Author(s): Yanqing Lu; Ling Zhou; Rui-Lin Feng; Zijian Xue; Yinying Hu; Qian-Xun Chen
Linked Author(s): Ling Zhou
Keywords: No Keywords
Abstract: In large-scale stormwater drainage systems, rapid flow transitions frequently occur along with multi-shaft air release and size effect problems. Focus on this scenario, this work proposed an improved mixed flow model, combining the two-phase component approach (TPA) for water part simulation and the discrete Euler method for gas part, and solved by the Godunov-type finite volume method with Random Choice Method (RCM). It was proved that the proposed model can accurately simulate complex mixed flows in large-scale multi-shaft systems with high computational efficiency, although affected by roughness discrepancy. In addition, the ventilation between multi-shafts has different staged mutual influences, in close relation to upstream head, downstream submerged boundary and shaft location. What's more, the traditional Froude scaling laws during scale conversion is suitable for mixed flows study in large-scale pipeline, while need more consideration for the conversion of pressurized air pocket between prototype size and model size.
Year: 2024