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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 8- SPECIAL SESSIONS : BUOYANCY MODELLING IN SPH WITH APPROPRIATE BOUNDARY CONDITIONS
Author : A. LEROY(1,2), D. VIOLEAU(1,2), A. JOLY(1,2) & M. FERRAND
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?e 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 : 803,556 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Date Published : 20/04/2016
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