Coupled Level-Set Volume of Fluid Simulations of Water Flowing Over a Simplified Drainage Channel With and Without Air Coflow
Coupled Level-Set Volume of Fluid Simulations of Water Flowing Over a Simplified Drainage Channel With and Without Air Coflow
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DOI：
10.4271/2017-01-1552
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
M. Dianat;M. Skarysz;G. Hodgson;A. Garmory;M. Passmore
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文献类型：
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作者：
M. Dianat;M. Skarysz;G. Hodgson;A. Garmory;M. Passmore
本文的目的是对道路车辆外表面的水流进行预测。我们给出了液体在重力作用下在固体表面上的流动的模拟，在液体上有和没有附加气动力。这是使用在开源OpenFOAM CFD代码中实现的耦合水平集流体体积方法(CLSVOF)多相方法的实现来完成的。这是一种高保真的界面解析方法，可以求解两相的速度场，不受流型的限制。本文以具有代表性的连续液体小河为例，论证了外部水管理方法(EWM)的适用性。在这种情况下，进行了记录水流运动的实验工作，并测量了液体与固体表面的接触角。描述了平衡接触角和动态接触角等液固特性的测量，以及CFD程序中接触角与毛细管数的解析表达式。将模拟结果与实验测量结果进行了比较。在0、0.5和10m/S的同向气流条件下进行了模拟，模拟结果再现了急角液体钉扎和较高风速下小河纵向拉伸等物理现象。
The motivation for this paper is to predict the flow of water over exterior surfaces of road vehicles. We present simulations of liquid flows on solid surfaces under the influence of gravity with and without the addition of aerodynamic forces on the liquid. This is done using an implementation of a Coupled Level Set Volume of Fluid method (CLSVOF) multiphase approach implemented in the open source OpenFOAM CFD code. This is a high fidelity interface-resolving method that solves for the velocity field in both phases without restrictions on the flow regime. In the current paper the suitability of the approach to Exterior Water Management (EWM) is demonstrated using the representative test cases of a continuous liquid rivulet flowing along an inclined surface with a channel located downstream perpendicular to the oncoming flow. Experimental work has been carried out to record the motion of the rivulet in this case and also to measure the contact angle of the liquid with the solid surface. The measurements of the liquid/solid characteristics such as equilibrium and dynamic contact angles are described along with the analytical expression for contact angle vs. capillary number used in the CFD code. The results from the simulations are compared to experimental measurements. The simulations are carried out with air co-flows of 0, 0.5 and 10 m/s. The simulations are seen to reproduce physical phenomena such as the liquid pinning at sharp corners and the longitudinal stretching of the rivulet with higher air velocity.