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?jī)?nèi)容和成果如下：對(duì)航行器繞流流場(chǎng)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(píng)估數(shù)值計(jì)算模型；采用物面分布源匯法和邊界層動(dòng)量積分法對(duì)繞流流場(chǎng)的流體動(dòng)力參數(shù)進(jìn)行計(jì)算，改進(jìn)了轉(zhuǎn)捩區(qū)長(zhǎng)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. In order to predict hydrodynamic characteristics a computational system is developed including determination of the pressure distribution on a wing section by use of the conformal mapping method and panel method respectively and of the flow in boundary layer according to the thin shear layer approximation ( tsl ) for navier - stokes equation approach . the wing sections of naca4412 and naca0012 are applied to test the computational system . the numerical inspection shows that the panel method with better precision and the momentum and the displacement thickness of boundary layer can be used to complete this calculation
   本文分別用守屋的保角變換法和基于源匯渦分布的面元法，建立了計(jì)算槳葉表面壓力分布的數(shù)學(xué)模型；應(yīng)用納維-斯托克方程的薄層近似理論模式和有限差分?jǐn)?shù)值方法，建立了計(jì)算機(jī)翼表面邊界層內(nèi)部流動(dòng)的數(shù)學(xué)模型；應(yīng)用槳葉表面邊界層內(nèi)部粘性流動(dòng)和外部勢(shì)流流動(dòng)在邊界上的匹配算法，建立了槳葉表面二相流流動(dòng)的計(jì)算方法和相應(yīng)的計(jì)算機(jī)程序。
3. It's difficult to find displacement thickness in a sentence. 用displacement thickness造句挺難的