Calibrating time development of scour and backfilling around vertical pile using Immersed Boundary method

Rohit Kulkarni, Erik Damgaard Christensen, Peter Troch, W. Alexander Breugem, Boudewijn Decrop, Yalan Song, Xiofeng Liu

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Abstract

In recent years, the focus on scour modeling has increased the understanding of the processes involved and the time scales associated with the scour hole development. Although there is still very little work outlining the backfilling process as well as modelling of the time scale development of the scour hole itself. The understanding of backfilling was furthered by Sumer et al. (2013), where they investigated the timescales and equilibrium scour depths related to backfilling. The initial numerical models focused on recreating the equilibrium scour conditions and only recently the time development of scour along with some focus on backfilling has been investigated with physical models.

It is important to understand the backfilling conditions to optimize the scour protection measures for any given structure. The current research looks to build on this knowledge by presenting a model in OpenFOAM which has been calibrated to scour development in physical model tests conducted in Sumer et al. (2013). The base code has been developed by Song et al. (2020). The model uses the Immersed Boundary method to define the sediment bed boundary with an improved technique for calculation of y+ values (non-dimensional distance from wall to first live mesh node, based on near bed velocity) in the log-law region.

The current version of the code has been extended to represent waves to allow modeling of hydrodynamic processes responsible for scour backfilling. The model recreates the physical model test setup with considerable accuracy. The backfilling patterns are also promising and the model shows potential to be developed as a tool to study the related time scales.
Original languageEnglish
Title of host publicationProceedings of the 11th International Conference on Scour and Erosion
EditorsThor Ugelvig Petersen, Shinji Sassa
Number of pages12
PublisherInternational Society for Soil Mechanics and Geotechnical Engineering
Publication date2023
Publication statusPublished - 2023
Event11th International Conference on Scour and Erosion - Copenhagen, Denmark
Duration: 17 Sept 202321 Sept 2023

Conference

Conference11th International Conference on Scour and Erosion
Country/TerritoryDenmark
CityCopenhagen
Period17/09/202321/09/2023

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