Aydogdu Mahmut
Department of Civil Engineering, Faculty of Engineering and Natural Sciences, Malatya Turgut Ozal University, Malatya, 44900, Türkiye.
Sci Rep. 2025 Jul 1;15(1):21308. doi: 10.1038/s41598-025-06267-4.
In addition to consuming, using, and benefiting from it, it has sometimes become necessary to establish defense mechanisms against water. In particular, precautions against floods, torrents, and sediment transport in the flow have been essential. Since they damage settlement areas, disrupt aquatic life, and affect productive lands, various water structures have been built to address these issues. Among these structures are spur dikes specifically constructed for this purpose. In this study, a new spur dike structure was designed by taking inspiration from the Eğri Bridge located within the borders of Sivas province. Various experiments were carried out by arranging the spur dikes made of quality waste material on both sides of the open channel in an asymmetrical arrangement. CFD technology was used to see the effect of this designed structure on the flow hydraulics and characteristics more clearly. For this purpose, Standard k-ε, RSM, and LES models were compared with different data groups. Two configuration models of the same geometry were used in this study. AS-1 and AS-2 represent arrangement models numbered 1 and 2, respectively. Model verification of numerical data was performed for all flow rates of the AS-1 and AS-2 configurations. Firstly, water surface profiles were compared using experimental flow depths. Then, energy dissipation values were compared using flow rates and depth values. Additionally, separations in the streamlines occurring in the spur dike area and division eyes, along with secondary flows, turbulence, and vortex formations, were simulated. While the experimentally dissipated energy approached a maximum of 65%, it remained around 50% in the RSM and LES models. The RSM and LES models effectively captured the vortices and eddies between the spur dikes. While the vorticity magnitude reached a maximum of 200 1/s for Case AS-1, 300 1/s values were obtained for Case AS-2. This phenomenon had a direct impact on the amount of energy dissipation. The power to capture the vorticity magnitude values in total can be listed as Standard k-ε < RSM < LES. Additionally, better water surface profiles were obtained from both models when compared to the Standard k-ε turbulence model. For high flow rates (for Q = 9.33 and Q = 11.12 l/s), the VOF-RSM and VOF-LES models captured the cases where the mesh cell was over 75% full of water. However, we can say that the VOF-LES model is more economical because the solution time is shorter. The results blend the effects of past field applications with future technology on a new design.
除了消耗、使用和从中受益外，有时还必须建立防水的防御机制。特别是，防范洪水、急流以及水流中的泥沙输送至关重要。由于它们会破坏居民区、扰乱水生生物并影响生产用地，因此已建造了各种水工建筑物来解决这些问题。其中为此专门建造的丁坝。在本研究中，借鉴位于锡瓦斯省境内的埃格里桥设计了一种新型丁坝结构。通过将由优质废料制成的丁坝以不对称方式布置在明渠两侧进行了各种实验。使用计算流体动力学（CFD）技术更清楚地了解这种设计结构对水流水力和特性的影响。为此，将标准k-ε模型、雷诺应力模型（RSM）和大涡模拟（LES）模型与不同数据组进行了比较。本研究使用了相同几何形状的两种配置模型。AS-1和AS-2分别代表编号为1和2的布置模型。对AS-1和AS-2配置的所有流量进行了数值数据的模型验证。首先，使用实验水流深度比较水面剖面。然后，使用流量和深度值比较能量耗散值。此外，还模拟了丁坝区域流线中的分离以及分流眼，以及二次流、湍流和涡旋形成。实验中耗散的能量最高接近65%，而在RSM和LES模型中则保持在50%左右。RSM和LES模型有效地捕捉了丁坝之间的涡旋和涡流。对于AS-1工况，涡量大小最高达到200 1/s，而对于AS-2工况则获得了300 1/s的值。这种现象对能量耗散量有直接影响。总体而言，捕捉涡量大小值的能力可列为标准k-ε＜RSM＜LES。此外，与标准k-ε湍流模型相比，这两种模型都获得了更好的水面剖面。对于高流量（Q = 9.33和Q = 11.12 l/s），VOF-RSM和VOF-LES模型捕捉到了网格单元中水充满度超过75%的情况。然而，可以说VOF-LES模型更经济，因为求解时间更短。研究结果将过去现场应用与未来技术的影响融合在了一种新设计中。
