University of Tehran Press Desert 2008-0875 20 1 2015 01 01 Simulation of local scour caused by submerged horizontal jets with Flow-3D numerical model 47 55 54082 10.22059/jdesert.2015.54082 EN Mohammadali Mehnifard Javid Institute of High Education, Jiroft, Iran Sadegh Dalfardi Department of Range and Watershed Management, Faculty of Natural Resources, University of Jiroft, Jiroft, Kerman, Iran Hossein Baghdadi Consulting Engineer, Saze Ab Halil Co., Jiroft, Iran Zeinab Seirfar Consulting Engineer, Saze Ab Halil Co., Jiroft, Iran Journal Article 2014 07 06 One of the most concerning issues for researchers is to predict the shape and dimensions of the scour pit near<br />hydraulic structures such as the base of bridges, weirs, valves and stilling basins due to both financial and human<br />hazards induced by destruction of the structure. As the scour issue has its own complexity in relation to the<br />multiplicity of effecting factors on it, in this study therefore, the results of laboratory analysis of local scour due to<br />submerged horizontal jets were compared with numerical simulation results from Flow-3D three-dimensional model<br />to test the potency of the numerical model. As a result, the model is proposed in place of the experimental model<br />which has its own drawbacks and high costs. In this study, we measure maximum scour depth in relative equilibrium<br />in 2 states and 6 test modes with different valve openings and tail water depth per different discharges. Comparison<br />of the results indicates about 11% error for Flow-3D numerical model in relation to the experimental model which by<br />considering the complexity of scour and deposition phenomena, is considered a good result. https://jdesert.ut.ac.ir/article_54082_4a0ac10c4da2c90e9ce721f4111fcb3e.pdf