Create a pressureless duct network

This example shows the steps to setup and solve a duct with mass flow network for a heat exchanger, starting in the displayed FEM:

1. Assign a Duct with Mass Flow type of 1D duct mesh collector to an existing 1D duct type mesh.

2. Define a Duct Fan/Pump type of Duct Flow Boundary Conditions simulation object.

3. Define a Convection Coupling type of Thermal Coupling — Convection simulation object.

4. Solve and post-process results on a 1D duct with mass flow elements.

Assign a Duct with Mass Flow type of 1D duct mesh collector

In the Simulation Navigator , right-click the duct mesh collector node under the 1D Collectors node, and choose Edit.

• From the Type list, select Duct with Mass Flow.

• From the Fluid Material list, select Water or click Choose material to select a material from the material library or to define a new material.

• Click OK.

In the Simulation Navigator , right-click the FEM node, and choose Display Simulation → Simulation file.

Define a Duct Fan/Pump type of Duct Flow Boundary Conditions simulation object

Choose Home tab→Loads and Conditions group→Simulation Object Type →Duct Flow Boundary Conditions .

• Verify that Type is set to Duct Fan/Pump.

• In the Parameters group, from the Mode list, select Mass Flow.

• In the Mass Flow (per Element) box, enter the mass flow or select Field to define a mass flow that varies with time or temperature.

Select the elements where you want to set the mass flow and click OK to close the dialog box.

Define a Convection Coupling type of Thermal Coupling — Convection simulation object

Choose Home tab→Loads and Conditions group→Simulation Object Type →Thermal Coupling — Convection .

Verify that Type is set to Convection Coupling.

Select the convective faces for the convecting region. In this example, all the polygon faces are selected.

In the Fluid Ducts group, click Select Object .

Select the 1D duct with mass flow elements for the fluid ducts. In this example, all the 1D elements are selected.

• In the Magnitude group, in the Heat Transfer Coefficient box, enter the value for the heat transfer coefficient or select Field to define a heat transfer coefficient that varies with time or temperature.

• Click OK.

Solve and post-process results on a 1D duct with mass flow elements

How do I

Create a duct flow network

Create a thick wall duct flow network

Create a duct flow network and model heat transfer using 2D shells

Create a duct flow network and model heat transfer using 3D solid elements

Connect the duct network to the 3D flow domain

Learn more

1D duct flow networks

Duct analysis workflow

Duct Flow Boundary Conditions

1D meshing

Ensuring consistent 1D element orientation during mesh creation

Look up more details

Modeling ducts with 1D elements

Modeling ducts and their walls with 1D elements

Modeling ducts with 1D elements and their walls with 2D elements

Modeling the interface between ducts and 3D fluid elements

Modeling ducts inside 3D solid elements

Understanding ducts and area definition

Solver calculation for duct elements

Solver calculation for duct with mass flow elements

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Command reference

Pre/Post video examples

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

Create a pressureless duct network, Simcenter 3D 2021.1 Series

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