Interface Resistance

An Interface Resistance simulation object models additional conductances in series between two entities that already conduct heat between them.

You can control the magnitude of these additional conductances by the specifying a value for:

• Total Conductance

• Total Resistance

• Heat Transfer Coefficient

The software distributes these additional conductances among the primary elements proportionally by area.

Example:

In the image above, the PCB shares nodes with the port, conducting heat. However, an Interface Resistance simulation object can be added to better represent the model.

Selecting an Interface Resistance type

The Type option in the Interface Resistance dialog box lets you control how the software creates the conductances. There are three types of interface resistance depending on the specified solution and analysis:

Surface Interface

Applies the interface resistance to a free or shared face of a polygon body meshed with 3D elements. This type has only primary elements (no secondary elements).

Edge Interface

Applies the interface resistance to a free or shared edge of a polygon face meshed with 2D elements. This type has only primary elements (no secondary elements).

Interface Between 2 Sets

Applies the interface resistance between faces, or edges (in any combination). This type of Interface Resistance has both primary and secondary elements. The software detects the nodes shared between the two sets and inserts the resistance in series between the two sets.

There are two modeling scenarios for using an Interface Resistance simulation object: conduction interface modeling and free face interface modeling. For more information, see Modeling scenarios for using an Interface Resistance.

Supported variables and functions

The following table lists the independent variables and auto-generated expressions for the Surface Interface and Edge Interface quantities that you can define using fields and expressions.

Quantity	Variables	Auto-generated expressions
Total ConductanceTotal ResistanceConductance per Length***Heat Transfer Coefficient**	TimeSpatial variablesTime, spatial variables	fluid_temperatureheat_flow_ratemass_flow_ratenxnynzpressureradiusrotational_speedtemperaturetemperature_differencethermal_capacitancethicknesstimevolume_flow_ratexyz
*Applicable to Edge Interface type of Interface Resistance only.

In expressions, you can also use all built-in functions that are listed in Mathematical functions in expressions and most built-in functions that are listed in Thermal-flow functions in expressions.

Where do I find it?

Application	Pre/Post
Command Finder	Interface Resistance
Simulation Navigator	Right-click the Simulation Objects node→New Simulation Object→Interface Resistance

How do I

Create an Interface Resistance

Learn more

Inputs to expressions

Look up more details

Modeling scenarios for using an Interface Resistance

Auto-generated expressions

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

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Interface Resistance, Simcenter 3D 2021.1 Series

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