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AIR/W2016——空气流动分析软件

AIR/W是一个用于分析类似岩石和土壤这样的多孔材料中地下水-空气相互作用的有限元软件产品。它全面简洁的表达使用户可以分析从简单的、饱和稳态问题到复杂的、饱和-非饱和时变问题。AIR/W被广泛应用于岩土工程、土木工程、地质学、采矿工程等多个学科问题的分析和设计。

AIR/W的特点:
1.分析类型包括:剖面图或平面图中的稳态受限和自由流动,瞬变流动,2-D流动以及3D轴对称流动。
2.边界条件类型包括:总压头、压位差或者将不稳状态指定为常数或者为岁时间变化的函数;以计算水头为变量的瞬时流量函数;渗流面状况的调整和显示等。
3.测定水量体积和渗透函数可以由基本参数和粒径函数来估计。
4.采用适应的时间步长以确保证瞬态分析中在边界条件突变时的时间步长为最佳的时间步长。
5.描绘流程图。

操作简便
AIR/W软件中类似于CAD的独特处理工艺,允许用户通过在屏幕上画计算区域来生成有限元网格。用户还可以交互式的输入边界条件和材料属性。用户甚至可以用简单的参数变量如颗粒尺寸、渗透系数、饱和含水率和入口空气值等来判断材料特性函数。如果出现了错误,也只需要用Undo命令来进行改正。

典型应用
AIR/W几乎可以模拟所有的地下水问题,包括:
土壤水蒸汽预测系统
在隧道支撑和地下水流入过程控制的空气压力等问题
河岸水渗透影响下的空气压力变化问题
热量/密度随着空气流动热传在冻结/融化土壤中
基质吸力现象

AIR/W is a finite element software product for analyzing groundwater-air interaction problems within porous materials such as soil and rock. Its comprehensive formulation allows you to consider analyses ranging from simple, saturated steady-state problems to sophisticated, saturated-unsaturated time-dependent problems. You can apply AIR/W to the analysis and design of geotechnical, civil, hydrogeological, and mining engineering projects.

AIR/W can be applied to both saturated and unsaturated zones, a feature that greatly broadens the range of problems that can be analyzed. In addition to traditional steady-state water flow assumptions where the air contents are fixed, the saturated/unsaturated formulation of AIR/W makes it possible to analyze air flow and seepage as a function of time and to consider such processes as changing air and water contents. When linked with TEMP/W, it can account for air and water flow in freezing and thawing soils where the air density changes due to temperature changes.

Features
Analysis types include steady-state confined and unconfined flow, transient flow, 2-D flow in a cross-section or in plan view, and 3D axisymmetric flow.
Boundary condition types include total head, pressure head, or flux specified as a constant or a function of time; pressure head; transient flux as a function of computed head; review and adjustment of seepage face conditions.
Volumetric water content and conductivity functions can be estimated from basic parameters and grain-size functions.
Adaptive time stepping to ensure the use of optimal time steps in transient analyses with sudden changes in boundary conditions.
Flow path deliniation.
And many more!

Easy to Use
Defining a Seepage/Air flow Model
The unique CAD-like technology in AIR/W allows you to generate your finite element mesh by drawing regions on the screen. You can then interactively apply boundary conditions and specify material properties. You can even estimate the material property functions from easily measured parameters like grain-size, saturated conductivity, saturated water content, and the air-entry value. If you make a mistake, you can correct it using the Undo command.

Viewing the Analysis Results
Once you have solved your seepage problem, AIR/W offers many tools for viewing results. Generate contours or x-y plots of any computed parameter, such as head, pressures, matric suction, gradients, velocities, and conductivities. Air or water velocity vectors show flow direction and rate. Transient conditions can be shown as the changing water table position over time. Interactively query computed values by clicking on any node, Gauss region, or flux section. Then export results into other applications, such as Microsoft Excel or Word, for further analysis or to prepare presentations.

Typical Applications
AIR/W can model almost any groundwater problem, including:
Soil vapor extraction systems
Air pressure in tunnels for support and water inflow control
Air pressure response ahead of water infiltration fronts
Thermal / density dependent air flow that contributes to convective heat transfer in freezing / thawing soils (when coupled with TEMP/W)
The true matric suction (Ua-Uw) phenomenon