搜索结果: 1-15 共查到“知识库 理论流体力学”相关记录22条 . 查询时间(2.85 秒)
螺控湍流压缩性研究取得进展（图）
中国科学院 力学研究所 流体力学 几何学
2022/4/26
如何从最基本的统计动力学出发控制湍流是长期以来湍流和流体力学理论中的一个基础性问题，同时对于应用基础研究有重要价值，其中对称性在物理学和力学基本理论中均具有根本性意义。近日，力学所高温气体动力学国家重点实验室杨焱副研究员与南京市高淳区速诚基础与交叉科学研究中心首席科学家朱建州博士合作，从对称性原理出发，在螺度控制湍流压缩性方面取得了进展。
Computational Fluid Dynamics and Airplane Design: Its Current and Future Impact
Computational Fluid Dynamics Airplane Design
2015/6/18
A light structure is needed to reduce W0. SFC is the province of the
engine manufacturers. The aerodynamic designer should try to maximize
VL
D
. This means the cruising speed V should be increase...
The scaling in the overlap region of turbulent wall-bounded flows has long been the source of
controversy, and until recently this controversy could not be addressed because measurements
did n...
对一维定常对流扩散方程有限元解的波动问题进行汇总和分析，讨论产生有限元解波动的原因，介绍常用的处理解波动的基本原理和技术。采用不同插值函数进行有限元分析，并与解析解对比，重点讨论了指数型插值函数有限元解的波动和收敛性。研究结果表明提高插值函数连续性可以改善一维对流扩散方程有限元数值波动情况。与线性Lagrange插值函数相比，指数型插值函数可精确给出变量在单元内的分布，并能较好地控制数值波动现象。...
Longitudinal and transverse velocity scaling exponents from merging of the Vortex filament and Multifractal models
Longitudinal and transverse velocity scaling exponents merging of the Vortex filament Multifractal models Fluid Dynamics
2012/4/20
We suggest a simple explanation of the difference between transverse and longitudinal scaling exponents observed in experiments and simulations. Based on the Vortex filament model and Multifractal con...
Joint downscale fluxes of energy and potential enstrophy in rotating stratified Boussinesq flows
Turbulent flows Boussinesq flows Joint downscale fluxes potential enstrophy
2011/8/11
Abstract: We employ a coarse-graining approach to analyze nonlinear cascades in Boussinesq flows using high-resolution simulation data. We derive budgets which resolve the evolution of energy and pote...
The flow of charm is calculated in 2+1 ideal hydrodynamics by introducing the charge of $c\bar{c}$ pair assuming that the number of $c\bar{c}$ pairs is conserved in relativistic heavy-ion collisions. ...
磁流体压缩管道热电磁流动特性研究
磁流体旁路超燃冲压发动机 磁流体发生器 压缩管道 数值模拟 熵条件格式
2014/5/22
利用磁流体五波模型对低磁雷诺数下压缩管道中磁流体流动进行数值模拟。该模型由带有电磁作用强制项的Navier-Stokes方程组与电势Poisson方程组成,数值格式分别采用严格保证熵条件的熵条件格式和中心差分格式。数值模拟对不同磁作用数下的不同几何外形管道进行数值模拟研究,结果表明在磁流体压缩管道中,由于发生器模式提取能量的影响,使得管道马赫数和总焓均下降,而流动在电极壁面上发生了分离。在中心流动...
微流体装置中超声流的研究
微流体 声流速度 ANSYS 驱动力
2014/5/15
首先应用流体动力学的基本理论，建立起声流场的一维解析模型，对声波在管道内部传播时产生的声场和声流运动进行探讨。然后提出并设计了一种利用PZT激励微管道振动产生超声场的新型微流体装置。该装置为由微管道相连接的两个微腔体，并利用有限元法对超声波激励的微管道和腔体进行瞬态的流场数值分析，得到一阶声压和流场的速度分布结果，最后对数值结果进行处理并讨论了超声波在管道内传播时产生的声流速度以及驱动力的分布情况...
为了解水平温度梯度作用下环形腔内双层薄液层热毛细对流的基本特性，采用渐近线方法 获得了热毛细对流的近似解. 环形腔外壁被加热，内壁被冷却，上、下壁面绝热. 结果表明， 当环形腔宽度与内半径比趋于零时，环形腔退化为矩形腔，所得到的主流区速度场和温度场 的表达式演化为Nepomnyashchy 等得到的矩形腔内的结果；与数值模拟结果的比较 发现，在主流区渐近解与数值解吻合较好.
A LATTICE BOLTZMANN COUPLED TO FINITE VOLUMES METHOD FOR SOLVING PHASE CHANGE PROBLEMS
lattice Boltzmann computational fluid dynamics phase-change
2009/10/14
A numerical scheme coupling lattice Boltzmann and finite volumes approaches has been developed and qualified for test cases of phase change problems. In this work, the coupled partial differential equ...
FLOW BOILING HEAT TRANSFER COEFFICIENT OF R-134A/R-290/R-600A MIXTURE IN A SMOOTH HORIZONTAL TUBE
heat transfer coefficient stratified flow acetone
2009/10/14
An investigation on in-tube flow boiling heat transfer of R-134a/R-290/R-600a (91%/4.068%/4.932% by mass) refrigerant mixture has been carried out in a varied heat flux condition using a tube-in-tube ...
THERMAL AND HYDRODYNAMIC CHARACTERISTICS OF FORCED AND MIXED CONVECTION FLOW THROUGH VERTICAL RECTANGULAR CHANNELS
mixed convection rectangular channels turbulent flow
2009/10/14
This paper presents experimental and numerical studies for the case of turbulent forced and mixed convection flow of water through narrow vertical rectangular channel. The channel is composed of two p...
FLUID BOUNDARIES SHAPING USING THE METHOD OF KINETIC BALANCE
kinetic balance method fluid flow optimal geometry
2009/10/13
Fluid flow in curved channels with various cross sections, as a common problem in theoretical and applied fluid mechanics, is a very complex and quite undiscovered phenomenon. Defining the optimum sha...
CONSTRUCTAL THEORY AND FLOW ARCHITECTURES IN LIVING SYSTEMS
flow architectures living systems constructal theory
2009/10/13
We apply Constructal theory to the study of the flow structure of the human respiratory tree. We show that the flow architecture that would perform oxygenation of the blood and removal of carbon dioxi...