (WCSPH) numerical models is presented. Open boundary conditions are implemented by means of buffer regions whereby physical quantities are either imposed or extrapolated from the fluid region using a first-order accurate SPH interpolation. A unique formulation has been developed which can be used for inflow, outflow, and mixed open boundary conditions. The extrapolation process from the fluid domain encompasses quantities such as velocity, density, pressure and also free-surface elevation. The algorithm has been parallelized for both CPU and general-purpose on graphics processing units (GPGPU) and it has been tested against the 2-D reference solutions of flow past a cylinder and open channel flow. Finally, its capability to simulate 2-D and 3-D complex flows such as water waves and flow past a surface-piercing extraterrestrial submarine is demonstrated.
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ISSN:0045-7825
1879-2138
DOI:10.1016/j.cma.2018.08.004