esults,paredwiththepastknowledgetofindouttheuniversalandessentialconcept,thatis,frontier,whichishidedinthefluidmechanicsstudies.Ontheotherhand,intheanalysesonthefluidparticle’smovement,positiontheoremcouldnotbedirectlyinterpretedinthepastinvestigation.Thebreakthroughistheintroductionofthetransversewaveandthelongitudinalwavewhichareneglectedforaverylongtimeinthefluidmechanics.Thetransversewaveparadoxisadvancedandtherelationshipbetweenthetransversewaveandtheviscosityofthefluidisanalyzed,pressibilityofthefluid.Finally,theFrontierLongitudinalTransverseTheoryisbuiltupbasedontheconceptsofthefrontier,thetransversewaveandthelongitudinalwave,andisusedtoprimarilydiscusstheexistenceoftheboundarylayer.Keywordsvorticity;velocitygradienttensor;transversewave;viscosity;pressibility;frontier;boundarylayer
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