Investigation of Numerical Schemes and Their Effects on Impact Pressures in Numerical Modelling

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2022-2-08

Author

Çandır, Semih Batuhan

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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.

Subject Keywords

impact pressure, dam break, numerical model, numerical schemes

URI

https://hdl.handle.net/11511/96268

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. B. Çandır, “Investigation of Numerical Schemes and Their Effects on Impact Pressures in Numerical Modelling,” M.S. - Master of Science, Middle East Technical University, 2022.