If the wall zone has a fluid or solid region on each side, it is called a ``two-sided wall''. When you read a grid with this type of wall zone into FLUENT, a ``shadow'' zone will automatically be created so that each side of the wall is a distinct wall zone. In the Wall panel, the shadow zone's name will be shown in the Shadow Face Zone field. You can choose to specify different thermal conditions on each zone, or to couple the two zones:
To couple the two sides of the wall, select the Coupled option under Thermal Conditions. (This option will appear in the Wall panel only when the wall is a two-sided wall.) No additional thermal boundary conditions are required, because the solver will calculate heat transfer directly from the solution in the adjacent cells. You can, however, specify the material type, wall thickness, and heat generation rate for thin-wall thermal resistance calculations, as described above. Note that the resistance parameters you set for one side of the wall will automatically be assigned to its shadow wall zone. Specifying the heat generation rate inside the wall is useful if, for example, you are modeling printed circuit boards where you know the electrical power dissipated in the circuits but not the heat flux or wall temperature.
To uncouple the two sides of the wall and specify different thermal conditions on each one, choose Temperature or Heat Flux as the thermal condition type. ( Convection and Radiation are not applicable for two-sided walls.) The relationship between the wall and its shadow will be retained, so that you can couple them again at a later time, if desired. You will need to set the relevant parameters for the selected thermal condition, as described above. The two uncoupled walls can have different thicknesses, and are effectively insulated from one another. If you specify a non-zero wall thickness for the uncoupled walls, the thermal boundary conditions you set will be specified on the outer sides of the two thin walls, as shown in Figure
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