基于非結(jié)構(gòu)動網(wǎng)格的非定常激波裝配法.pdf

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1、第33卷第1期空氣動力學(xué)學(xué)報(bào)Vo1．33。No．12015年O2月ACTAAERoDYNAMICASINICAFeb．，2015文章編號：0258—1825(2015)01—001007基于非結(jié)構(gòu)動網(wǎng)格的非定常激波裝配法劉君，鄒東陽，徐春光(大連理工大學(xué)航空航天學(xué)院，遼寧大連116024)摘要：從ALE方程出發(fā)，通過修正體積的新思路構(gòu)建離散幾何守恒律，基于非結(jié)構(gòu)動網(wǎng)格的信息傳遞方法得到網(wǎng)格重構(gòu)以后新網(wǎng)格的流場參數(shù)，采用一階格式捕捉法得到的流場確定裝配法的初始激波位置，成功地把激波裝配法應(yīng)用到非定常流動的模擬。模擬超聲速飛行環(huán)境下整流罩分離的非定常流固耦合過程，在馬赫數(shù)6條件下

2、裝配法和捕捉法的計(jì)算結(jié)果完全一致，隨著馬赫數(shù)增加，一i階精度格式的捕捉法需要進(jìn)行調(diào)整限制器參數(shù)、時間步長等人工干預(yù)，但是裝配法直到馬赫數(shù)2O計(jì)算過程沒有出現(xiàn)異常。該基于非結(jié)構(gòu)動網(wǎng)格技術(shù)的激波裝配方法，與傳統(tǒng)的激波裝配方法相比，能夠用于復(fù)雜外形產(chǎn)生的非規(guī)則形狀激波和非定常流動產(chǎn)生的運(yùn)動激波，解決二階精度有限體積法用于高馬赫數(shù)飛行條件下多體分離過程的流動模擬時遇到的穩(wěn)定性問題。關(guān)鍵詞：激波裝配；非結(jié)構(gòu)動網(wǎng)格；非定常流動；高超聲速中圖分類號：V211．3文獻(xiàn)標(biāo)識碼：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