IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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| Buoyancy modelling in sph with appropriate boundary conditions |
| Author : |
A. LEROY(1,2), D. VIOLEAU(1,2), A. JOLY(1,2) & M. FERRAND(2) |
ABSTRACT
Buoyancy effects due to active scalars (e.g. temperature) are important in industrial and environmental flows. In case of
flows presenting complex fluid interfaces (e.g. distorted free-surface) or fluid/structure interactions, Lagrangian methods
make it easier to capture all the flow structures (wave breaking, fluid mixing). The purpose of the present work is to
model temperature advection/diffusion coupled with turbulence through the SPH (Smoothed Particle Hydrodynamics)
Lagrangian numerical method. Buoyancy is modelled with a Boussinesq approximation, the pressure being solved from
a Poisson equation. Turbulence/buoyancy coupling is handled by a k¨C¦Å model including buoyancy terms. The main
progress in this work is the treatment of boundary conditions (BC) in SPH. For wall BC, the so-called semi-analytical
approach is applied, while a new method is used to treat open (inlet/outlet) BC. This combined approach proved being
very efficient, SPH providing velocity, pressure, temperature and turbulent profiles in excellent agreement with the Finite
Volume method for confined flows. The 3-D extension is rather straightforward and is based on a GPU-programming for
computational efficiency. Applications to confined unsteady flows are presented.
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| File Size : |
1,158,636 bytes |
| File Type : |
Adobe Acrobat Document |
| Chapter : |
IAHR World Congress Proceedings
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| Category : |
36th Congress - The Hague (2015) ALL CONTENT
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| Article : |
Special sessions
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| Date Published : |
13/08/2015 |
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