Geometry primitives are used for multiple purposes during the simulation setup. In this document, we will go through the types of primitives, as well as their applications.
Types of Geometry Primitives
Cartesian Box
A cartesian box is specified with the minimum and maximum box coordinates in the x, y, and z-directions. The figure below shows a cartesian box for a mesh region refinement.
Figure 1: Cartesian box used for a region refinement. In external aerodynamics, it’s particularly helpful to capture the wake.
Sphere
To create a sphere, one has to specify its center coordinates, as well as the radius.
Figure 2: Sphere to specify an absolute power source
Cylinder
Cylinders are often used for mesh refinements. Another common application is to create momentum sources, which mimic the effects of a fan.
To specify a cylinder, the user needs to input a point of reference for the base of the cylinder. By adjusting the axis, one can determine the direction and length of the cylinder. Finally, the user should also define the radius for the cylinder.
Figure 3: Using a cylinder placed inside a pipe to define a momentum source
Point
Points are mostly used to create probe point result controls. The center coordinates are sufficient to set up a point geometry primitive.
Figure 4: Static simulation on a bearing block. A probe point is set for a point data result control.
Local Slice
Local slices are used in the pedestrian wind comfort (PWC) and incompressible (LBM) analysis types. They are planes (2D) which are placed in the domain for data visualization. For more information about local slices, please check this page.
Figure 5: Local slice geometry primitive for contours visualization
List of Applications
Find below a list of applications where geometry primitives can be used, as well as the available types:
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