Thermal Coupling magnitude types

The Type option in the Thermal Coupling dialog box lets you create different types of thermal couplings.

Total Conductance

The Total Conductance type defines an absolute conductance between the primary and secondary elements.

• The conductance value G describes the quantity of heat that flows from the hotter element to the cooler element per degree of temperature difference between the two elements (W/C in SI units).

• The conductance is distributed among the elements based on their surface area.

Total Resistance

The Total Resistance type defines a resistance to heat flow between the primary and secondary elements. , The Total Resistance is the inverse of a Total Conductance value.

• The conductance value R describes the temperature rise between two sets of elements per unit heat flow (C/W in SI units).

• The resistance is distributed among the elements based on their surface area.

Heat Transfer Coefficient

The Heat Transfer Coefficient type defines conductances G = h × A between the primary and secondary elements.

• The coefficient value h describes the quantity of heat that flows between two sets of elements per unit area, per degree of temperature difference between the two sets (W/C-m2 in SI units). You must set the h value.

Edge Contact

The Edge Contact type defines conductances G = CL × L between primary and secondary elements, where L is the length of the edge.

• The coefficient value CL describes the quantity of heat per unit length degree C that flows between the edge primary elements and the secondary elements (W/mm-C in SI units).

Warning:

The primary entities must be 1D beams or edges of 2D shells.

Conductive Gap

The Conductive Gap type defines conductances G = (k × A) / L between the primary elements and secondary elements, where L is the distance to the secondary element along the primary element's surface normal.

• The coefficient value k describes the quantity of heat that flows, per unit thickness of the interstitial material, per degree of temperature difference between the two elements sets (W/mm-C in SI units).

• If the coefficient value k is specified as the thermal conductivity in a gap between stationary parts or moving parts, you model conduction through an interstitial material or object of variable thickness. This allows you to model a variable distance between primary elements and secondary elements.

How do I

Create a thermal coupling

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Model a BGA contact using a Thermal Coupling

Model additional thermal resistance in a bolted joint

Create a perfect contact thermal coupling

Learn more

Additional Conductance types

Specifying a Coupling Resolution

Using the Only Connect Overlapping Elements option

Using the Overlap Projection Direction option

Temperature dependency for thermal and electrical couplings

Inputs to expressions

Look up more details

Thermal cyclic symmetry using perfect contact thermal coupling

Perfect Contact options

Auto-generated expressions

Thermal Coupling dialog box

Quick links

Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

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Thermal Coupling magnitude types, Simcenter 3D 2021.1 Series

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