Çeşmeci, BurakMartı, Ali İhsan2024-12-112024-12-112023978-625-6488-05-2https://hdl.handle.net/20.500.13091/9758Existing within hydraulic structures and having various characteristics, spillways are the important parts of the water structures. Instead of commonly used sharp-edged or wide-flange weirs, this study considered D Type Piano Key Weirs (PKW) that are new trend weirs constructed on rivers or open channels nowadays. Four different models with PK (Wi/Wo)= 1.00 value were formed in the study, where PK is the ratio of entrance key width (Wi) to the exit key width (Wo). For constant PK value, the effects of changing weir lengths (L) and heights (P) on the results were observed. Models were designed with same weir length but varying weir height, on the other hand the other set of models had the varying weir length but constant weir height. In order to determine the effects of designed models on the discharge efficiency, the different four PKW models were analyzed experimentally and numerically. While the experimental models were tested in a rectangular open channel in the laboratory, the numerical models were analyzed in ANSYS-Fluent software used for Computational Fluid Dynamics (CFD) problems. The numerical and experimental results were compared and evaluated using the diagrams of Discharge (Q)–Weir Head (H) and Discharge Coefficient (Cd)– Weir Head (H/P). Finally, it was determined that the increasing P and L values decreased the weir head that can provide big amount of discharges to be transferred more efficiently.info:eu-repo/semantics/openAccessWeirOpen ChannelCFDPiano Key WeirsANSYS-FluentConference Object