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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
CTRAN/W 2019
Lingua: Ing S.O.: Win
Produttore: GeoSlope
  ADALTA è Importatore Unico e Distributore Ufficiale per l'Italia per i prodotti GeoSlope


CTRAN/W

 

Solute and gas transfer analysis

CTRAN/W is a powerful finite element software product for modeling solute and gas transfer in porous media. CTRAN/W can be used to model simple diffusion-dominated systems through to complex advection-dispersion systems with first-order reactions.

CTRAN/W can be used to model a vast array of geo-environmental problems involving the movement of dissolved species or gases that originate from either man-made or naturally occurring sources.


Key Features

Comprehensive Formulation

CTRAN/W offers the capability to model a diverse set of solute and gas transport mechanisms including diffusion, advection, dispersion, adsorption, decay, and density-dependent flow due to its comprehensive formulation.

Dual Phase Gas  Transfer

CTRAN/W models gas transfer in both the gaseous and aqueous phases. A bulk diffusion coefficient, longitudinal dispersivity, and transverse dispersivity are defined for each phase.

Saturated and Unsaturated

CTRAN/W is formulated for saturated and unsaturated transport, allowing the coefficient of diffusion to vary with water content and the advection process to adjust as groundwater velocities change in the unsaturated zone.

Sorption and Kinetic Reactions

CTRAN/W can model equilibrium sorption and first-order reactions such as radioactive decay, biodegradation, and hydrolysis.

CTRAN/W can model almost any contaminant transport problem

Download GeoStudio to view GSZ files

Caesium 137 Transport

Caesium-137 (Cs-137) is an anthropogenic radioactive isotope formed as a product of nuclear fission. The objective of this example is to analyze Cs-137 transport into an unconfined aquifer using CTRAN/W. The effect of adsorption and decay on solute concentrations and mass discharge is highlighted.

Download the GeoStudio data files
Read the analysis details

Transport and Consumption of Oxygen in Cover Material

The objective of this example is to analyze oxygen transport through an unsaturated cover system and explore the effectiveness of oxidation within the water retention unit.

Download the GeoStudio data files
Read the analysis details

Effects of Salt Concentration on Water Flow

This example demonstrates a water transfer analysis influenced by solute concentration effects (i.e., density-dependent flow).

Download the GeoStudio data files
Read the analysis details

Source and Exit Boundary Conditions

This example demonstrates the use of four boundary conditions in CTRAN/W, including constant concentration, source concentration, free exit mass flux, and total mass flux of zero.

Download the GeoStudio data files
Read the analysis details

CTRAN/W's intuitive modeling workflow

Create a CTRAN/W analysis and set up the problem workspace. Choose the analysis type from: steady-state solute, transient solute, steady-state gas and transient gas transfer. Define the initial pore-water pressure and concentration conditions, convergence criteria, and time duration and increments.

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.

Define the material properties for your analysis, assign them to regions on the domain, and then define your initial concentration conditions. Define advection, dispersion or diffusion properties and add optional decay half-life. Define the initial seepage and concentration conditions for transient scenarios using results from other SEEP/W or CTRAN/W analyses or defined spatial functions.

Define concentration boundary conditions to simulate concentration, mass flux (q), mass rate (Q), source concentration, or free exit mass flux conditions. Time-varying conditions can also be modeled.

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

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.

When the Solver is finished, the concentration contours are displayed. Velocity vectors and the phreatic surface can also be viewed on the domain using results from the associated SEEP/W analysis. You can display other contours using the Draw Contours window, including pore-water pressure, material properties, water flow, and gradients. Contour legends and properties can also be modified. Labels can be added to contour lines in Results View.

Interactively select any node or gauss region to view result information, including concentration, mass flux, 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 concentration, mass flux, cumulative mass 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

CTRAN/W is integrated into the GeoStudio suite, and therefore has access to the GeoStudio features for creating your model, analyzing it, and viewing results. CTRAN/W relies on SEEP/W to perform groundwater flow analysis required for simulating mass transport.


Comprehensive Solute and Gas Transport Formulation

CTRAN/W uses a finite element based formulation to model the movement of solutes and gases through porous materials such as soil and rock. The comprehensive formulation of CTRAN/W makes it possible to analyze problems from simple transport due to water movement, to complex processes involving diffusion, dispersion, adsorption, radioactive decay and density dependencies. CTRAN/W can be applied to the evaluation and design of geotechnical, civil, hydrogeological, and mining engineering projects.

CTRAN/W is designed to be used in tandem with a seepage analysis such as SEEP/W to analyze contaminant transport. SEEP/W computes the water flow velocity, volumetric water content, and water flux. CTRAN/W uses these parameters to compute the contaminant migration.


Typical Applications

CTRAN/W can model almost any solute or gas transport problem, including:

  • Flow of contaminants from a surface pond
  • Flow of dissolved hydrocarbons
  • Flow of radioactive contaminants
  • Gas and solute transport through fractured rock
  • Sea-water intrusion into coastal aquifers
  • Brine transport
  • Landfill leachate migration
  • Gas movement through an unsaturated mine cover

Formulated for Saturated and Unsaturated Soils

CTRAN/W is formulated for saturated and unsaturated transport, allowing the coefficient of diffusion to vary with water content and the advection process to adjust as groundwater velocities change in the unsaturated zone. In addition, CTRAN/W is capable of modelling changes in mass within a system caused by variation in water content due to processes like drainage, condensation, and vaporization.


Model Sorption and Kinematic Reactions

Solutes and gases often do not exhibit conservative behaviour while moving through soil and rock formations. Consequently, CTRAN/W is formulated to simulate many of the mechanisms contributing to this behaviour, including equilibrium sorption and first-order kinematic reactions such as radioactive decay, biodegradation, and hydrolysis.


Dual Phase Gas Transport

The gas transfer formulation gives consideration to advection and dispersion in both the gaseous and aqueous phases and includes irreversible first order reaction processes such as oxidation and decay.


Comprehensive Range of Generalized Boundary Conditions

CTRAN/W supports a comprehensive list of boundary condition options for gas and solute transport including concentration, mass rate, mass flux, source concentration, and free exit mass flux. In keeping with the entire GeoStudio suite, CTRAN/W makes broad use of generalized functions for boundary condition definition. CTRAN/W computes contaminant migration using these parameters and the advective-dispersive differential equation, derived by applying the principle of mass balance to an element of porous medium given advection, dispersion, adsorption, and decay. CTRAN/W computes adsorption using an adsorption function and the simulated nodal concentrations to determine the quantity of mass in both the fluid and solid phases.


Convenient Initial Condition Definition

The initial concentration for a transient analysis can be defined using a variety of options including a region activation concentration, spatial function, or by using the results from another CTRAN/W analysis.


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

CTRAN/W includes analysis options for modelling pseudo three-dimensional problems.


Powerful Graphing of Results

Graphing is critical for the interpretation of solute and gas transport analyses. The powerful graphing options in GeoStudio make it possible to plot critical information in CTRAN/W such as the spatial distribution of concentration, concentration verses time, mass fluxes, changes in mass within the domain, cumulative mass discharge, and more. All of this data can be exported or copy/pasted directly into spreadsheet software.


Sensitivity Analysis with CTRAN/W

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


Integration with SEEP/W

CTRAN/W uses the results from a water transfer analysis as computed by SEEP/W for advection-dispersion modelling. Alternatively, CTRAN/W can be run simultaneously with SEEP/W to analyse density-dependent water flow.

 




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