Description

The table at the top of the Attributes tab lists the number of voxel blocks currently selected. The Voxel command frame provides three attributes used by the voxel initialization shown and described below.

The attributes tab provides tools to control min and max edge lengths and number of transition layers.
The attributes tab provides tools to control min and max edge lengths and number of transition layers.

A voxel block will default to using minimum and maximum edge lengths which are saved from when the block was created using the Build Refinement command. These default values are shown in the corresponding text fields which are grayed out, and Automatic is checked next to each. To change these values from their defaults, uncheck Automatic next to the Min. Edge field or the Max. Edge field, and type in the desired value. These values are absolute limiters. Therefore if there is an influence domain selected for this block which has cell edges smaller than the Min. Edge specified, the Min. Edge value is used.

Transition Layers is a target for the number of layers of equally-sized (i.e. isotropic) hexahedral cells placed between two consecutive transition regions in a voxel block. Using the image below, note that the transition regions contain a combination of pyramid and tetrahedral volume cells. The default value for this parameter, when Use Default is checked on, is 3. The image below shows an example of the transition regions in a voxel block where hexes are clustered in the region of a Box source (source not shown).

Transition layers between two levels of hexes viewed using the Cell Type diagnostic in Examine.
The transition regions between different levels of hexahedral cells viewed using the Cell Type examine diagnostic function. In this example, the Transition Layers parameter was set to its default value of 3.