冰底形态对流场特性影响的数值模拟研究的中期报告.docx

冰底形态对流场特性影响的数值模拟研究的中期报告
摘要：
本文运用流体力学数值模拟方法，对冰底形态对冰面下流场特性的影响进行了研究。首先对冰川底部三种不同形态进行了建模分析，分别为平坦底面、隆起底面和凹陷底面。然后针对这三种底面形态进行了流场模拟，并对比分析了它们的特点。
模拟结果表明，平坦底面下的流场特性较为复杂，存在较大的湍流抵抗、积聚和耗能现象；隆起底面对流场的影响较小，流速较慢，流线比较平直；凹陷底面会形成流痕，流速较快，湍流较强，存在流向分离和极限层等现象。另外，分析了不同雷诺数下冰底形态对流场特性的影响，并讨论了对流场与热传输的影响。
关键词：冰底形态，流体力学数值模拟，雷诺数，流线，湍流
Abstract:
Inthisstudy,theimpactoficebottomtopographyontheflowcharacteristicsbelowtheicesurfacewasinvestigatedusingcomputationalfluiddynamics.Threedifferentformsofglacierbedweremodeledandanalyzed,namelyflatbed,protrudingbed,andconcavebed.Subsequently,theflowcharacteristicsweresimulatedandanalyzedforthesethreebottomforms.
Thesimulationresultsshowedthattheflowcharacteristicsundertheflatbottomweremorecomplicated,withsignificantturbulentresistance,accumulation,andenergydissipationphenomenon.Theprotrudingbottomhadlittleeffectontheflowfield,withslowerflowratesandrelativelystraightstreamlines.Theconcavebottomhadasignificanteffectofflowstreaks,fasterflowrates,strongerturbulence,andexistenceofflowseparationandboundarylayers.Inaddition,theeffectoficebottomtopographyonflowcharacteristicsandthermaltransferwasdiscussedbyanalyzingtheinfluenceofdifferentReynoldsnumbersontheflow.
Keywords:icebottomtopography,numericalsimulationoffluidmechanics,Reynoldsnumber,streamline,turbulence