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Documentation

Geometry Primitives

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.

cartesian box geometry primitive
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.

sphere geometry primitives
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.

cylinder geometry primitive in simscale
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.

static simulation of a bearing block
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.

local slice geometry primitive
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:

Last updated: August 4th, 2020

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