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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Numerical prediction of hydrodynamic force acting on a natural stone in openchannel flows
Numerical prediction of hydrodynamic force acting on a natural stone in openchannel flows
Author : KEISUKE YOSHIDA(1), SATORU USHIJIMA(2), RYUJI TANAKA(1), NOBU MIYAGI(3) & SHIRO MAENO(1)
ABSTRACT
This study examines a numerical method that accommodates hydrodynamic forces acting on natural stone in openchannel
flows. Numerical accuracy was verified through comparison with experimentally obtained results. We conducted
three experiments with a stone model made of reinforced plastic, adjusting the flow discharge in a straight rectangular
open-channel with a flat bed. For those experiments, we measured not only the drag force and lift force, but also the
vertical velocity distribution of streamwise flow approaching in front of the stone. Additionally, we conducted numerical
simulations to evaluate the forces acting on the numerically modelled stone. We approximately generated the numerical
stone using tetrahedron elements in terms of a stone shape, imitating the actual model stone. For the computation model,
we considered the mechanical interactions between fluid motions and the modelled stone, which behaves as a rigid body.
Results show that numerical data related to the hydrodynamic forces are consistent with the experimental measurements.
Therefore, the validity of our computation method was demonstrated.
File Size : 2,387,896 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 14/08/2015
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