Investigation of numerical schemes and their effects on impact pressures in numerical modelling

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2022

Tezin Dili: İngilizce

Öğrenci: SEMİH BATUHAN ÇANDIR

Danışman: Cüneyt Baykal

Özet:

Impact pressure is generated with the high-speed fluid impact into a stationary solid or vice versa. Impact pressure is a phenomenon that has been studied extensively in ship hydrodynamics, but the exact determination of forces acting on a coastal structure in a numerical environment has been a challenge for coastal engineers for a long time. Due to their complex structure of a two-phase flow involving both water and air, it is very time-consuming to properly model and solve this type of problem. This study aims to investigate different numerical schemes and their effects on the impact pressures. A dam break case was used to determine the performance of these numerical schemes, and the numerical model was validated using a physical experiment. Percent error was used to compare the peak pressure value accuracies between schemes, and root mean square and mean absolute errors were used to assess the overall performance of the numerical model. This study might provide a basis for numerical modelling studies on numerical approaches depending on the aim of the research. It is possible to improve the peak pressure prediction performance up to 99% and overall performance up to 37.5% using specific scheme combinations.