Akademik Veri Yönetim Sistemi
JOURNAL OF APPLIED WATER ENGINEERING AND RESEARCH, cilt.12, sa.1, ss.27-38, 2024 (ESCI)
This study numerically investigated the effects of geometric parameters of chimney weirs on the discharge coefficient (C-d). Here, chimney weirs with apex angles 74 degrees, 84 degrees, 94.4 degrees, 106 degrees and 116 degrees at two crest heights were examined. The RNG turbulence model was selected due to its greater accuracy compared to k-epsilon, k-omega and LES methods for these types of flows. With increasing discharge and crest height, the value of C-d decreases. The effect of constant C-d showed an increase in the percentage of discharge deviation from the discharge values obtained from numerical solution. Based on dimensionless variables such as ratio of water head to the crest height, the ratio of crest length to the crest height, the ratio of the vertical distance between weir crest and the first point where the weir slope changes to the crest height, and the vertex angle of the inverted triangle, non-linear polynomial regression relations were obtained.