Fluid Domain

Use the Fluid Domain simulation object to create a mesh in a fluid volume. You can define the material, mesh size, and additional mesh parameters.

When you use a Fluid Domain simulation object to mesh a volume, the solver creates a mesh on the volume you select automatically meshing around the solids contained in the main volume. See Modeling obstructions in the Fluid Domain for more information.

Note:

Specify only constant values or non-spatial fields on boundary conditions that you apply to geometry meshed using the Fluid Domain simulation object. The software does not support spatial fields or auto-generated expressions for these boundary conditions.

Fluid Domain types

The Type menu in the Fluid Domain dialog box lets you create two types of Fluid Domain mesh:

• The Fluid Mesh type defines a mesh for general fluid volumes.

• The Fluid Surface Mesh type modifies a Fluid Domain definition by specifying the location and parameters of boundary layers.

Fluid Domain meshing process

The Fluid Domain simulation object is defined at the Simulation file level, unlike standard meshes which are created at the FEM level. The mesh is created automatically by the flow solver just before the solver launches the analysis.

To inspect or modify the fluid domain mesh before solving, see Create a Fluid Domain mesh.

Note:

You can also use the standard meshing commands to explicitly create a fluid mesh in the FEM file. Different geometry limitations and techniques apply, as well as other differences. See Fluid meshing for more information.

Fluid Domain meshing in Assembly FEMs

You can use the Fluid Domain simulation object in an assembly FEMs, however, since assembly FEMs do not have a top level idealized part, Polygon Geometry must be set from the Source of Domain Geometry list, on the 3D Flow page in the Solution dialog box.

Where do I find it?

In a Simulation file, with an active solution that has the appropriate solver, analysis type, and solution type selected:

• Choose Home tab→Loads and Conditions group→Fluid Domain .

• In the Simulation Navigator, right-click Simulation Objects and choose New Simulation Object→Fluid Domain.

How do I

Create a Fluid Domain mesh

Check Fluid Domain mesh quality

Learn more

Creating geometry for Fluid Domain meshing

Defining a boundary layer mesh using a Fluid Domain

Modeling obstructions in the Fluid Domain

Fluid Domain mesh quality

Inputs to expressions

Look up more details

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

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Fluid Domain, Simcenter 3D 2021.1 Series

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