查询词典 fluid dynamics

ABSTRACT Computational fluid dynamics is a combinative production of modern hydrodynamics, numerical mathematics and computer science...

计算流体动力学是近代流体力学，数值数学和计算机科学结合的产物，是一门具有强大生命力的边缘科学。

Two classes of numerical methods based on FD-WENO schemes were recommended for solving nonconservative compressible ideal fluid dynamics equations.

以求解双曲守恒律组的FD-WENO格式为基础提出了两类用于求解非守恒可压编理想流体力学方程组的数值方法。

The course begins with the basics of compressible fluid dynamics, including governing equations, thermodynamic context and characteristic parameters.

本课程从可压缩流体动力学的基础开始讲起，内容包括控制方程，热力学背景知识和特性参数。

This method can be used to calculate flow field with arbitrary irregular shapes. It also maintains the excellent characters of TVD scheme: high resolution, accurate solution in smooth region. Thus it is a good method in numerical simulation of compressible fluid dynamics.

本方法可用于计算具有任意不规则几何形状的流场，并且保持了TVD方法高分辨率，光滑区高精度的特点，是可压缩流体动力学数值计算中的好方法。

Finally, the combination usage of parallel computing and MATLAB is studied, and is utilized on the parallel computing of Finite Element and Computational Fluid Dynamics.

集群监控管理系统自动监控整个并行计算系统的运行状况，把这些状态信息和异常情况保存于数据库，并提供图形化的接口，系统管理员可以方便的查看系统的运行信息、重新定制整个系统的结构。

The flow characteristic of undershot water is analyzed on the principle of fluid dynamics, and critical condition and theoretical calculation equation of the length of continuous flow are obtained.

根据流体动力学理论对下冲水的流动特性进行分析，得到了下冲水流保持连续性的临界条件，推导了连续流长度的理论计算公式。

This paper studies the main geometrical parameter such as angle, height, width, stagger and the upper width in dentation and trapezoid flow path, firstly, uses the single-phase numerical simulation of the computational fluid dynamics technique to analyse the influence of different geometrical parameter on discharge coefficient and flow state exponent of drip emitter. Secondly, uses the two-phases numerical simulation of CFD (1% sand content ) to analyse the influence of the above mentioned geometrical parameter on the contribution regulation of sand and anti-clogging performance. Thirdly, uses the PIV （ particle Tracking Velocimetry ） technique which can see the small-scale flow path to observe and test the trajectories and velocities of solid particles in labyrinth flow path, and analyses the basic factors which can influence the movement characteristic of solid particles and the flow state in flow path.

本文以齿形流道、梯形流道为主要研究对象，以流道转角、流道高，流道宽、偏差量及梯形流道上底宽为主要结构参数，首先应用 CFD 单相流数值模拟技术对不同结构参数灌水器流道水力性能进行模拟，分析了不同结构参数对流态指数和流量系数的影响，其次，应用 CFD 两相流（含沙量为1%）数值模拟技术分析了结构参数对含沙量分布规律和抗堵塞性能的影响，然后，应用 PIV 可视化测试方法测试了固体颗粒在流道内运行轨迹及速度，分析了影响固体颗粒运动特性及流道内流体流态的基本因素，最后，对上述流道结构形式通过模具加工及滴灌带试制，进行了标准化测试（ GB/T 17187-1997 农业灌溉设备滴头技术规范和试验方法与 ISO 标准 ISO /TC23 /SC18 /WG5N4短周期堵塞测试程序），测试结果验证了 CFD 模拟结果，并提出了迷宫结构流道灌水器的抗堵塞设计方法。

The finite difference method is one important numerical method for fluid dynamics.

其中有限差分方法是一种重要的数值计算方法。

Computational fluid dynamics method was utilized to the fiowfield numerical simulation of ultrafine stirred mill, the flowfield characters(velocity gradient, shear rate dispersion of flowfield and the dissipative force of viscosity and so on) of three kinds of stirrer(disc type, stick type and spiral type) were analyzed.

利用计算流体力学方法对超细搅拌磨机进行了流场仿真数值模拟，分析了盘式、棒式、螺旋式三种搅拌器的流场特性(速度梯度、流场的剪切率分布和粘性耗散率等)。

The aerodynamics characteristic of the innovative control surfaces which are implemented on the flying wing aircraft with large aspect ratio were introduced, and elevon and split rudder were involved. And the control effects on three axis were analyzed basing on computetional fluid dynamics method. The concept of control volume was imported to introduce parameters-based method of control surfaces design. The control effect requirements of the control surfaces were also evaluated. The original design of certain aircraft's control surfaces was modified.

介绍了在该新布局飞机上采用的升降副翼和开裂式方向舵等新型操纵面的气动特点，并在计算空气动力学的基础上分析了其三轴控制效率，引进舵容量的概念提出了操纵面的参数化设计方法，基于飞机的可控性对各新型操纵面的操纵效率需求进行了评估，最终对某型飞机的操纵面初步设计进行了修正。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。