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Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Info e Commerciali Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
AIR/W 2019
Lingua: Ing S.O.: Win
Produttore: GeoSlope
  ADALTA è Importatore Unico e Distributore Ufficiale per l'Italia per i prodotti GeoSlope



Air transfer analysis

AIR/W is a powerful finite element software product for modeling air transfer in mine waste and other porous media. AIR/W can be used to model a range of scenarios, from simple single phase air transfer problems to complex coupled air-water systems.

The true power of AIR/W is unlocked when it is coupled with TEMP/W to model forced-convection heat flow and density-dependent air flow. This type of analysis is important for studying mine closure, acid rock drainage, or gas transfer.

Key Features

Density Dependent Air Flow

AIR/W can be integrated with TEMP/W to model air transfer via free convection. Density-driven air transfer is often a dominant mechanism in systems subjected to seasonal ground temperature variations.

Estimate Material Properties

The air conductivity function can be generated based on the dry-soil air conductivity, a user-selected volumetric water content function, and basic soil properties, such as soil classification or grain size distribution.   

Forced-Convection Heat Transfer

Combine AIR/W with TEMP/W to model forced-convection heat transfer. This process often governs the thermal regime in coarse-grain materials such as waste rock piles, rip-rap, and layered embankments.

Single or Dual Phase Flow

Air transfer analyses can be conducted using a single phase material model that only considers pressure and gravity-driven air flow. Alternatively, a dual phase material model can be used by coupling air flow and water transfer.


AIR/W can model almost problem involving air transfer through porous media

Download GeoStudio to view GSZ files

Passive Cooling

Goering (2000) investigated passive cooling within an embankment constructed of unconventional and highly porous material as a means of preserving permafrost. The objective of this example is to simulate similar convective cell behavior in AIR/W and TEMP/W as observed by Goering.

Download the GeoStudio data files
Read the analysis details

Pore-Air Entrapment During Infiltration

This example illustrates the effect of pore-air entrapment during infiltration into an unsaturated soil given a range of material properties, for both open and closed systems.

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Read the analysis details

Tempe Cell Simulation

This example illustrates the ability of SEEP/W and AIR/W to simulate the results of a Tempe cell laboratory analysis for determining the volumetric water content function of a soil.

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Read the analysis details

Verification - Heated Closed System

The change in pressure of a constant volume of dry air subject to an increase in temperature is simulated in this verification example. The temperature increase is simulated by TEMP/W while the air pressure response is simulated by AIR/W.

Download the GeoStudio data files
Read the analysis details

AIR/W's intuitive modeling workflow

1 Create problem workspace and analysis properties

Create an AIR/W analysis and set up the problem workspace. Choose analysis type, including steady-state or transient, and define initial pore-air pressure and air flow conditions, convergence criteria, and time duration and increments.

2 Draw or import domain regions from a CAD program

Draw the regions in your domain using CAD-like drawing tools, including drawing polygon and circular regions, coordinate import, copy-paste geometric items, length and angle feedback, region splitting and merging, and direct keyboard entry of coordinates, lengths, and angles. Alternatively, import AutoCAD DWG or DXF files directly into GeoStudio to create your domain geometry.

3 Define material properties, pore-air pressure & air flow

Define the material properties for your analysis, assign them to regions on the domain. Define the air conductivity function, along with the volumetric water content and hydraulic conductivity functions for the coupled SEEP/W analysis, if necessary. Define the initial air pressure and air flow conditions for transient scenarios using results from other AIR/W (or SEEP/W) analyses or defined spatial functions.

4 Define boundary conditions

Define air and hydraulic (if coupled with SEEP/W) boundary conditions to simulate air pressure, air flow, total head, pressure head and more. Time-varying conditions can also be modeled.

5 Draw mesh properties

Open Draw Mesh Properties to refine the mesh drawn on the entire domain, or along specific geometric regions, lines or boundaries.

6 Solve your analyses

When your problem is completely defined, start the analysis process in the Solve Manager window. The Solve Manager displays the solution progress, allowing you to cancel or stop/restart if necessary. While the solution is in progress, you can look at preliminary results in the Results window.

7 Display computed pore-air pressure

When the Solver is finished, the air pressure contours are displayed, with air vectors shown on the domain. You can display other contours using the Draw Contours window, including material properties, air flow, and gradients. Contour legends and properties can also be modified. Labels can be added to contour lines in Results View.

8 View results, generate plots and reports

Interactively select any node or gauss region to view result information, including pore-air pressure, air flux, air content, material properties, and more. Display plots of computed results over the x- or y-direction or create time-varying plots of results in transient analyses, such as air density, air flux, cumulative air flux, air content, and more. Generate reports of the definition and results, and export into other applications such as Microsoft Excel for further analysis.

Complete Feature List

Integrated into the GeoStudio Suite

AIR/W is integrated into the GeoStudio suite, and therefore has access to the GeoStudio features for creating your model, analyzing it, and viewing results.

Comprehensive Air Flow Formulation

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

Typical Applications

AIR/W can model geotechnical problems including:

  • Simple single phase air flow problems
  • Density dependent air flow that contributes to convective heat transfer in freezing / thawing soils (when coupled with TEMP/W)
  • Soil vapor extraction systems
  • Evaluation of tunnel air pressure for water inflow control
  • Air and water pressure response ahead of water infiltration fronts
  • Movement of gases through porous media (when coupled with CTRAN/W)

Formulated for Single Phase or Dual Phase Flow

Air transfer analysis can be conducted using a single phase or dual phase material model. Single phase air transfer means that only pressure and gravity-driven air flow is considered, while storage changes occur due solely to pressure changes. The dual phase material model integrates with SEEP/W to allow air conductivity and storage changes to be linked to changes in water content.

Estimate Material Properties from Measured Data

The air conductivity function can be generated based on the dry soil air conductivity and a user-selected volumetric water content function. The estimation process requires only fundamental information such as soil classification or grain size distribution.

Comprehensive Range of Generalized Boundary Conditions

AIR/W supports a comprehensive list of boundary condition options including pore-air pressure, pore-air total head, flux rate, and flow rate. In keeping with the entire GeoStudio suite, AIR/W makes use of either constants or generalized functions for boundary condition definition. As such, actual field data or user-specified functional relationships can be pasted into AIR/W to define boundary conditions.

Integrate with TEMP/W to model Diverse Problem Sets

AIR/W can be combined with TEMP/W to model free-convection (density-driven) air transfer. Integration of AIR/W and TEMP/W also allows for the simulation of heat transfer via forced-convection.

Convenient Initial Condition Definition

Initial conditions for transient analyses can be determined using a variety of options including a spatial function of pore-air pressure, activation pore-air pressure, or results from another GeoStudio finite element analysis.

Model in 1D, 2D, Plan or Axisymmetric View

AIR/W includes analysis options for modeling pseudo three-dimensional problems such as air permeameter field tests or coupled-air water radial flow to a well.

Powerful Graphing of Results

Graphing is critical for the interpretation of an air flow system. The powerful graphing options in GeoStudio make it possible to plot critical information in AIR/W such as pore-air pressure profiles, air flow versus time, and material properties. All of this data can be exported or copy/pasted directly into spreadsheet software.

Visualize Air Flow Paths and Flux across Sections

Once the air flow analysis is complete, you can interactively click on any part of the domain to visualize the actual air flow path through this point. You can also set up flux sections to calculate the amount of flow across the section during the analysis.

Sensitivity Analysis with AIR/W

A sensitivity analysis can be readily conducted with AIR/W by cloning multiple analyses using the Analysis Tree and then making slight changes to each one.

Optimization and Calibration

AIR/W can be paired with other software to conduct optimization/calibration of material properties.

Acquista: AIR/W

Prova Demo: AIR/W