Page 153 - 《水资源与水工程学报》2024年第2期
P. 153
!35 "!2 # & ' ( ) & * + , - Vol.35No.2
2024 $ 4 % JournalofWaterResources&WaterEngineering Apr.,2024
DOI:10.11705/j.issn.1672-643X.2024.02.17
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GHIJK:TV147 LMNOP:A LQRK:1672643X(2024)020149010
Simulationontheinteractionsbetweenbedmorphologyand
waterflowbasedonthelargeeddymodel
1
2
3
1
LIUXun,ZONGQuanli,LIUZhenji,SUJun
(1.CollegeofWaterConservancyandArchitecturalEngineering,ShiheziUniversity,Shihezi832000,China;2.Schoolof
ResourcesandEnvironment ,QingdaoAgriculturalUniversity,Qingdao266109,China;3.ShiheziWater
ConservancyEngineeringManagementServiceCenter ,Shihezi832000,China)
Abstract:Toinvestigatethemodelsimulationaccuracyofsecondaryflowandeddystructureindynamic
bedbends,thesimulationaccuracyofbedmorphologyduringscouringandsiltationprocessinbendsby
thelargeeddymodel (LES)andtheRNGk-ε modelwasverifiedbythescourflumeexperimentsofa
90°horizontalbendbyBarbhuiya,andtheresultsoftheLESmodelwerefoundtobemoreaccurate.
BasedonthesimulationresultsoftheLESmodel ,thebottomvortexstructuregeneratedbysecondaryflow
wasidentifiedbytheQcriterion,accordingtowhichthequantitativeeffectofvortexstructureonbed
scouringandsiltationwasanalyzed.Theresultsshowthatintheprocessofclearwaterscouringthedy
namicbedbend,thebottomvortextendstobestablewhentheQvalueisbetween30-50,andbecomes
strongenoughtoaffectthebedscouringandsiltationwhen Q >50,becauseastrongandstablevortex
structurecanstabilizethebedmorphology ,leadingtoaconstantbedscouringandsiltationrate,which
-6
changeswithin2×10 m/s.Accordingtotheanalysisoftherelationshipbetweentheshearflowvelocity
inthebendandthebedmorphology,therearetwotypesofhighshearflowvelocityareasinthebend,
whentheshearvelocityvalueofthefirsttypeareaislargerthanthatofthesecondtype,obviousscouring
pitswithadepthgreaterthan0.10mwillappearonthebedsurface.Theresultsofthisstudycanbe
usedasareferenceforthesimulationofsiltationequilibriumandbedmorphologyinthebends.
Keywords:largeeddymodel;bendmodel;bedmorphology;dynamicbedsimulation;RNGk- ε model
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