搜索结果: 1-15 共查到“工学 Lagrangian”相关记录18条 . 查询时间(0.14 秒)
Sparse unmixing via variable splitting and augmented Lagrangian for vegetation and urban area classification using Landsat data
Sparse regression spectral unmixing Landsat abundance estimation spectral libraries endmember
2015/7/27
In this paper, we explore the possibility of sparse regression, a new direction in unmixing, for vegetation and urban area classification. SUnSAL (Sparse unmixing via variable splitting and augmented ...
Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics
Coastal and Ocean Dynamics Lagrangian Analysis
2015/7/20
During a colloquium on Lagrangian dynamics in Liège, Belgium, in 1999, several participants discussed convening a meeting devoted to Lagrangian studies in the ocean and atmosphere. The European Scienc...
Lagrangian transport pathways in the northeast Atlantic and their environmental impact
drifting, rafting, connectivity, pollutant and larval transport, water masses
2014/4/1
This study focused on mapping the general transport pathways of the northeast Atlantic Ocean by using
the Regional Oceanic Modeling System to calculate ocean current velocity components (u, v, w), an...
Lagrangian formulation of turbulent premixed combustion
Lagrangian formulation turbulent premixed
2011/9/15
The Lagrangian point of view is adopted to study turbulent premixed combustion. The evolution of the volume fraction of combustion products is established by the Reynolds transport theorem. It emerges...
Transport Induced by Mean-Eddy Interaction: I. Theory, and Relation to Lagrangian Lobe Dynamics
Eulerian Transport Lagrangian Transport Mean-Eddy Interaction Dynamical Systems Approach Wind-Driven Ocean Circulation
2011/8/11
Abstract: In this paper we develop a method for the estimation of {\bf T}ransport {\bf I}nduced by the {\bf M}ean-{\bf E}ddy interaction (TIME) in two-dimensional unsteady flows. The method is built o...
Ghost-Fluid Eulerian-Lagrangian方法及其应用
level set GEL算法 流固耦合 爆炸容器
2010/12/21
考察了将独立的Euler程序和Lagrange程序通过Ghost Fluid方法结合起来以处理流固耦合问题的算法。在Euler计算步中，采用基于物质界面建立的Level set函数对被Lagrange域覆盖的Euler网格上的物理量进行外插，同时确保界面两侧压力和法向速度连续；而在Lagrange计算步中，根据界面所在Euler网格压力确定界面各个节点的受力情况，从而确定Lagrange单元的运动...
基于level set的Eulerian-Lagrangian耦合方法及其应用
大变形流体力学问题 多介质 Eulerian-Lagrangian耦合方法 水平集方法 近似Riemann解
2014/3/10
提出了一种基于水平集的Eulerian-Lagrangian耦合方法，其中Lagrangian方法采 用相容显式有限元拉氏方法，Eulerian方法采用基于近似Riemann解的有限体 积Eulerian方法，多介质界面处理采用新的水平集和Ghost方法计算. 给出了若干 数值算例，包括激波管问题以及金属和气体的运动界面及其大变形问题，并分别与 精确解和相容显式有限元拉氏方法的计算结果进行了对比....
Non-Linear Dynamic Analysis of Arch Dams: Eulerian and Lagrangian Solutions
Fluid-structure interaction Eulerian approach Lagrangian approach Drucker-Prager yield criterion
2009/10/13
In this study, Eulerian and Lagrangian finite element formulations are given for the dynamic interaction problem of a fluid-structure system. Non-linear dynamic analyses of Karakaya arch dam were perf...
Investigation of Hydrodynamic Effects on Linear and Nonlinear Earthquake Responses of Arch Dams by the Lagrangian Approach
Hydrodynamic effect Dam-water-foundation interaction Linear and nonlinear analysis
2009/10/12
The linear and nonlinear responses of a selected arch dam subjected to earthquake ground motion are presented in this study. The hydrodynamic e ects on the dynamic response of arch dams are investigat...
Atmospheric Transport Modeling with 3D Lagrangian Dispersion Codes Compared with SF6 Tracer Experiments at Regional Scale
Atmospheric Transport 3D Lagrangian Dispersion Codes
2009/9/3
The results of four gas tracer experiments of atmospheric dispersion on a regional scale are used for the benchmarking of two atmospheric dispersion modeling codes, MINERVE-SPRAY (CEA), and NOSTRADAMU...
Numerical Simulation of Dynamic Response of Structure Caused by Impact Pressure Using an Eulerian Scheme with Lagrangian Particles
Dynamic Response Eulerian Scheme Lagrangian Particles
2009/4/2
We have developed a new numerical scheme that combines a Eulerian scheme with Lagrangian particles to compute fluid-structure interaction caused by impact pressure. The proposed numerical model was ap...
采用计算流体力学和离散单元方法耦合模型（CFD-DEM）对二维下行床内的气粒流动行为进行了全床数值模拟。模拟结果展示了下行床典型操作条件下特有的气固动态流动结构：沿流动方向存在明显的入口控制区、过渡区和（完全）发展区;颗粒聚团并不是出现在浓度相对较高的入口区，而是在过渡区之后的发展过程中逐渐形成较多的、松散的动态聚团结构。下行床发展段呈现典型的近壁浓环结构，这与实验结果基本一致。考察了颗粒之间以及...
用Lagrangian松弛法解化工批处理调度问题
Lagrangian松弛法 化工批处理过程 调度
2008/12/5
研究基于Lagrangian松弛法的化工批处理过程的调度方法.建立了化工批处理过
程调度问题的一种混合整数规划(MILP)模型,并通过松弛离散变量和连续变量共存的约束,
将问题分解为一个两层次的优化问题,其中上层是原问题的对偶问题,下层由两个子问题构
成:一个与产品批量有关,另一个确定操作时间表,分别用线性规划和动态规划方法解这两个
子问题.然后从对偶问题的解构作原问题的可行解.数值试验结...
实心轮胎动接触问题是轮胎力学领域里的新课题，本文提出了Lagrangian乘子与对称罚函数法的结合算法，并以某履带车辆实心轮胎为例，应用该方法对其进行了动接触的有限元力学分析，获得了实心轮胎稳态滚动的应力场及接触变形情况。有限元计算结果表明该算法可以有效分析实心轮胎的动接触问题，而且对其结构优化、材料选择以及疲劳寿命预估等研究都具有一定的指导意义。
分区Lagrangian涡方法及瞬时起动圆柱初期流动的模拟
Lagrangian涡方法 分区处理 分离流
2007/7/28
摘要本文提出一种分区Lagrangian涡方法:将附着流动和分离流动分开处理,在附着区解边界层方层,只在分离区用涡方法解N-S方程。由于将尺度不同的区域分开了,求解分离区流动的涡方法中,每一时间步上物面引出的涡数在较小程度上依赖于Re数。这样,求解高Re数流动时,流场内的涡数,因而计算机内存和时间得以大大减小。用该方法计算了瞬时起动圆柱的初期流动,与实验结果比较相符很好。
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