例句與造句

1. In the thesis the low drag - low noise optimization of the vehicle main form design is realized , main accomplishments are as follows . researched the knowledge of drag and flow noise , the parameters of the boundary layer are calculated by the hess - smith method and boundary layer momentum integral method . the calculation of the length of transition zone and change in boundary layer displacement thickness between laminar and turbulent states in the transition is improved , then the drag coefficient and self - noise from the transition zone are calculated as the objective functions of the optimization
   主要研究內(nèi)容和成果如下：對航行器繞流流場進(jìn)行分析，深入研究了阻力和流噪聲產(chǎn)生機(jī)理，建立了阻力系數(shù)和自噪聲的評估數(shù)值計(jì)算模型；采用物面分布源匯法和邊界層動量積分法對繞流流場的流體動力參數(shù)進(jìn)行計(jì)算，改進(jìn)了轉(zhuǎn)捩區(qū)長度和邊界層位移厚度的計(jì)算，應(yīng)用于航行器頭部駐點(diǎn)自噪聲的計(jì)算；最后設(shè)計(jì)了阻力系數(shù)和自噪聲數(shù)值計(jì)算程序模塊。
2. It's difficult to find boundary layer displacement in a sentence. 用boundary layer displacement造句挺難的