Thermal Coupling — Advanced

Use a Thermal Coupling — Advanced simulation object to create area-proportional conductances between dissimilar meshes. When you solve the model, the conductances are established from each of the Primary Elements you specify to the nearest of the Secondary Elements you specify. The primary and secondary elements do not need to be aligned.

Advanced thermal coupling types

There are three types of advanced thermal coupling:

• The 1 Way type creates a one-way conductance from the primary to the secondary elements. You can specify a Total Conductance value or a Heat Transfer Coefficient value that is constant or varies with time, temperature, heat flow rate, temperature difference, or thermal capacitance.You need to create a chain of one-way conductances and make sure that the extreme upstream and downstream ends of this chain are temperature constrained elements.Example: In this example, you must create three one-way thermal couplings to chain the four surfaces, by connecting: Surface (1) to surface (2)Surface (2) to surface (3) Surface (3) to surface (4)You must also define temperature constrained elements at the extremities of the chain: one constraint on surface (1) and the other on surface (4). For example, you can define either a Temperature constraint or Convection to Environment constraint.

• The User Function type allows you to create a customized thermal coupling based on a subroutine you write.

Supported variables and functions

The following table lists the independent variables and auto-generated expressions for the quantities of the 1 Way type of advanced thermal coupling that you can define using fields and expressions.

Quantity	Variables	Auto-generated expressions
Total Conductance****Heat Transfer Coefficient	TimeTemperatureHeat flow rateTemperature differenceThermal capacitanceSpatial variablesTime, spatial variablesTemperature, spatial variablesHeat flow rate, spatial variablesTemperature difference, spatial variablesThermal capacitance, spatial variables	fluid_temperature heat_flow_rate mass_flow_rate nx ny nz pressure radius rotational_speed temperature temperature_difference thermal_capacitance thickness time volume_flow_rate x y z

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	Thermal Coupling — Advanced
Simulation Navigator	Right-click the Simulation Objects node→New Simulation Object→Thermal Coupling — Advanced

How do I

Create a 1 Way Thermal Coupling

Create a user function thermal coupling

Learn more

User function thermal coupling

Inputs to expressions

Specifying a Coupling Resolution

Using the Only Connect Overlapping Elements option

Using the Overlap Projection Direction option

Look up more details

1 Way options

User Function options

Auto-generated expressions

Thermal Coupling — Advanced 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

Simcenter 3D tutorials

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Thermal Coupling — Advanced, Simcenter 3D 2021.1 Series

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