CAJ | 학술논문

针对舰船气流场数值模拟的计算效率问题，提出在雷诺数无关性、无粘假设、非定常流场的稳态计算，以及离散格式、湍流模型、流场算法等方面进行考虑，以护卫舰简化模型S FS为对象，对雷诺数无关性、无粘假设、非定常流场的稳态计算等的具体应用进行了研究，检验分析了应用的可行性和存在的不足，部分数值模拟结果与试验进行了对比，得到的主要结论为：运用舰船气流场雷诺数无关性，在一个风向上只需要对一种风速条件进行数值模拟，其他风速下的流场特征可通过线性转换得到，无须再单独计算。采用无粘假设对舰船气流场进行数值模拟，能够提高计算速度30％以上，且可降低建模工作量。采用稳态计算方法来获取本质上为非稳态的舰船气流场特征，计算时间相比瞬态计算存在数量级的差别，但稳态计算结果只适合用来做定性分析。在保证网格有较高的正交化程度的前提下，采用低阶离散格式可提高计算效率，且精度基本不受影响。为保证计算效率，可优先选用RANS湍流模型和SIMPLER ，PISO流场算法。
침대함선기류장수치모의적계산효솔문제，제출재뢰낙수무관성、무점가설、비정상류장적은태계산，이급리산격식、단류모형、류장산법등방면진행고필，이호위함간화모형S FS위대상，대뢰낙수무관성、무점가설、비정상류장적은태계산등적구체응용진행료연구，검험분석료응용적가행성화존재적불족，부분수치모의결과여시험진행료대비，득도적주요결론위：운용함선기류장뢰낙수무관성，재일개풍향상지수요대일충풍속조건진행수치모의，기타풍속하적류장특정가통과선성전환득도，무수재단독계산。채용무점가설대함선기류장진행수치모의，능구제고계산속도30％이상，차가강저건모공작량。채용은태계산방법래획취본질상위비은태적함선기류장특정，계산시간상비순태계산존재수량급적차별，단은태계산결과지괄합용래주정성분석。재보증망격유교고적정교화정도적전제하，채용저계리산격식가제고계산효솔，차정도기본불수영향。위보증계산효솔，가우선선용RANS단류모형화SIMPLER ，PISO류장산법。
For rapid predication of characteristics of ship air flow fields by CFD ,Reynolds number inde‐pendence ,unviscous assumption ,steady computation replacing time‐accurate simulation were pro‐posed .It was also emphasized that discretization schemes ,turbulence models ,flow algorithms are some factors not to be ignored for rapid ship airwakes predication .The feasibility and deficiency of ap‐plication of Reynolds number independence ,unviscous assumption ,and steady computation replacing time‐accurate simulation on ship airwakes predication were studied through a generic 3D frigate mod‐el .Part of the simulation results were checked by experimental data .The results of these studies show that ,based on the Reynolds independence ,only one solution need be run for each wind angle of interest .Based on unviscous assumption ,the computational speed of ship airwakes could improve up to 30% ,and less the word load of meshing .Replacing the time‐accurate simulation with steady simu‐lation ,the cost of time could be reduced substantially ,however ,the steady simulation can only be ac‐cepted for qualitative characteristics of ship air flow fields .On the premise of high orthogonal quality of mesh ,computational efficiency could be improved by employing lower order discretization schemes w hen compared to higher order discretization schemes ,and the accuracy can keep at a same level . RANS turbulence model ,SIMPLER and PISO flow algorithms were prior to others for a higher com‐putational speed in CFD simulation of ship airwakes .