Seite - 1448 - in Book of Full Papers - Symposium Hydro Engineering

COMPARISON OF SELECTED SOFTWARE FOR 3D FLOW MODELING AT THE DAM SPILLWAY Ing. Jan HÖLL Dam safety engineer in VODNÍ DÍLA - TBD a. s. Ing. Matouš HOLINKA Ph.D. student at BRNO UNIVERSITY OF TECHNOLOGY Ing. Jiří HODÁK, Ph.D. Head of Department Brno in VODNÍ DÍLA - TBD a. s., vice-chairmen in cluster CREA Hydro & Energy, z.s. CZECH REPUBLIC 1. PREFACE Numerical modelling of water flow has been accelerated in recent years by more affordable computer performance and software products for that purpose. Numerical modelling has recently, in some cases, replaced physical models. Sometimes it is worth using their combination, usually with the aim to reduce modelling costs in general. In the case of simple side channel spillways of water works, it is clear that numerical modelling can be used very well for all flow discharges and new possible designs of the spillway geometry as well. Therefore, the objective of this paper was to compare the possibilities of 3D numerical modelling of water flow on the side channel spillway with three software products. The question was not which one is best, but which one is more suitable for special needs of users. The article further describes the difficulty of working with individual software products, especially user interface, setting options, solution speed and accuracy of the results. A common input for all three solvers is an imported STL file, which is individually modified for each program. In the pre-processing section, the differences are mentioned in the settings among the programs themselves. Another objective of the project was to compare these modelling procedures, to show their differences and compare the outputs to each other. The task outcomes were not primarily focused on the quality (details) of outputs. Also, it was not a priority to compare numerical models with a physical model. The subject of modelling was to create a corresponding virtual model with acceptable simplifications of real geometry. The real structure of the selected spillway was geodetically measured and a 3D spatial model in CAD software was created. 1448