单体复合船型半潜体水动力系数的计算

摘要

Inordertostudytheeffectofviscosityonstemsectionsofhybridmonohull,thepaper gives two different ways to calculate hydrodynamic coefficients, and computes hydrodynamic coefficients of the same section in two different fluid domain which are viscous flow and potential flow respectively. When considering viscosity, we use the Fluent software to calculate the unsteady force which is based on the reynolds averaged navier-stokes equations ( RANSE ) , and then transform them into hydrodynamic coefficients using linear equation. On the other side, the flow field is assumed to be inviscid, and then the unsteady force without considering viscosity can be obtained through the simple Green′s function, and they also can be transformed into hydrodynamic coefficients using the same way. Though the research, it is obvious that the viscosity effect of stem sections is remarkable.%对单体复合船型半潜体首部剖面的水动力系数进行数值计算，采用在粘性流场及势流流场两种不同流场中计算相同剖面水动力系数的研究方法，研究粘性效应对首部半潜体的影响。考虑粘性时，应用Fluent求解器基于RANS方程计算考虑粘性的非定常剖面力，然后采用线性方法将其转化为考虑粘性影响的附加质量和阻尼系数。另一方面，假设流场为势流，基于简单格林函数方法计算相同剖面的不考虑粘性的非定常剖面力，用同样的转化方法得到势流场内的附加质量和阻尼系数。研究结果表明，首部半潜体的粘性影响非常明显。