Primitives for Simcenter 3D Space Systems Thermal

A primitive is an object that defines a set of 2D or 3D elements in terms of their size, geometric arrangement, location, and orientation with respect to an associated coordinate system. You can position the primitive with respect to the global coordinate system by translating or rotating the primitive's origin. There are a number of types of primitives, each based on a simple geometric form.

When you create a primitive you select or create a mesh collector that defines the properties of the elements in the primitive. The primitive appears in the Simulation Navigator under the mesh collector node.

Specifying the top and bottom side of a 2D element

When you create a primitive with 2D elements, the top side of each 2D element faces a specific direction by default, depending on the type of primitive:

• With three-dimensional primitives, such as the Box Primitive or Sphere Primitive, the top sides of the associated 2D elements face outward, away from the primitive.

• With two-dimensional primitives, such as the Rectangle Primitive or Disc Primitive, that you create by specifying parameters, the top sides of the associated 2D elements face the +Z direction.

• With two-dimensional primitives, such as the Rectangle Primitive or Disc Primitive, that you create by selecting points, the top sides of the associated 2D elements are determined by the right hand rule, using the sequence P1, P2, P3 to define a rotation.

Note:

3D elements have no top or bottom side, so the rules do not apply to primitives created with these elements (example: solid brick, solid sphere).

To reverse the 2D element direction for a 3D primitive, select theTop side faces inward check box. To reverse the 2D element direction for a 2D primitive, select Top side is reversed.

Where do I find it?

With the FEM file active, choose Insert→Primitive and select the primitive type to create.

How do I

Create a primitive

Learn more

Thermal meshing

Fluid meshing

Immersed boundary meshing

Duct network meshing

Look up more details

Meshing for Simcenter 3D Thermal/Flow, Electronic Systems Cooling, Space Systems Thermal

Special considerations for thermal meshing

Working with multi-layer shell elements

Geometry creation for body-fitted fluid meshing

Geometry preparation for immersed boundary method

Defining the mesh size for fluid modeling

Node to geometry matching in large dimension models

Meshing for turbulence modeling

Meshing consideration and wall functions

Thermal and flow element quality

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

Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

Primitives for Simcenter 3D Space Systems Thermal, Simcenter 3D 2021.1 Series

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