桥墩壅水的数值模拟

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1、北京交通大学硕士学位论文桥墩壅水的数值模拟姓名：张念申请学位级别：硕士专业：桥梁与隧道工程指导教师：齐梅兰20080601ABSTRACTABSTRACT：Atthedesignofthebridge，thecalculationofbridgeopening,thearrangementofdiversionstructuresandthegeneralschemecomparisonareallbasedonhydrauliccomputation．Thehydrauliccomputationofbridge，exceptfornaturalstreamandunre

2、gulatedbed，isbasedontheheightofbackwater．Ⅲsisbecauseoftheapertureofpierscompresseswater,SOthevelocityofwaterincreasesandwhereclosethefloodingearthbankproducethebackwaterthatishigherthanthenormallevel．Andthedownriverwatersurfaceislowerthanthenormallevel，SObetweentheearthbanktherewillbecomin

3、ghugepressuredifference,whichwillcausedangerousattheperiodofflooding．Andthebackwaterwillstronglyaffecttheheightofearthbankandthebridgeclearance．Sotheheightofbackwaterhasveryimportantsignificance,andthisthesismakessomeresearchatthebackwater．111ethesisfirstlyreviewsbrieflythemechanismofbackw

4、aterandtheeffectfactors，andthenanalysesthefactorsthatarerelevantwiththebackwaterintheformulaeusedusuallyathomeandabroad，andmakesasummaryofdomainsandconditionsoftheadoptionoftheformulae．BecausethereiSnotauniformformulaCallbeacceptedatthepresenttime,SOitisnecessarytoanalyzethebackwaterofpier

5、susinganumericalmethod．Asthefollowing,thethesissimulatesthesituationofflowfieldandbackwateratpierswi廿1plane2Dnumericalmodule．ThethesisutilizestheFLUENTsoftwarethatisusedtocalculateliquidequationstoestablishtwodimensionalhorizontalnumericalsimulationatpiersandchoosesasetoflaboratorydatatode

6、monstratethereliabilityandrationalityofthesimulation．Theresultindicatesthatthemodulecansimulatethesituationofflowandcalculatethebackwateratthepiers．Consequently,withthechangeofdifferentfactorsaffectingtheheightofbackwater,thethesisanalysesthereasonsoftheheightnearbythepiers．Theresultconclu

7、desthatthemodulesCansimulatetheatmosphereofwaterflowandbackwateratpierswellandhavecertainutilization，andthesametime，instructthedesignofthebridgeinsomefacets．Itissignificativetothecalculationofthebackwaterofpiers．KEYWORDS：Backwaterofpiers；CompressedRiver；Numeri