横向水流作用下圆孔通气流场数值模拟

Numerical simulation of bubble in ventilation flow field from a circular orifice with liquid cross flow

横向水流作用下圆孔通气流场在船舶、化工及水中兵器等领域广泛出现,影响流场流动状态的因素包括但不限于横向水流速度、通气流量、通气孔直径、表面张力、重力、气体可压缩性和通气方向。该文基于有限体积方法,结合VOF界面捕捉方法与大涡模拟(LES)方法,采用商用工程软件(FLUENT),建立了横向水流作用下圆孔通气多相非定常流场的数值模拟方法,并且分析了不同的横向水流速度和通气流量时气泡参数变化规律,以及通气泡的断裂频率,分析得到拟合关系式。

The ventilation flow field from a circular orifice with liquid cross flow is widely used in ships,chemical industry,underwater weapons,etc.Factors affecting the flow status of the flow field include,but are not limited to,cross flow velocity,flow rate,orifice diameter,surface tension,gravity,compressibility,direction of ventilation.Based on the finite volume method,combined with VOF interface capture method and large eddy simulation(LES)method,the commercial simulation software(FLUENT)is used to establish a numerical simulation method for multi-phase unsteady flow field of circular orifice with liquid cross flow.The development law of bubble size,and the fracture frequency of the bubble under the conditions of the different cross water flow velocity and the flow rate are investigated and the fitting relationship is obtained.