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


TEMP/W

 

Heat transfer analysis

TEMP/W is a powerful finite element software product for modeling heat transfer and phase change in porous media. TEMP/W can analyze simple conduction problems to complex surface energy simulations with cyclical freeze-thaw.

The software can be used for geothermal analyses and design of geotechnical, civil, and mining engineering projects, including systems subjected to freezing and thawing temperature changes.


Key Features

Convective Boundary

The convective heat transfer boundary condition simulates artificial ground freezing or other processes involving the flow of fluid over or within a bounding surface.

Forced Convection

Heat transfer is often governed by forced convection in natural hydrogeological systems. TEMP/W can be fully-integrated with SEEP/W or AIR/W to analyze heat transfer via groundwater flow or air flow, respectively.

Land Climate Interaction

Analyze problems that involve a coupling between climatic conditions and the thermal response within the ground in TEMP/W using the surface energy balance boundary condition.

Model Thermosyphons

TEMP/W implements a rigorous thermosyphon boundary condition that can accommodate either two-dimensional or pseudo-3D analysis of thermosyphons. 

TEMP/W can model almost any geothermal problem

Download GeoStudio to view GSZ files

Freezing Analysis of a Buried Pipeline

TEMP/W is used to model the freezing front propagation around a pipeline. The examples demonstrates the use of circular regions and the application of the appropriate boundary conditions and material properties.

Download the GeoStudio data files
Read the analysis details

Surface Energy Balance

This example evaluates the effect of snow on the thermal response within the ground during the winter months, using the surface energy balance boundary condition in TEMP/W to simulate land-climate interactions.

Download the GeoStudio data files
Read the analysis details

Thermosyphons

The objective of this TEMP/W example is to conduct a transient analysis of thermosyphons installed near Fairbanks, Alaska. The model is assumed to have permafrost year round at the base. A heated building rests on the ground surface.

Download the GeoStudio data files
Read the analysis details

Frozen Ground Containment Barrier

This example considers the use of a frozen soil barrier to isolate contaminated water, after McKenziey et al. (2007).

Download the GeoStudio data files
Read the analysis details

TEMP/W's intuitive modeling workflow

Create a TEMP/W analysis and set up the problem workspace. Choose analysis type, including steady-state or transient, and define initial temperature 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 temperature conditions. Select from Simplified Thermal, Full Thermal, or Coupled Convective material models. Define thermal material constants or functions for thermal conductivity, volumetric heat capacity, unfrozen water content, and more. Define the initial temperature conditions for transient scenarios using results from other TEMP/W analyses or defined spatial functions.

Define thermal boundary conditions to simulate temperature, heat flux (q) or heat rate (Q) conditions. Time-varying conditions can also be modeled for each of these boundary conditions. Thermosyphons or convective surfaces can also be modeled as well as the surface energy balance.

Open Draw Mesh Properties to refine the mesh drawn on the entire domain, or along specific geometric regions, lines or boundaries. Interface elements can also be created to simulate thin insulation layers.

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 temperature contours are displayed, along with the location of the phase-change isoline, or 0C isoline for the time step, and heat flux vectors. 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. Flow paths based on energy flow rate vectors can also be drawn in steady-state analyses.

Interactively select any node or gauss region to view result information, including temperature, thermal 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 temperature, heat flux, cumulative energy flux 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

TEMP/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 Conduction, Convection, and Phase Change Formulation

TEMP/W uses a finite element-based formulation to analyze thermal changes in the ground due to environmental changes or due to the construction of facilities such as buildings or pipelines. The comprehensive formulation makes it possible to analyze both simple and highly complex geothermal problems. TEMP/W can be applied to the geothermal analysis and design of geotechnical, civil, and mining engineering projects, including facilities subjected to freezing and thawing temperature changes.

The TEMP/W formulation includes conduction, forced-convection, and phase change, making it possible to analyze such problems as permafrost changes due to climate change, the effect of man-made structures on the geothermal regime, or ground freezing applications in groundwater flow systems.

The phase change formulation in TEMP/W accounts for the latent heat associated with water turning into ice and ice turning into water. The rate at which the latent heat is absorbed or released is controlled by an unfrozen water content function. Above the phase change temperature, all the water is unfrozen. As the temperature falls below the phase change point, the portion of the water that remains unfrozen decreases. Complete flexibility in defining the unfrozen water content function makes it possible to analyze a wide variety of ground conditions. When linked with SEEP/W or AIR/W it can consider convective heat transfer of flowing water or moving air.


Typical Applications

TEMP/W can model almost any geothermal problem, including:

  • Degradation of permafrost due to man-made structures
  • Ground freezing for soil stabilization, including use of freezing pipes around mine shafts or thermosyphons on top of earth dams
  • Freeze-thaw action beneath roadways and airport runways
  • Frost depth penetration beneath chilled structures such as a recreational ice surface or a highway during the winter 
  • Climate effects on the ground surface energy balance
  • Development of a frost bulb around a chilled pipeline
  • Assessment of various insulation alternatives for reducing freezing and/or thawing
  • Analysis and design of frozen capillary cover barriers
  • Groundwater flow control design

Get converged solutions for difficult problems

The introduction of the latent heat of phase change into a heat transfer analysis introduces a significant amount of non-linearity into the analysis. This non-linearity is manifest in numerical oscillation during the iterative solution process. TEMP/W implements a rigorous convergence criterion and under-relaxation scheme, making it possible to model demanding freeze-thaw problems, as well as models with a large spatial variability in temperatures across the domain. Graphing tools are available during run-time to help you judge if convergence has been achieved.


Estimate Material Properties from Measured Data

TEMP/W provides convenient material estimation capabilities for determining the thermal conductivity, unfrozen water content, and volumetric heat capacity functions.


Use Simplified or Full Thermal Material Models

Different problems require different levels of sophistication for defining the material properties. TEMP/W provides a simplified material model that considers only unfrozen and frozen conditions, while incorporating phase change at a single phase change temperature. TEMP/W also includes a full-thermal material model that makes thermal conductivity a function of temperature, while phase change occurs over a temperature range as defined by the unfrozen volumetric water content. The general thermal conductivity function makes it possible to consider a smooth transition in conductivity as the temperature changes from thawed to frozen conditions and vice versa. Using the full thermal material model allows you to analyze problems in which the presence of ice in the pore-space plays a role in the thermal response of the system.


Model Land-Climate Interaction

There are many problems in geotechnical engineering that involve a coupling between climatic conditions and the thermal response within the ground. These types of problems can be analyzed in TEMP/W using the Surface Energy Balance boundary condition.

TEMP/W uses climate data to determine evaporation rates, snow accumulation and snowmelt. A surface energy balance approach is used to determine the resulting energy flux over the ground surface and subsequent ground temperatures.


Model Thermosyphons

Thermosyphons are used in many cold regions to extract energy from the ground to maintain frozen ground conditions. TEMP/W implements a rigorous thermosyphon boundary condition that can accommodate either two-dimensional or pseudo-3D analysis.


Convective Heat Transfer Boundary Condition

The convective heat transfer boundary condition provides a convenient approach for the simulation of artificial ground freezing or other processes involving the flow of fluid over or within a bounding surface.


Forced Convection with Water Flow

Heat transfer is often governed by forced convection in natural hydrogeological systems. TEMP/W can be fully integrated with SEEP/W to analyze heat transfer via groundwater flow.


Coupled Convective Material Model

The coupled-convective material model can be used for an integrated TEMP/W and SEEP/W analysis, adjusting the thermal conductivity and volumetric heat capacity as the ratio of pore-water, pore-air, and pore-ice changes duration the transient seepage analysis.


Forced Convection with Air Flow

Many geotechnical engineering problems, such a heat movement in mine-site waste dumps, involve density-driven air flow. TEMP/W can be integrated with AIR/W to seamlessly model heat transfer via conduction and forced-convection with the moving air.


Convenient Initial Condition Definition

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


Initial Temperature for Activated Materials

Materials can be activated with a specified temperature for transient analyses, providing a convenient way to set the initial condition for entire regions in which the starting condition is nearly constant.


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

TEMP/W includes analysis options for modelling pseudo three-dimensional problems such as heat extraction from a single thermosyphon.


Powerful Graphing of Results

Graphing is critical for the interpretation of a heat transfer analysis. The powerful graphing options in GeoStudio make it possible to plot critical information in TEMP/W such as the location of the freeze front through time, the energy extracted or input into the system, heat flux rates, and more. All of this data can be exported or copy/pasted directly into spreadsheet software.


Visualize Flow Paths and Flux across Sections

Once the analysis is complete, you can interactively click on any part of the domain to visualize the actual 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 TEMP/W

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


Optimization and Calibration

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






Acquista: TEMP/W

 
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