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ID:32539555
大小:7.12 MB
页数:94页
时间:2019-02-11
《引航道口门区通航水流条件的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要引航道口门区由于斜向水流的作用,横流和回流使航行船舶产生横漂和扭转,影响通航;本文采用数值计算、结合物理模型试验,对引航道口门区通航水流条件进行研究,得到如下结论:1)本文以水深平均二维水流方程理论基础,采用FEM方法对方程进行数值计算,用该数模对水槽概化模型进行数值模拟,通过计算成果与物模试验数据对比分析,得到误差在±0.05m/s以内,满足精度要求。该数学模型的特点:一是适合模拟范围长,边界条件相对复杂的河流;二是计算速度快、精度高。2)在用二维有限元方法数值模拟实际工程实验中;揭示了在不同枢纽运行工况下,下引航道口门区水流条件的特点;同时提出了改善措施。3)实验证
2、明,物理试验结果与数值计算结果基本吻合;物理模型有效的验证了该数学模型在实际工程中应用的价值,建议在宽浅河流的数值模拟中推广应用。关键词:引航道口门区;有限单元法;通航水流条件;数值模拟;物理模型试验;ABSTRACTABSTRACTThispaperstudyonnavigationinapproachchannel.whendynamicwatermeetstaticwater,therearespiralflowandspiralvortexinapproachchannel.Inthisreport,inconsultingagreatdealofdomestica
3、ndintemationalliterature,thecontentsarestudiedonthewayofnumericalcalculation,experimentalmodeltestbyanalogicalanalysingandsummarizingtheothersimilarengineeringresearchachievements.Wegetplentyofresultsbyanalyzing.Butthemainresultsinclude:1)Onthebasisofthetow—dimensionalshallowwaterequationa
4、ndthetow—dimensiondepthaveragedfiniteelementhydrodynamicnumericalmodel.Themodelcomputeshorizontalvelocitycomponentsforsubcriticalfree—surfacetow—dimensionalflowfields.TheequationaresolvedbythefiniteelementmethodusingtheGalerkinMethodofweightedresiduals.IntergrationinspaceisperformedbyGauss
5、ian.IntergrationDerivativesintimearereplacebynonlinearfinitedifferenceapproximation.ThesolvtionisfullyimplicitandthesetofsimulataneousequationissolvedbyNewton-Raphsonnonlinerinterationscheme.2)Bynumericalsimulationandexperimentalmodeltest,thispapergivesanexpositiontotheflowconditionsatentr
6、anceareaanditsinfluencetonavigation.Flood-discharginghasinfluenceonthenavigationofdownstreamapproachchannel,andespe-ciaUyobliqueflowformedinthedownstreamapproachentranceandconnectregiond—udngflood—discharginginfluencedthenavigationgreatly.Bythecharacteristicvaluesoftheobliqueflowsandcharac
7、teristicvaluesoftheshipsailinginobliqueflows,thenavi—gationflowconditionareanalyzedeffectly.Theinfluencecausedbyobliqueflowwillbereduedthroughmodifyingthenavigation.3)Bythephysicalmodelonthescaleof1:100andnumericalsimulation,variousarrangementsofdownstreamappr
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