Çeşmeci, BurakMartı, Ali İhsan2024-12-112024-12-112023978-605-9678-36-0https://hdl.handle.net/20.500.13091/9759Water structures such as weirs have an important place in engineering studies. Past to present weirs have been built for many functions that there are many studies on sharp-edged and wide-crest (linear) weirs. In this study, recent years’ popular key weirs (PKW) were examined. D type PKW were designed with the height of P=15 cm and weir width of L=30 cm. Three different models were built to determine the change in PK value (Wi/Wo), which is the ratio of the width of the inlet key (Wi) to the width of the outlet key (Wo). Here, the key widths are adjusted to be PK=1.00, 1.25 and 1.50, respectively. By keeping the weir height and width constant, the effect of PK value on the weir head was investigated. While the experimental tests were carried out in a rectangular open channel in the laboratory to observe the PK performance of the weir, the numerical studies were executed in ANSYS-Fluent program, one of the most significant programs used in solving computational fluid dynamics (CFD) problems. Both experimental and numerical tests were performed using different discharge rates. The results obtained from the experimental and numerical studies were compared on the Flow (Q) ± Head Discharge (H) and Discharge Coefficient (Cd) ± Dimensionless Weir Head (H/P) diagrams. As a result of the studies, it was determined that the increase in PK value decreased the weir head. In this way, a new more efficient weir model was obtained.eninfo:eu-repo/semantics/openAccessWeirOpen ChannelCFDPiano Key WeirsANSYS-FluentConference Object