Additional Conductance types

The Type option in the Additional Conductance dialog box lets you create different types of conductances.

Conductive

Defines a linear conductive conductance, which is combined in parallel with any existing linear conductive conductances between the elements.

One-way Conductive

Defines a linear one-way conductive conductance going from the secondary element to the primary element. The primary elements are affected by the secondary elements. You use this type to model fluid flow, where the primary element is downstream and the secondary element is upstream. The conductance value is equal to the mass flow times the fluid's specific heat.

Series Conductive

Defines a linear conductive conductance in series with existing linear conductive conductances between the selected elements. You can use this type to model contact conductances.

Radiative

Defines a radiative conductance, which is combined in parallel with any existing radiative conductances between the elements. For radiative conductances, the conductance magnitude is specified in area units and is equal to GBVF × ε¹ × A¹, where:

• GBVF is the specified gray body view factor.

• ε¹ is the emissivity of the primary element.

• A¹ is the overlap area of the primary element with the secondary element.

One-way Radiative

Defines a radiative one-way conductance going from the secondary elements to the primary elements. The secondary elements are not affected by the conductance.

Series Radiative

Defines a radiative conductance in series with existing radiative conductances between the selected elements.

Free Convective

Defines a free convective conductance between the selected elements. The heat flow, Q, between primary and secondary elements is computed as:

Q= G× ΔT(1+x)

where:

• G is the free convective conductance value.

• x is the exponent.

• ΔT is the temperature difference between the primary and secondary element.

Follower

Defines a conductance where the temperature of the secondary elements are sinked to the temperature of the primary element. The secondary elements become temperature sinks in the model.

How do I

Create a thermal coupling

Model conduction in a bonded joint

Model conduction across a card edge guide

Model a BGA contact using a Thermal Coupling

Model additional thermal resistance in a bolted joint

Create a perfect contact thermal coupling

Learn more

Thermal Coupling magnitude 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

Command reference

Pre/Post video examples

Bulk Entry Descriptions

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Additional Conductance types, Simcenter 3D 2021.1 Series

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