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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.

 


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:

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