CFD simulation of clear water scour at complex foundations

CFD simulation of clear water scour at complex foundations.
Tavouktsoglou, N.and Harris, J. and Whitehouse, R.J.S. and Simons, R.R.
In: ICSE 2018 (9th International Conference on Scour and Erosion), 5-8 November 2018, Taipei, Taiwan. (Submitted) (2018)

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Abstract:Offshore gravity base foundations (GBFs) are often designed with complex geometries. Such structures interact with local hydrodynamics, creating an adverse pressure gradient that is responsible for flow and scour phenomena, including the bed shear stress amplification and scour. At present, physical modelling and simple prediction equations have been the only practical engineering tool for evaluating scour around these support structures. However, with the increasing computation power of modern computers and the development of new Computational Fluid Dynamics (CFD) solvers, scour prediction around foundations has become possible. In the present work three-dimensional (3D) numerical modelling has been applied to reproduce local scour around a complex cylindrical base structure under the forcing of a unidirectional current in clear water scour conditions. The simulations are carried out using a state of the art three-dimensional Euler-Lagrange scour model based on the open source CFD software OpenFOAM. The fluid phase is resolved by solving modified Navier-Stokes equations, which take into consideration the influence of the solid phase, i.e., the soil particles. The solid phase is solved using multi-phase particle-in-cell (MP-PIC) approach, a method which takes into account the sediment-sediment interaction, while the particles follow Newton’s Law of Motion. The present paper also presents physical modelling results for scour around the same type of structure which were conducted for the same hydrodynamic forcing conditions as in the CFD model. The results of the experimental campaign are used to evaluate the ability of the CFD model to predict the: Time evolution of scour; Equilibrium scour depth; 3D characteristics of the scour hole.
Item Type:Conference or Workshop Item (Paper)
Subjects:Maritime > General
Coasts > General
ID Code:1490
Deposited On:09 Jul 2018 08:46
Last Modified:09 Jan 2019 13:33

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