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时间:2020-05-15
《基于非结构动网格的非定常激波装配法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第1期空气动力学学报Vo1.33。No.12015年O2月ACTAAERoDYNAMICASINICAFeb.,2015文章编号:0258—1825(2015)01—001007基于非结构动网格的非定常激波装配法刘君,邹东阳,徐春光(大连理工大学航空航天学院,辽宁大连116024)摘要:从ALE方程出发,通过修正体积的新思路构建离散几何守恒律,基于非结构动网格的信息传递方法得到网格重构以后新网格的流场参数,采用一阶格式捕捉法得到的流场确定装配法的初始激波位置,成功地把激波装配法应用到非定常流动的模拟。模拟超声速飞行环境下整流罩分离的非定常流固耦合过程,在马赫数6条件下
2、装配法和捕捉法的计算结果完全一致,随着马赫数增加,一i阶精度格式的捕捉法需要进行调整限制器参数、时间步长等人工干预,但是装配法直到马赫数2O计算过程没有出现异常。该基于非结构动网格技术的激波装配方法,与传统的激波装配方法相比,能够用于复杂外形产生的非规则形状激波和非定常流动产生的运动激波,解决二阶精度有限体积法用于高马赫数飞行条件下多体分离过程的流动模拟时遇到的稳定性问题。关键词:激波装配;非结构动网格;非定常流动;高超声速中图分类号:V211.3文献标识码:Adoi:l0.7638/kqdlxxb一2014.0109Anunsteadyshock—fittingtechni
3、quebasedonunstructuredmovinggridsLiuJun,ZouDongyang,XuChunguang(SchoolofAeronauticsandAstronautics,DalianUniversityoJTechnology,Dalian116024,China)Abstract:Ashock—fittingtechniquebasedonunstructuredmovinggridsisdeveloped.BasedonArbitraryLagrangian-Eulerian(ALE)equations,DiscreteGeometricCon
4、servationLaw(DGCL)isconstructedbyadoptinganewideaformodifyingthevolume;thefieldvariablesofnewre—meshinggridsareobtainedbytheinformationtransfermethodbasedontheunstructuredmovinggridstechnique;theinitialshockpositionisdetermined15y、theflowfieldcapturedbythefirst—orderspatialschemeandtheunste
5、adyflowissuccessfullysimulatedusingshock—fittingtech—nique.Thefluid—structurecoupledprocessofhypersonicfairingseparationwhenMachnumberreaches6.0issimulatedusingtheshock—fittingandshock—capturingmethodsrespectively,andthesimulationresultsaregoodinagreement.WithMachnumberincreased,theaccuracy
6、ishardtoreachsecond—orderunlessbyadjustingthelimiterparametersortimestepartificially.Howev—er,thereisnoabnormaloccurringeveniftheMachnumberreachesto20.0whentheshock—fit—tingmethodisadopted.Comparingwiththetraditionalshock—fittingtechnique,theunsteadyshock—fittingtechniquecanbeusedtosimulate
7、theirregularshockproducedbycomplexshapesandtheI1"10vingshockwaveproducedbytheunsteadyflow,itcanalsosolvethestabilityproblemwhichmavgenerallyoccurredintheprocessofsimulatingthemulti—bodyseparationbythefinitevolumemethod(FVM).Keywords:shock—fitting;unstruc
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