Boundary Layer Options

You can set the following local boundary layer options, depending on the selected Layer Growth Method. Options set here will override the global settings on the selected faces only.

Option	Description
Transition Ratio	Determines the rate at which adjacent elements grow by controlling the volume-based size change between the last layer of elements in the boundary layer and the first layer of elements in the tet or hex region. The transition ratio is an ideal value and should produce accurate size change for extrusion from a planar boundary. However, areas of strong curvature will introduce an inaccuracy into the size change. If a proximity-based size function is being used, elements in proximity and elements with prism aspect ratios meeting the Maximum Height over base will ignore the Transition Ratio. Valid range is from 0 to 1.
Maximum Layers	Specify the maximum number of boundary layers you want the mesh to contain. Valid range is from 1 to 1000.
Growth Rate	Determines the relative thickness of adjacent boundary layers. As you move away from the extruded face, each successive layer is approximately one growth rate factor thicker than the previous layer. Valid range is from 0.1 to 5.0.
Number of Layers	Specify the number of layers you want to extrude into the body from the surface mesh. The mesher removes layers locally to improve quality; for example, when layers would otherwise collide with each other. Valid range is from 1 to 1000.
Maximum Thickness	Specify the height limit for the total combined thickness of the boundary layers. Value must be greater than 0.
First Layer Height	Sets the height of the first boundary layer, which consists of a single layer of prism elements formed against the elements of the surface mesh. Value must be greater than 0.
First Aspect Ratio	Control the heights of the boundary layers by defining the aspect ratio of the prisms that are extruded adjacent to the surface mesh (base). The aspect ratio is defined as the ratio of the prism base length to the prism layer height. Value must be greater than 0.
Aspect Ratio (base/height)	Control the thickness of the boundary layers by defining the height of the prisms that are extruded from the surface mesh (base). The aspect ratio is defined as the ratio of the prism base length to the prism layer height. Valid range is from 0.5 to 20.