the work includes several principal points as follow . a hybrid grid generation technique which couples the method of solving partial differential equations with the geometric method is applied to generate high quality structured grid for cfd calculation 主要工作包括以下幾個方面:采用求解偏微分方程和幾何法相結(jié)合的混合型網(wǎng)格生成技術(shù),開發(fā)了適用于離心葉輪機械的高質(zhì)量結(jié)構(gòu)化網(wǎng)格生成算法。
we generated its grid surface on the fuselage or missile body according to the geometry projection relation between aerodynamic components and the bilinear interpolation approach . finally, we successfully developed a new algebra grid generation technique in virtue of the improved four-boundary interpolation . in this thesis, we put emphasis on the researches of aerodynamic inverse design and drag reduction questions for airfoil and wing using euler equations and control theory proposed by jameson (2)進(jìn)行了應(yīng)用控制理論和二維歐拉方程的翼型氣動反設(shè)計,以及有升力約束情形下翼型跨音速減阻問題研究,分別推導(dǎo)了相應(yīng)的共軛方程及邊界條件的數(shù)學(xué)形式,并給出了相應(yīng)的梯度求解公式形式,研究發(fā)展了共軛方程及梯度的數(shù)值求解方法,成功進(jìn)行了多個翼型的反設(shè)計和減阻問題研究。
the main purpose of this article is to research the new method to express the spatial distribution of region population density that is an important economic element, by using the grid generation technique and the data fusion theory . the main research method is to achieve the simulation and spatial expression of the population density index with the help of computer tools 主要研究方法是借助計算機工具實現(xiàn)人口密度指標(biāo)的模擬和空間表達(dá),主要成果是在應(yīng)用國際上較為先進(jìn)的數(shù)據(jù)融合理論,在引入格網(wǎng)生成的空間數(shù)據(jù)計算和表達(dá)方法的基礎(chǔ)上,模擬生成了中國的人口密度空間分布圖。
in this paper, in order to find the approaches to reduce the drag levels and enhance the lift-drag ratio for grid fin, the aerodynamic characteristics of the grid fin are calculated with tvd finite volume scheme and wind tunnel tests . according to the complex flow field, a curve-long parameter grid generation technique is applied, and the density of the grid is processed 為適應(yīng)復(fù)雜流場的數(shù)值計算,對網(wǎng)格生成方法進(jìn)行了研究,采用弧長網(wǎng)格生成法進(jìn)行貼體網(wǎng)格生成,并對網(wǎng)格進(jìn)行了加密處理,使物面附近網(wǎng)格盡量密些,而在遠(yuǎn)場使網(wǎng)格盡量稀疏些。