Three-Dimensional Modelling of Recirculation Behind a Groyneby Magdalena Brinckmann, Univsitat Hannover, Hannover, Germany,
Klaus-Peter Holz, Univsitat Hannover, Hannover, Germany,
Abstract: Extensive investigation on the three-dimensional flow patterns behind a groyne have been carried out in a small-scale experiment. A three-dimensional hydrodynamic numerical model is verified on the basis of these data. The main point of interest is the correct reproduction of the eddy formation its size, and the reattachment point. The representation of the turbulance and of the wall boundary turns out to be most important to reproduce the essential features of the measured data. Two improvements are carried out. First a mixing length formulation for the vertical domains is used. The second improvement concerns the boundary representation at the wall. A Neumann boundary condition to simulate the turbulent boundary layer is implemented. The results of the numerical studies demonstrate the applicability and the validity of the three-dimensional numerical model for simulation of complex flow patterns behind a groyne.
Subject Headings: Three-dimensional models | Three-dimensional flow | Numerical models | Flow patterns | Hydrologic models | Mathematical models | Groins (structure) | Walls
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