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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Numerical simulation of swash flow using openfoam
Numerical simulation of swash flow using openfoam
Author : KARAGIANNIS N.(1), STAMPOULTZOGLOU A.(2) & PRINOS P.(3)
ABSTRACT
A swash flow numerical model, generated by bore collapse on rough beach slopes, has been developed and implemented
using the open source software OpenFoam. Numerical results are compared with experimental ones presented by Kikkert
et al (2012). It is the instantaneous generation of such a flow that creates specific turbulent and unsteady conditions in a
very short time period which is very difficult for a numerical model to simulate exactly the physical process. RANS
(Reynolds averaged Navier Stokes) equations are solved in conjunction with the RNG (Renormalisation Group) k-
turbulence model while VOF (Volume of fluid) method is used for the 'tracking" of the free surface. Suitable boundary and
initial conditions are chosen with the initial k and ones being extremely important. Numerical velocities and turbulent
kinetic energy profiles at specific times, depth average velocities, surface elevation and bed shear stress are presented for
different k- initial values and are compared satisfactorily with available experimental measurements. Moreover, the k-
SST turbulence model was also used with different k- initial conditions. Comparison of the computed results indicates
that RNG k- model yields better results for this kind of flow. The selection of the turbulence model and the initial
conditions is very crucial for the correct simulation of the aforementioned swash flow.
File Size : 2,872,267 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 12/08/2015
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