简介:Athree-dimensionalcloud-scalemodelhasbeendesigned.Thegoverningequationsofthemodelarecomposedoftwogroupsofequations:onegroupincludescompressiblemotionequations,continuityequation,pressureequationandthermodynamicequation,whichareofEuleriantype,andtheotherconsistsofcloud-precipitationmicrophysicsequationswhichareofLagrangiantype.Sincethedegreeofinfluenceofsoundwaveontheairmotionisquitedifferentfromthatonthetemperatureorhydrometeors,thetimesplittingprocedureisusedinsolvinggoverningequations.Bothunstaggeredandstaggeredmesheshavebeenutilized.Integra-tionschemesadoptedaretheEulerianbackwarddifferencemethodfortheunstaggeredmeshandsemi-implicitmethodforstaggeredmesh.Severalexperimentsofmodellinghavebeenconductedandareasonablethree-dimensionalimageofdeepconvectionisobtained.Withthismodelthehorizontalandverticalvortexcircula-tionsaresimulated.Furthermore,theeffectsofhorizontalvortexontheformationanddevelopmentofdowndraftwithincloudhavealsobeenstudied.
简介:Theclassicalpowerlawnon-Newtonianfluidsenergyboundarylayerequationisprovedimpropertodescribetheself-similarheattransfer.Atheoreticalanalysisformomentumandenergyboundarylayertransferbehaviorismadeandthefullsimilarityheatboundarylayerequationisdeveloped,whichmaybecharacterizedbyapowerlawrelationshipbetweenshearstressandvelocitygradientwiththeFalkner-Skanequationasaspecialcase.Bothanalyticalandnumericalsolutionsarepresentedformomentumandenergyboundarylayerequationsbyusingthesimilaritytransformationandshootingtechniqueandtheassociatedtransfercharacteristicsarediscussed.
简介:ImpactsongrowthofyoungtreesofPinusKoraiensisof6environmentalfactorsofintensityofsunlight,directsunlight,thicknessofsoilhumus,neighboringtrees,uppercanopyspecies,herbsandshrubswereinvestigatedonyoungtreeofPinusKoraiensisand4neighboringtreeswhichareconsideredthestructuralunitofthemicroenvironment.Resultsindicatedthatthe6environmentalfactorsunderinvestigationhadeffects,tovariousextents,ongrowthoftheyoungtrees.Basedonthefindings,suitablegrowingconditionsforregeneratedyoungtreeofPinusKoraiensisunderforestwereidentifiedandcorrespondingsilviculturalmeasureswereproposedforoperationalpractice.