在VOF(Volume of Fluid)模型的基础上,利用DPM(Discrete Phase Model)模型对一种新型的防泥沙压载水舱进行数值模拟。采用雷诺平均N-S方程组(RANS)两方程涡粘性模式(k-epsilon)的求解模型,压力耦合方程半隐方法(SIMPLE算法)的求解算法...在VOF(Volume of Fluid)模型的基础上,利用DPM(Discrete Phase Model)模型对一种新型的防泥沙压载水舱进行数值模拟。采用雷诺平均N-S方程组(RANS)两方程涡粘性模式(k-epsilon)的求解模型,压力耦合方程半隐方法(SIMPLE算法)的求解算法对控制方程进行封闭求解。求解结果表明,新型压载水舱的防泥沙效果与进水速度V、挡板距离D、挡板高度H有关,其中,进水速度V起决定性作用。当挡板距离D和挡板高度H一定时,V越小,压载水中的泥沙越能沉积在"防泥沙小舱"中,防泥沙效果与传统的压载水舱相比有明显的改善;而V越大,越来越多的泥沙进入压载区,防泥沙效果明显下降。展开更多
Water entry of marine structures has long been an important problem in ocean engineering.Among the different techniques to predict fluid-structure interactions during water entry,smoothed particle hydrodynamics(SPH)me...Water entry of marine structures has long been an important problem in ocean engineering.Among the different techniques to predict fluid-structure interactions during water entry,smoothed particle hydrodynamics(SPH)method gradually becomes a promising method that is able to solve the impact pressure and the splashing fluid jets simultaneously.However,for three-dimensional(3D)problems,SPH method is computationally expensive due to the huge number of particles that are needed to resolve the local impact pressure accurately.Therefore,in this work an axisymmetric SPH model is applied to solve different water entry problems with axisymmetric structures including spheres and cones with different deadrise angles.Importantly,the Volume Adaptive Scheme(VAS)is added to guarantee the homogeneousness of particle volumes during the simulation.The axisymmetric SPH model with VAS scheme will be introduced in detail and the numerical results will be sufficiently validated with experimental data to demonstrate the high robustness and accuracy of the SPH model for solving 3D axisymmetric water entry problems in an efficient way.展开更多
基金Supported by Project Supported by National Key Research and Development Program of China(No.2018YFC0310400)National Natural Science Foundation of China(51779109)+2 种基金Natural Science Foundation of Jiangsu,China(BK20171306)Special Project for Innovation for ‘Seventh Generation Ultra-Deepwater Drilling Platform(Ship)’ Supported by High-Tech Ship of Ministry of Industry and Information TechnologySpecial Project for Innovation for ‘Research and Development of Deepwater Semi-Submersible Support Platform’ Supported by High-Tech Ship Ministry of Industry and Information Technology
文摘在VOF(Volume of Fluid)模型的基础上,利用DPM(Discrete Phase Model)模型对一种新型的防泥沙压载水舱进行数值模拟。采用雷诺平均N-S方程组(RANS)两方程涡粘性模式(k-epsilon)的求解模型,压力耦合方程半隐方法(SIMPLE算法)的求解算法对控制方程进行封闭求解。求解结果表明,新型压载水舱的防泥沙效果与进水速度V、挡板距离D、挡板高度H有关,其中,进水速度V起决定性作用。当挡板距离D和挡板高度H一定时,V越小,压载水中的泥沙越能沉积在"防泥沙小舱"中,防泥沙效果与传统的压载水舱相比有明显的改善;而V越大,越来越多的泥沙进入压载区,防泥沙效果明显下降。
基金supported by the National Natural Science Foundation of China(Grant Nos.12002404 and 52171329)the Natural Science Foundation of Guangdong Province(Grant Nos.2019A1515011405 and 2022A1515012084)+1 种基金the Guangzhou Basic and Applied Basic Research Project(Grant No.202102020371)the Fundamental Research Funds for the Central Universities,Sun Yat-sen University.
文摘Water entry of marine structures has long been an important problem in ocean engineering.Among the different techniques to predict fluid-structure interactions during water entry,smoothed particle hydrodynamics(SPH)method gradually becomes a promising method that is able to solve the impact pressure and the splashing fluid jets simultaneously.However,for three-dimensional(3D)problems,SPH method is computationally expensive due to the huge number of particles that are needed to resolve the local impact pressure accurately.Therefore,in this work an axisymmetric SPH model is applied to solve different water entry problems with axisymmetric structures including spheres and cones with different deadrise angles.Importantly,the Volume Adaptive Scheme(VAS)is added to guarantee the homogeneousness of particle volumes during the simulation.The axisymmetric SPH model with VAS scheme will be introduced in detail and the numerical results will be sufficiently validated with experimental data to demonstrate the high robustness and accuracy of the SPH model for solving 3D axisymmetric water entry problems in an efficient way.
基金supported by the National Natural Science Foundation of China (Grant Nos.12002404 and 52171329)the Key-Area Research and Development Program of Guangdong Province (Grant Nos.2020B1111010002 and 2020B1111010004)+1 种基金the Natural Science Foundation of Guangdong Province of China (Grant No.2022A1515012084)the Fundamental Research Funds for the Central Universities,Sun Yat-sen University.
基金supported by the Natural Science Foundation of Guangdong Province(Grant No.2022A1515012084)the National Natural Science Foundation of China(Grant No.51679053)the Guangzhou Basic and Applied Basic Research Project(Grant No.202102020371).
