Solid-to-Solid Contact Examples
The following examples involve contact between faces of one solid body and coplanar or concentric faces of an adjacent solid body.
- Example 1: Multiple small bodies in contact with one larger body (for example multiple semiconductor dies on a common substrate):
- Example 2: A contact body partially overlaps multiple target body faces:
If the thermal resistance properties are the same for all contact areas, assign contact to the face of the large object using either the Conductance per Area or Impedance option for a uniform contact conductance. Do not use the Thermal Conductance or Thermal Resistance option for this case, since the total contact area differs from the area of the selected face:
Alternatively, if thermal resistance properties differ among the smaller objects, select faces with the same thermal resistance properties and define contact separately for each set of such faces. If the total contact area matches the total area of the selected model faces and the total conductance or resistance is known for the total area, any resistance type can be used to define the contact. Otherwise Conductance per Area or Impedance options are recommended:
When the thermal resistance properties are the same for all overlapping face areas, assign contact to the common face (bottom of Box1 in this example). Since the total contact area matches the area of the selected face for this example, you can choose any resistance type for defining the contact:
When the thermal resistance properties differ, assign contact separately to each of the non-common faces (top of Box2 and top of Box3 in this example) using either the Conductance per Area or Impedance option. Do not use the Thermal Conductance or Thermal Resistance option for this case, since the total contact area differs from the area of the selected face:
