Çeşmeci, BurakMartı, Ali İhsan2024-12-112024-12-112023978-625-6488-05-2https://hdl.handle.net/20.500.13091/9757Spillways are significant engineering structures constructed from past to present to perform their important functions within the water structures. There are many studies about linear weirs (sharp edged, wide-flange) placed on open channels to measure the discharge. In this study, three different D type PKW models with P=20 cm height were used to investigate the piano key weirs (PKW), types of PKW and the geometric parameters used for PKW. In order to find out the effect of the change in PK (the ratio of entrance key width to the exit key width, Wi/Wo) on the discharge efficiency, the weir height (P) and the weir length (L) were set constant. Hence, three different D type PKW models were designed with L=30 cm, P=20 cm and PK= 1.00, 1.25 and 1.50 values on which experimental and numerical analyses were made. While the experimental models were built and tested in a rectangular open channel in the laboratory, the numerical models were formed and analyzed in ANSYS-Fluent commonly used for Computational Fluid Dynamics (CFD) problems. The results of numerical and experimental studies were examined and compared on Discharge (Q)–Weir Head (H) and Discharge Coefficient (Cd)–Dimensionless Weir Head (H/P) diagrams. As a result of the studies, it was observed that the increase in PK value decreased the weir head which means a more efficient model was obtainedeninfo:eu-repo/semantics/openAccessSpillwayCFDANSYS-FluentOpen ChannelPKWConference Object