In this paper, a three-dimensional multi-level hydrodynamic model with curvature correction in curvilinear coordinates has been developed based on the update turbulent theory and numerical method, which can effectively solve the practical problems of flows and water quality transportations in hydraulic engineering, and can strengthen the practical usage of the mathematical model.

本文基于現(xiàn)代紊流理論人人做人人干、現(xiàn)代數(shù)值計(jì)算方法建立適合描述水利工程中紊流規(guī)律的非線性數(shù)值模型，即曲線坐標(biāo)系下的多層紊流水動(dòng)力模型北京免费毛片，旨在提高紊流精細(xì)模擬的實(shí)用性中文字幕在线更新资源站，以求有效地解決水利工程中的水流和輸運(yùn)現(xiàn)象的實(shí)際問(wèn)題欧洲性爱一级二级网站视频。

Main creative points of the thesis are as following:1. It is the first time to apply 2-D and 3-D turbulent model of the air-water two phases flow to the study on hydraulic properties of groyne. It makes description of the turbulent flow field to be possible precisely. This offers a more accurate method to determine the water surface in channel improvement.2. Based on the results of experiment and simulation for 3-D turbulent model of air-water two phases flow, a new formula to compute the height of damming is built.3. Based on the 2-D mode and the formula to compute the height of damming, the subdivision method of 2-D computation for water surface at upstream and downstream.

本文的創(chuàng)新工作主要是：首次將三維水氣兩相流紊流數(shù)學(xué)模型應(yīng)用于丁壩水動(dòng)力學(xué)特性研究A片、Com，使丁壩附近流場(chǎng)和紊動(dòng)場(chǎng)的精細(xì)描述成為可能，為航道整治中水面線確定提供了一個(gè)更為準(zhǔn)確的方法极品99久久久国产精品；(2)基于水槽實(shí)驗(yàn)和三維水氣兩相流紊流數(shù)學(xué)模型數(shù)值模擬結(jié)果男生女生的www，建立了新的丁壩前奎水高度計(jì)算公式；(3)基于上述奎水高度計(jì)算公式和本文二維水面計(jì)算數(shù)學(xué)模型欧美一级毛多水多的肥婆，首次提出了丁壩上下游二維水面分段計(jì)算方法全色A一级A片。

In this thesis, study is on the basis of N-S equation and standard turbulent flow mould. Numerical simulation is given to turbulent flow inside impeller of LB50-160 type centrifugal pump.

本文基于N-S方程和標(biāo)準(zhǔn)k-ε紊流模型，對(duì)LB50-160型離心泵設(shè)計(jì)流量下葉輪內(nèi)流場(chǎng)三維紊流進(jìn)行了數(shù)值計(jì)算自拍偷拍三区，獲得了葉輪內(nèi)流場(chǎng)的速度天天插天天狠天天透、壓力分布，捕捉到了一些重要的流動(dòng)現(xiàn)象欧美性黄视频。

Numerical simulation to three-dimensional turbulent flow in multistage axial compressor blade row is carried out, where high resolution third-order ENN scheme is adopted to catch the shockwave and simulate the turbulent flow correctly, and LU-SGS implicit method is chosen to improve computation rate. A nicety and high efficiency numerical simulating system is thus constructed.

對(duì)多級(jí)軸流壓氣機(jī)葉柵內(nèi)三維紊流流場(chǎng)進(jìn)行數(shù)值模擬一级a在线，采用高精度高分辨率的三階ENN格式以保證對(duì)激波的捕捉和對(duì)紊流特征的正確模擬免费污视频一区在线，利用LU-SGS隱式解法提高了計(jì)算速度，從而構(gòu)成了一種既準(zhǔn)確又高效的多級(jí)跨聲速軸流壓氣機(jī)紊流流動(dòng)數(shù)值求解系統(tǒng)在线视频久。

Considering the characters of the viscoidal turbulent flow over high-speed train,the computing model of the outer fiow field for high-speed train has beenestablished based on the incompressible fluid Navier-StOkes epuation and theturbulent model of ke two equations. The equation set of the flow field problemvia finite element methods has been set up.

根據(jù)高速列車(chē)粘性紊態(tài)繞流的特點(diǎn)黄色电影你懂的，在較少簡(jiǎn)化的條件下以Navier-Stokes方程和κ-ε兩方程紊流模型為基礎(chǔ)，建立了高速列車(chē)外流場(chǎng)的計(jì)算模型先锋自拍日韩视频，在近壁區(qū)域采用壁面函數(shù)修正紊流模型wwwww看亚洲。

The results of this study indicate that changing the angle of the intake port has a profound effect on the flow field during the intake stroke of the engine cycle. For the case with the intake-exhaust valves canted at zero degree (the so-called vertical valves), the tumble ratio, swirl ratio, turbulent intensity, and turbulent kinetic energy in the direction perpendicular to the bisecting plane of the cylinder are at their highest levels than those obtained for the other cases. This effect is most pronounced after the compression stroke of the cycle. As a result of this study, it is observed that the behavior of the overall flow field from the intake to the completion of compression stroke has a major impact on the effectiveness of the mixing of fuel-air prior to the ignition of the engine cycle.

結(jié)果顯示，改變進(jìn)排氣閥的傾斜角度對(duì)進(jìn)氣期間的流場(chǎng)變化有很明顯的影響50岁国产肥女人精品区，其中以垂直閥(進(jìn)排氣閥傾斜0度)所得的 Y軸向(Y方向系垂直於將汽缸對(duì)分為二平面的方向)滾流強(qiáng)度福利片国产馆、渦漩比、紊流強(qiáng)度影音先锋黄色9001、紊流動(dòng)能等流場(chǎng)強(qiáng)度為最強(qiáng)一级a毛片永久免费观看网站；若以流體經(jīng)活塞壓縮后的流場(chǎng)特性進(jìn)行探討，所得結(jié)果顯示壓縮沖程對(duì)汽缸內(nèi)流場(chǎng)的效應(yīng)是不容忽視的狼友绿色网站；因此由進(jìn)氣到壓縮過(guò)程結(jié)束的整體流場(chǎng)現(xiàn)象久久久久国产99久久国产，才是影響引擎點(diǎn)火前的油氣混合程度與燃燒品質(zhì)的關(guān)鍵。

In our research, a 3-D numerical simulation calculation of the outside flow field of the flat-headed van-body truck has been made first. A RNG k-? turbulence model which can increase the calculation precision of the separation flow has been adopted, and the results show that the calculation of the van-body truck with the RNG k-e turbulence model is more exact than that of the standard k-e turbulence model.

本研究首次對(duì)平頭廂式貨車(chē)外部流場(chǎng)進(jìn)行了三維數(shù)值模擬計(jì)算思思热99在线视频，模擬采用可以提高分離流計(jì)算精度的RNG k-ε紊流模型亚洲国产福利精品网站，計(jì)算結(jié)果表明其計(jì)算精度較標(biāo)準(zhǔn)k-ε紊流模型有顯著的提高。

PDA(particle dynamics analyzer system) was used to measure the flow velocity of particles in the XFD-12 flotation cell, the results show that tangential mean velocity in the radial direction changes from positive to negative in the flotation cell, naught point emerge in the medium of the radial direction ,it is where backward fluid emerge ,shear stress of backward fluid induce the particle detachment from bubbles .

汁算數(shù)據(jù)與實(shí)際礦石篩析結(jié)果都表明看黄一区二区，紊流強(qiáng)度增大无吗黄片免费视频，泡沫中粗粒級(jí)含量減小。 4黄视频免费。用PDA在XFD-12型8L浮選機(jī)中測(cè)定的速度值第一页国产屁屁影院，進(jìn)行混合區(qū)、分離區(qū)草久免费、泡沫區(qū)紊流運(yùn)動(dòng)功率譜計(jì)算91国在线精品视频，得紊流脈動(dòng)頻率，混合區(qū)小于20Hz老熟妇性交免费视频，分離區(qū)在20-30Hz之間精品视频在线观看日韩AV，泡沫區(qū)在25-35Hz之間，浮選槽內(nèi)紊流脈動(dòng)以低頻為主国产福利导航视频，且紊流脈動(dòng)動(dòng)能是混合區(qū)大于分離區(qū)大于泡沫區(qū)欧美国产日韩在线综合。

An advanced combined turbulent lubrication model is proposed: low turbulence Reynolds number k-e model is used to describe the flow in the near-wall regions, and algebraic Reynolds stress model is used to describe the flow in the turbulence kernel, with flow continuity kept between the two models and transition criterion set to fit Leutheusser's measurements.

提出了先進(jìn)的復(fù)合型紊流潤(rùn)滑理論：以低紊流雷諾數(shù)k-e模式描述近壁區(qū)內(nèi)的流場(chǎng)，而以代數(shù)雷諾應(yīng)力模式描述紊流核心區(qū)內(nèi)的流場(chǎng)亚洲各国三级片网站，二區(qū)間流場(chǎng)連續(xù)過(guò)渡A片一A片一A片一a片，并依據(jù)Leutheusser實(shí)驗(yàn)結(jié)果設(shè)定過(guò)渡準(zhǔn)則。

The previous researches have been done experiments mostly in the Water tank. In order to simulate turbulence of flow in river and research its characteristics, the characteristics of turbulence are studied by experiments in the water channel with ADV technique. The research results indicate that R.M.S. velocity linearly relates to the oscillating-grid frequency; R.M.S. velocity decays by power exponent relates to the distance from the grid midplane; and the relationship between the geometrical factors and the free movement space of water is direct proportion.

以往研究大都在水箱中對(duì)振動(dòng)格柵紊流特性進(jìn)行實(shí)驗(yàn)研究欧美性aa，為能模擬天然河道中的紊流插入阴道一出一入视频，研究天然河道中紊流特性男生女生黄色网站视频，利用ADV技術(shù)在水槽中對(duì)振動(dòng)格柵紊流進(jìn)行了實(shí)驗(yàn)研究研究結(jié)果表明：均方根速度與格柵振動(dòng)頻率成線性關(guān)系；均方根速度與距格柵中平面的距離成冪指數(shù)關(guān)系衰減www久草；幾何系數(shù)與水的自由運(yùn)動(dòng)空間成正比關(guān)系亚洲欧美大码a在线观看。

turbulent buffeting：紊流抖振

turbulent atmosphere 紊流大氣 | turbulent buffeting 紊流抖振 | turbulent burner 紊流煤粉燃燒器=>渦巻バーナ

turbulent diffusion process：紊流擴(kuò)散過(guò)程

turbulent diffusion 紊流擴(kuò)散,渦流擴(kuò)散,湍流擴(kuò)散 | turbulent diffusion process 紊流擴(kuò)散過(guò)程 | turbulent diode 紊流二極管

eddying：湍流(的);紊流的;渦流的

eddyviscosity湍流粘度 | eddying湍流(的);紊流的;渦流的 | eddyingfiow渦流(流動(dòng));紊流;湍流

eddying fiow：渦流(流動(dòng));紊流;湍流

eddying 湍流(的);紊流的;渦流的 | eddying fiow 渦流(流動(dòng));紊流;湍流 | edema 水腫;浮腫

turbulent shear force：紊流剪力

紊流施密特?cái)?shù) turbulent Schmidt number | 紊流剪力 turbulent shear force | 湍性[沖]擊波 turbulent shock

homogeneous turbulence：均勻紊流,均勻紊流

homogeneous tube 整個(gè)管,整管 | homogeneous turbulence 均勻紊流,均勻紊流 | homogeneous X-ray 單色X射線

turbulent separation：紊流分離

turbulent resistance 擾流阻力,紊流阻力 | turbulent separation 紊流分離 | turbulent stress 紊流應(yīng)力

turbulent flame：紊流燄

turbulent boundary layer separation 紊流邊界層分離 | turbulent flame 紊流燄 | turbulent flame speed 紊流火焰速率

turbulent wake：擾流尾流,紊流尾流

turbulent stress 紊流應(yīng)力 | turbulent wake 擾流尾流,紊流尾流 | turn and bank (slip) indicator 轉(zhuǎn)彎傾斜(側(cè)滑)儀

turbulence flow flied：紊流流場(chǎng)

紊流劑 turbulent inducing agent | 紊流流場(chǎng) turbulence flow flied | 紊流脈動(dòng) turbulent fluctuation