Improved prediction of 3D flows at structures

Gasowski, Y. and Cooper, A. (1999) Improved prediction of 3D flows at structures. Technical Report. HR Wallingford.

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Abstract

In determining the impact of proposed engineering works at estuary and coastal sites it is necessary to determine the flows around structures (such as training walls, breakwater and groynes). At present two-dimensional depth-integrated numerical flow models are often employed in preliminary design studies associated with such structures. However, in the presence of a structure the flow may be three-dimensional, with a significant vertical variation in the velocity. In the presence of waves the flow becomes even more complex as breaking waves can drive currents. Presently physical models are employed to determine the impact of such works at the design stage. However a numerical modelling approach may prove to be more cost-effective for such studies. The present project funded by the Construction Directorate of the Department of the Environment Transport and the Regions (DETR), has combined state-of-the-art wave and flow prediction techniques, using both finite difference and finite element modelling technologies, with the aim being to define the range of studies that might presently be undertaken using numerical modelling techniques.

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