Fluid Network Definition (Simcenter Samcef Thermal)

The Fluid Network Definition simulation object models the heat exchange between a network of fluid elements (1) and a conductive mesh (2).

You can define obstacles (3) so that parts of the conductive mesh (4) do not participate in the exchange.

Heat exchange

In terms of convection, you can model the heat exchange in three different ways:

• You can define an Explicit Convection Coefficient.

• You can use Empirical Correlation Formulas between the Nusselt number and the Reynolds and Prandtl number.For information on the empirical formulas, see the Simcenter Samcef documentation.

• You can model the convection condition with an AMESim model (Temperature/Power) boundary condition (co-simulation approach).

Simcenter Amesim co-simulation workflow

With the co-simulation approach, you can use an AMESim model (Temperature/Power) model (AMESim.dll) to define the fluid elements, and the convection between the conductive mesh and the fluid elements. The Simcenter Samcef solver communicates with the Amesim model with a DIGI element. In this approach:

1. You build your model in Amesim and save it as an AMESim.ame model file. This file contains all the files that describe the Amesim model, but the Fluid Network Definition simulation object only uses the AMESim.dll file of the container.

2. You extract the AMESim.dll file from the AMESim.ame model file.You copy the AMESim.ame model file to a separate directory on your computer.You right-click the model and choose Extract All.

3. In the Fluid Network Definition simulation object:You select the AMESim.dll file.You position the DIGI element somewhere in the model. The positioning of this element has no effect on the model. You specify the Sample Time (TSAMPL) timestep that the DIGI element will use to communicate with the AMESim.dll model.

Note:

• The AMESim model (Temperature/Power) co-simulation is available only on Microsoft® Windows.

• The number of fluid elements defined in the Amesim model must match the number of fluid elements selected in the Fluid Network Definition simulation object.

For more details on the Amesim co-simulation approach, see the Simcenter Samcef documentation.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and the displayed partSimcenter Samcef as the specified solverHeat Transfer as the solution type
Simulation Navigator	Right-click Simulation Objects→New Simulation Object→Fluid Network Definition

Look up more details

Fluid Network Definition dialog box (Simcenter Samcef)

Fluid Flow dialog box (Simcenter Samcef Thermal)

Fluid Network Definition (Simcenter Samcef Thermal), Simcenter 3D 2021.1 Series

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