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Freeze / Thaw

PROBLEM

In northern climates it is often useful to understand the potential movement of heat beneath the ground. Of particular importance is the transition from water to ice as this phase change can have implications in regions where there is permafrost. Such applications can include potential freezing or thawing beneath cooled or heated above-ground pipelines, heat dissipation beneath roadways, the influence of cooling next to water bodies, or the interaction of buried pipelines in a permafrost environment. The zone of influence around the heated or cooled structure is difficult to predict with simple hand calculations.

SOLUTION

SVHeat allows numerical modeling of the freeze thaw process. The phase change between ice and water can easily be modeled with a software as well as the dissipation of heat due to conduction. When coupled with SVFlux, the software can model the convective movement of heat as well. The software also includes a climatic interface such the climate data can be entered and N- factors can be used to calculate heat entering the soil.

 


ArtificialGroundFreezing_convect

This example is to simulate artificial ground freezing. To simplify the model only one freeze pipe is installed. The following features are illustrated in this example.-- Frozen ground developed in ground freezing process, -- Water flow around frozen ground, and -- Thermal convection effect on temperature distribution and finally effect on frozen ground regime.

Model filename: GeoThermal > ArtificialGroundFreezing_convect.svm

Tags: GeoThermal,SVFLUX,SVHEAT,2D,Transient,Water Table,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

ArtificialGroundFreezing_no_convect

Example of hydro-thermal coupling model of artificial ground freezing, showing water flow around frozen ground without thermal convection being applied.

Model filename: GeoThermal > ArtificialGroundFreezing_no_convect.svm

Tags: GeoThermal,SVFLUX,SVHEAT,2D,Transient,Water Table,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

CanalBankFreezingThawing_50h

This is a shorter version of the CanalBankFreezingThawing model presented in the Example Manual. Example is to illustrate hydrothermal coupling in the simulation of soil and ice freeze-thaw behavior on a canal bank. The water in the canal is also included in the analysis. The model simulation time is 50 hours, The canal bank is freezing in the first 25 hours, and after that time, the thawing process happens.

Model filename: GeoThermal > CanalBankFreezingThawing_50h.svm

Tags: GeoThermal,SVFLUX,SVHEAT,2D,Transient,Water Table,Canals,Geothermal,Freeze / Thaw,Water resources management,Arctic design,Canal

Attachments:

ConvectiveBoxHeatedBelow

A simple box model is used to illustrate the convective airflow when a warm temperature (TH) is introduced to the bottom of the box and a cooling temperature (TL) is applied to the top. This example uses a SVAirFlow and SVHeat coupled model to simulate natural convection of air or thermo-buoyant motion under the different temperatures TH and TL.

Model filename: GeoThermal > ConvectiveBoxHeatedBelow.svm

Tags: GeoThermal,SVAIRFLOW,SVHEAT,2D,Transient,Arctic design,Freeze / Thaw

Attachments:

ConvectiveBoxHeatedFromSide

The model geometry is a simple square with the size of 2 m x 2 m. A warm and a cooling temperature are applied to the vertical sides. The top and bottom of the box are adiabatic. The box sides are impermeability to the airflow.

Model filename: GeoThermal > ConvectiveBoxHeatedFromSide.svm

Tags: GeoThermal,SVAIRFLOW,SVHEAT,2D,Transient,Arctic design,Freeze / Thaw

Attachments:

CouttsKonrad

Model originally published by Coutts and Konrad (1994). Chilled pipeline in discontinuous permafrost.

This model is presented in the Unsaturated Soil Mechanics in Engineering Practice textbook.

Section 10.9 Two-Dimensional Heat Flow Example Involving Chilled Pipeline.

Figures 10.26 - 10.30

Model filename: USMEP_Textbook > CouttsKonrad.svm

Tags: USMEP_Textbook,SVHEAT,2D,Transient,Arctic design,Freeze / Thaw,Benchmarking,USMEP,Geothermal

Attachments:49c213e642-Fig10.26.png
8f2c63cd47-Fig10.27.png
3625365bfb-Fig10.28.png
54a8ced23e-Fig10.29.png
107dcd0fab-Fig10.30.png

ErhHeatConvection_AikenV14

Erh heat convection problem with a constant water flow = 0.0014 m/s

Model filename: GeoThermal > ErhHeatConvection_AikenV14.svm

Tags: GeoThermal,SVHEAT,Axisymmetric,Steady-State,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

ErhHeatConvection_AikenV16

Erh heat convection problem with a constant water flow = 0.0016 m/s

Model filename: GeoThermal > ErhHeatConvection_AikenV16.svm

Tags: GeoThermal,SVHEAT,Axisymmetric,Steady-State,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

ErhHeatConvection_HanfordV15

Erh heat convection problem with a constant water flow = 0.0015 m/s

Model filename: GeoThermal > ErhHeatConvection_HanfordV15.svm

Tags: GeoThermal,SVHEAT,Axisymmetric,Steady-State,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

Freeze_Thaw_Check

This model is designed to verify the mass conservation during soil freezing and thawing.

Model filename: GeoThermal > Freeze_Thaw_Check.svm

Tags: GeoThermal,SVHEAT,1D Vertical,Transient,1D,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

HairpinThermosyphon

This example demonstrates the implementation of a thermosyphon boundary condition. Reference: Cold Regions Science and Technology 53 (2008) 283?297

Model filename: Thermosyphon > HairpinThermosyphon.svm

Tags: Thermosyphon,SVHEAT,2D,Transient,Geothermal,Thermosyphon,Freeze / Thaw,Arctic design,Benchmarking

Attachments:

HairpinThermosyphon_tunnel

This model duplicates the results of the HairpinThermosyphon model, except that the thermosyphon bounday conditon is applied to a tunnel object instead of a region.

Model filename: Thermosyphon > HairpinThermosyphon_tunnel.svm

Tags: Thermosyphon,SVHEAT,2D,Transient,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

HarlanNixon1978

Solution of Laplacian equation for two dimensional heat flow. Analytical results obtained from Harlan and Nixon (1978).

This model is presented in the Unsaturated Soil Mechanics in Engineering Practice textbook.

Section 10.10.1 Description of Two-Dimensional Heat Flow Problem.

Figures 10.31 - 10.33

Model filename: USMEP_Textbook > HarlanNixon1978.svm

Tags: USMEP_Textbook,SVHEAT,2D,Steady-State,Geothermal,Freeze / Thaw,Arctic design,Benchmarking,USMEP

Attachments:62c76c7f02-Fig10.31.png
2bd9adf106-Fig10.32.png
b8045d9ac4-Fig10.33.png

HeatedPipe

Plan view analysis of footings on frozen soil. What are the effects of heating a pipeline near the footings.

Model filename: Foundations > HeatedPipe.svm

Tags: Foundations,SVHEAT,Plan,Steady-State,Pipe Design,Foundation design / settlement,Freeze / Thaw,Foundations,Arctic design

Attachments:

HighwayEmbankmentCooling

Example of 3D thermosyphon application in cooling a highway embankment. The air temperature changes using a sin function with a period of 30 days.

Model filename: Thermosyphon > HighwayEmbankmentCooling.svm

Tags: Thermosyphon,SVHEAT,3D,Transient,Road design,Thermosyphon,Freeze / Thaw,Transportation,Arctic design,Roadways

Attachments:

horizontal_soil_column

Example of horizontal soil column with SVFlux and SVHeat coupled. Run time is less than 10 seconds.

Model filename: GeoThermal > horizontal_soil_column.svm

Tags: GeoThermal,SVHEAT,1D Horizontal,Transient,1D,Arctic design,Freeze / Thaw

Attachments:

JameData

Using Jame Test8 data.

Model filename: GeoThermal > JameData.svm

Tags: GeoThermal,SVHEAT,1D Horizontal,Transient,1D,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

SimpleHighwayEmbankmentCooling

A simple example of thermosyphon application for highway embankment cooling.

Model filename: Thermosyphon > SimpleHighwayEmbankmentCooling.svm

Tags: Thermosyphon,SVHEAT,2D,Transient,Road design,Thermosyphon,Transportation,Roadways,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

SimpleHighwayEmbankmentCooling_Well

This model duplicates the results of the SimpleHighwayEmbankmentCooling model, except that the thermosyphon bounday conditon is applied to a well object instead of a region.

Model filename: Thermosyphon > SimpleHighwayEmbankmentCooling_Well.svm

Tags: Thermosyphon,SVHEAT,2D,Transient,Arctic design,Freeze / Thaw,Benchmarking

Attachments:

SoilColumn_Snow_30days

This example illustrates the climate boundary condition used in svflux/svheat coupled model. The climate includes precipitation, snow, evaporation, and air temperature. The snow effect on ground surface temperature is considered using NFactor changing with time.

Model filename: GeoThermal > SoilColumn_Snow_30days.svm

Tags: GeoThermal,SVFLUX,SVHEAT,1D Vertical,Transient,Precipitation,Climatic Coupling,Evaporation,1D,Arctic design,Freeze / Thaw

Attachments:

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