Creating geometry for Fluid Domain meshing

Rules for defining the Fluid Mesh volume

You can define a Fluid Mesh type of Fluid Domain simulation object on:

• Any single body.

• Any number of bodies that do not intersect, such as those shown below.

When bodies intersect, the software still attempts to create the Fluid Mesh, but you may have to set additional options on the 3D Flow page in the Create dialog box.

You can define a Fluid Mesh type of Fluid Domain simulation object on intersecting bodies when:

• Two intersecting bodies each have one coplanar face such that no other faces intersect. No edges of the larger face intersect with the smaller coplanar face, as shown below.If the bodies' intersecting faces are not coplanar, or if more than one face intersects, the software cannot create a Fluid Mesh.

• Two intersecting bodies have partially overlapping co-planar faces. With this configuration, you must select Idealized or Master Part from the Source of Domain Geometry list on the 3D Flow page of the Solution dialog box.

• Two intersecting bodies with multiple intersecting edges if you modify them with the Intersect command to become three bodies. When you create the Fluid Mesh, you must select all three bodies. See Intersect for more information.

Other configurations of intersecting geometry are unsupported, as shown below.

Generally, any intersecting bodies can be modified to support Fluid Domain meshing, by using the Unite command. See Unite for more information.

Rules for modeling faces for flow openings

The Flow Boundary Condition types Inlet Flow, Outlet Flow, Opening, and Recirculation Loop model openings in the boundary of the Fluid Domain through which fluid enters or leaves the domain. Screens and Internal Fans fulfill the same function on faces that delimit an opening between two chambers within the fluid domain. They are defined by selecting a face which is in contact with 3D fluid elements.

In some cases, you can select an existing face that is appropriately positioned and constrained, eliminating the need for any additional geometry creation. But in other cases, no such face exists.

How do I

Create a Fluid Domain mesh

Check Fluid Domain mesh quality

Learn more

Defining a boundary layer mesh using a Fluid Domain

Modeling obstructions in the Fluid Domain

Fluid Domain mesh quality

Inputs to expressions

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Creating geometry for Fluid Domain meshing, Simcenter 3D 2021.1 Series

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