CTRAN/W is a finite element software
product that can be used to model the movement of contaminants
through porous materials such as soil and rock. The comprehensive
formulation of CTRAN/W makes it possible to analyze problems
varying from simple particle tracking in response to the movement
of water, to complex processes involving diffusion, dispersion,
adsorption, radioactive decay and density dependencies. You
can apply CTRAN/W to the analysis and design of geotechnical,
civil, hydrogeological, and mining engineering projects.
CTRAN/W is integrated with SEEP/W and has the same CAD-like
interface. The two software products must be used in tandem
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.
Defining
a Contaminant Transport Model
Once you have solved your flow problem with SEEP/W, you can
use the graphical tools in CTRAN/W to interactively apply
boundary conditions and specify material properties. Conduct
a simple particle tracking analysis, or define dispersivity,
diffusion, adsorption, decay and density to conduct an advection-dispersion
analysis. If you make a mistake, you can correct it using
the Undo command.
Viewing the Analysis Results
Once you have solved your contaminant transport problem, CTRAN/W
offers many tools for viewing results. Generate contours or
x-y plots of any computed parameter, such as concentration,
mass, adsorption, dispersion, or Peclet and Courant numbers.
Velocity vectors show the flow direction and rate. Examine
the contaminant mass in the solid and liquid phases at any
location. Transient conditions can be shown by plotting the
changing concentration levels over time. Interactively query
computed values by clicking on any node, element Gauss region,
or flux section. Then export the results into other applications,
such as Microsoft Excel or Word, for further analysis or to
prepare presentations.
Use
SEEP/W Velocities in CTRAN/W
One of the major components in a contaminant transport analysis
is the velocity of the water, which can be obtained from a
SEEP/W analysis. Once this velocity is known, it can be used
in CTRAN/W to study the transport of contaminants.
Perform Density Dependent Analyses with CTRAN/W and SEEP/W
In density dependent fluid flow, the velocity of the water
is dependent on the solute concentration. The water velocity
in turn influences the movement of the solute. The iterative
transfer of water velocity from SEEP/W to CTRAN/W and the
transfer of concentration from CTRAN/W to SEEP/W makes it
possible to do density dependant fluid flow analyses.
CTRAN/W 2007 is part of GeoStudio 2007, an integrated tool
containing GEO-SLOPE's leading suite of geotechnical modeling
software products: SLOPE/W, SEEP/W, SIGMA/W, QUAKE/W, TEMP/W,
CTRAN/W, AIR/W and VADOSE/W. Using GeoStudio means you can
run all of these products in one environment, creating one
model definition that is shared among all products.
For example, when you create your geometry and material
properties in one product, they are available immediately
in all other products. Your model is stored in one definition
file, which is based on the industry-standard XML format.
Sharing the data lets you run many analyses on the same
problem. You can use the results from one analysis in another,
or import files created by previous versions of the software.
Typical Applications
CTRAN/W
can model almost any contaminant transport problem, including:
When
a contaminant enters the ground, the dissolved constituents
will migrate due to the movement of the water. In addition,
the contaminant disperses due to hydrodynamic mixing and molecular
diffusion. The migration also may be retarded due to adsorption
and radioactive decay. The advective-dispersive differential
equation is derived by applying the principle of mass balance
to an element of porous medium, with consideration of advection,
dispersion, adsorption and decay.
CTRAN/W computes adsorption using the adsorption function
and the computed nodal concentrations. It then computes the
mass quantity in both the fluid phase and the solid phase.
CTRAN/W can also model contaminant movement by simply tracking
particles from user-defined locations. For each time step,
CTRAN/W moves the particles a distance based on the volumetric
water content and the SEEP/W-computed water velocities.
When you purchase a CTRAN/W 2007 license you also receive
a copy of the CTRAN/W Engineering Methodology book, Contaminant
Modeling with CTRAN/W 2007. This book is not a software
manual but a full-length book that discusses why and how to
model. It does not describe how to use the commands in the
software or which buttons to click - that is provided in detail
in the Online Help. Instead it is about thinking: how to think
before, during and after setting up and solving a model. The
Engineering Methodology book has chapters devoted to:
The
GeoStudio Student Edition is a free product designed as an
aid to learning geotechnical numerical modeling. It is an
ideal teaching tool for university professors both at the
undergraduate and graduate levels.
The software contains limited versions of SLOPE/W, SEEP/W,
SIGMA/W, QUAKE/W, TEMP/W, CTRAN/W, AIR/W and VADOSE/W.
The
GeoStudio Basic Edition is a feature-limited version of seven
products: SLOPE/W, SEEP/W, SIGMA/W, QUAKE/W, TEMP/W, CTRAN/W
and AIR/W. The Basic Edition is ideal for use in routine engineering
practice for the analysis of problems with limited geometric
complexity. While primarily intended for analyzing the stability
of natural and man-made earth slopes, you can also use GeoStudio
Basic for the analysis of confined and unconfined steady-state
seepage problems, for the analysis of linear-elastic settlement
and stress distribution problems, for the tracking of contaminants
within ground water flow and for the analysis of freeze-thaw
problems.
Pentium
III with Microsoft Windows 2000, XP, or Vista
Intel dual-core processor with 1 GB of RAM recommended
800x600 display (1024x768 or higher is recommended)
Microsoft Internet Explorer 6 or higher
.NET 1.1 (.NET 2.0 included on the CD)
| 
CTRAN/W is a finite element software
product that can be used to model the movement of contaminants
through porous materials such as soil and rock. The comprehensive
formulation of CTRAN/W makes it possible to analyze problems
varying from simple particle tracking in response to the movement
of water, to complex processes involving diffusion, dispersion,
adsorption, radioactive decay and density dependencies. You
can apply CTRAN/W to the analysis and design of geotechnical,
civil, hydrogeological, and mining engineering projects. 
Product Integration Chart
