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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Buoyancy modelling in sph with appropriate boundary conditions
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 kC 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.
File Size : 1,158,636 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 13/08/2015
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