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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_initial

This model established the initial pore-water conditions for use in the ArtificialGroundFreezing model.

Model filename: GeoThermal > ArtificialGroundFreezing_initial.svm

Tags: GeoThermal,SVFLUX,2D,Steady-State,Water Table,Geothermal,Arctic design,Freeze / Thaw

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:

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:

SoilFreezingThawing1Y

This model is to demonstrate hydro-thermal coupling including seepage, evaporation, freezing, and thawing under climate condition. It will take few hours to finish running the model.

Model filename: GeoThermal > SoilFreezingThawing1Y.svm

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

Attachments:

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