舰船科学技术
艦船科學技術
함선과학기술
SHIP SCIENCE AND TECHNOLOGY
2014年
8期
6-10
,共5页
单体复合船型%水动力系数%粘性%简单格林函数
單體複閤船型%水動力繫數%粘性%簡單格林函數
단체복합선형%수동력계수%점성%간단격림함수
hybridmonohull%hydrodynamiccoefficients%viscosity%thesimplegreen′sfunction
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。
對單體複閤船型半潛體首部剖麵的水動力繫數進行數值計算，採用在粘性流場及勢流流場兩種不同流場中計算相同剖麵水動力繫數的研究方法，研究粘性效應對首部半潛體的影響。攷慮粘性時，應用Fluent求解器基于RANS方程計算攷慮粘性的非定常剖麵力，然後採用線性方法將其轉化為攷慮粘性影響的附加質量和阻尼繫數。另一方麵，假設流場為勢流，基于簡單格林函數方法計算相同剖麵的不攷慮粘性的非定常剖麵力，用同樣的轉化方法得到勢流場內的附加質量和阻尼繫數。研究結果錶明，首部半潛體的粘性影響非常明顯。
대단체복합선형반잠체수부부면적수동력계수진행수치계산，채용재점성류장급세류류장량충불동류장중계산상동부면수동력계수적연구방법，연구점성효응대수부반잠체적영향。고필점성시，응용Fluent구해기기우RANS방정계산고필점성적비정상부면력，연후채용선성방법장기전화위고필점성영향적부가질량화조니계수。령일방면，가설류장위세류，기우간단격림함수방법계산상동부면적불고필점성적비정상부면력，용동양적전화방법득도세류장내적부가질량화조니계수。연구결과표명，수부반잠체적점성영향비상명현。
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.
