基于船舶阻力计算方法确定浮泥的适航密度值

摘要

Following the model test for ship resistance measurement, the method based on ship resistance cal-culation was proposed to determine the nautical density of fluid mud. The CFD method based on solving the NS equations was applied to calculate the resistance of ship advancing in fluid mud. The modified Herschel-Bulkley model was employed to describe the constitutive relation of fluid mud. To test its performance, the proposed method was applied to calculate the resistance of a KVLCC2 tanker in fluid mud dredged from Lianyun port. Based on the mathematical analysis of the changing trend between computed ship resistance and mud density, the nautical densi-ty for this port was defined as 1 210 kg/m3, which agreed well with the values defined by the rheology test and ship model test.%效仿通过船模阻力试验来界定浮泥适航密度值的方法,提出采用船舶阻力计算方法确定浮泥的适航密度值.基于求解NS方程的CFD方法,建立了模拟浮泥中船舶运动流场的数学模型,模型中浮泥的本构关系用改进的Herschel-Bulkley模型来描述.以连云港航道现场泥样和超大型油船KVLCC2为例,采用所建立的数学模型计算了船舶以不同速度在不同密度浮泥中航行受到的阻力.通过数学手段分析了船舶阻力随浮泥密度变化的趋势,确定该港口航道浮泥的适航密度值为1 210 kg/m3,该值与采用流变试验方法和船模阻力试验方法得到的适航密度值接近,证明了文章提出方法的有效性.