Kevin Franke flytur fyrirlestur um verkefni sitt til meistaraprófs í byggingarverkfræði. Verkefnið ber heitið: Investigation of the Complex Flow in High Energy Spillways by Means of Computational Modelling and Experiments.
The hydrodynamics in open channel flows are most challenging and obey complex physical laws. The air-water mixture from an artificially aerated spillway flowing down to a canyon may create major erosion and damage both the spillway´s surface and the environment. In this case, the location of an aerator to prevent cavitation scour, decreasing the energy head of the flow, and the aeration flow rate would be important factors in designing an environmental friendly high-energy spillway. Nevertheless, for an accurate determination the evolvement of an aerated flow depending on bubble sizes and their distribution, suspended particles and the geometry of the aerator have to be taken into account. In this work, experiments and simulations are carried out to understand the complexity of high-energy spillway flows. The simulations are based on numerical modelling, which is a combined large-eddy simulation technique (LES) and discrete element method. Three-dimensional simulations of an aerator are performed on a graphics-processing unit (GPU). The results are in agreement with the experiments and confirm prior findings from physical models such as formation of bubble size, bubble coherence and separation and air concentration profiles. This promising effort in GPU computing could pave the way for developing advanced simulation techniques for the study of waterways and ports, as well as coastal and ocean engineering in the future.
Leiðbeinendur: Piroz Zamankhan, Sigurður Magnús Garðarsson
Prófdómari: Andri Gunnarsson, verkfræðingur og verkefnisstjóri vatna-, veður- og jöklamælinga hjá Landsvirkjun