CFD modelling of air entrainment and sediment in open-channels using OpenFOAM

在许多水资源基础设施中，空气夹带是一个共同的问题。水处理设备使用气泡（夹带空气）将臭氧、氧气、空气和二氧化碳等气体转移到水中。气泡也用于除砂室中，以悬浮轻质固体，同时允许较重的固体（砂砾）沉降以去除。准确地模拟夹带的空气和沉积物是困难的，主要是由于正确定义气泡几何形状和气泡之间发生的复杂相互作用的问题，NHC目前有兴趣将OpenFOAM应用于涉及空气夹带和沉积物输运的项目。拟议项目的主要目标是展示在开放环境中成功实施气泡和沉积物模型。源计算流体动力学（CFD）软件OpenFOAM基于明渠流的案例研究。第二个目标是开发一种简单的方法，将OpenFOAM纳入NHC的日常工作流程，利用已开发的airentrainment和沉积物模型。NHC和舍布鲁克大学（UdeS）之间的合作将为OpenFOAM如何有效地用于涉及空气和沉积物的复杂水利工程提供见解。所获得的知识将使NHC能够投标以前无法实现的项目，并使NHC在投标中更具竞争力，从而促进其未来的可行性。NHC将通过使用开源平台获得技术优势，而不是其他依赖商业软件和过高许可费的公司。因此，确保像NHC这样的加拿大公司的竞争力符合加拿大和加拿大经济的利益。

Air entrainment is a common concern in a number of water resource infrastructures. Water treatment facilitiesuse bubbles (entrained air) to transfer gases such as ozone, oxygen, air, and carbon dioxide into water. Bubblesare also used in grit removal chambers to suspend light solids, while allowing heavier solids (grit) to settle outfor removal. Modeling entrained air and sediment accurately is difficult mainly due to problems of properlydefining the bubble geometry and the complex interactions that occur between bubbles, sediment and water.NHC currently has an interest in applying OpenFOAM for projects involving air entrainment and sedimenttransport.The principal objective of the proposed project is to demonstrate the successful implementation of bubbleand sediment models in the open-source computational fluid dynamics (CFD) software OpenFOAM based onan open-channel flow case study. The secondary objective is to develop a simple methodology forincorporating OpenFOAM in NHC's day-to-day workflows which takes advantage of the developed airentrainment and sediment models.This collaboration between NHC and the Université de Sherbrooke (UdeS) will provide insights into howOpenFOAM can be effectively employed for complex hydrotechnical projects involving air and sediment. Theknowledge gained will enable NHC to bid on previously unattainable projects and allow NHC to be morecompetitive in its bid thus promoting its future viability. NHC will gain a technical advantage by using anopen-source platform over other companies who depend on commercial software and excessive licensing fees.Assuring the competitiveness of Canadian owned companies like NHC is thus in the interest of Canada andCanada's economy.