Pseudo-fluid Particles for Fluid-rigid Body Coupling in SPH

The present study introduces the concept of pseudo-fluid particles for modeling fluid-rigid body interaction in Smoothed Particle Hydrodynamics (SPH). Such particles obey rigid body dynamics in a fully coupled framework with fluid pressure forces acting as external excitations for the object. The pr...

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Bibliographic Details
Published in:KSCE journal of civil engineering 2018, 22(11), , pp.4194-4204
Main Author: Mahdavi, Ali
Format: Article
Language:English
Subjects:
Algorithms
Civil Engineering
Coastal and Harbor Engineering
Computational fluid dynamics
Computer applications
Computer simulation
Computing costs
Conservation equations
Dynamics
Engineering
External pressure
Fluid flow
Fluid pressure
Forces (mechanics)
Frameworks
Geotechnical Engineering & Applied Earth Sciences
Hydrodynamics
Hydrostatic pressure
Industrial Pollution Prevention
Mathematical models
Modelling
Pressure
Pressure distribution
Rigid structures
Rigid-body dynamics
S waves
Simulation
Smooth particle hydrodynamics
Stress concentration
Wave generators
토목공학
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Summary:The present study introduces the concept of pseudo-fluid particles for modeling fluid-rigid body interaction in Smoothed Particle Hydrodynamics (SPH). Such particles obey rigid body dynamics in a fully coupled framework with fluid pressure forces acting as external excitations for the object. The proposed algorithm allows treating the actual rigid body as a hollow shape composed of few layers of pseudo-fluid particles, the mass of which is introduced as an input data, rather than computed by summing up the contribution from individual particles. This decreases the computational cost by reducing the number of particles to be involved in the simulation. A modification is introduced in the discretized mass conservation equation which improves the computational accuracy when the flow is mostly dominated by hydrostatic pressure distribution. To highlight the role of this modification, a buoyant floating object is shown to properly maintain its initial equilibrium over relatively long simulation time. The efficiency of proposed model is then evaluated by reproducing the well-known Scott Russell’s wave generator in three cases, followed by the wedge water entry problem. Comparisons with available experimental measurements demonstrate reasonable agreement in predicting different aspects of generated flow field.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-018-2613-y