These parameters are specific to the pre inflation process.
- Fluent Meshing Offset Method
In addition to their described function, several global prism meshing parameters are used to determine the Fluent Meshing Offset Method.
If Prism height limit factor is unspecified, the Fluent Meshing Offset Method will be uniform with First Height determined as follows:
If Initial height is specified, that value is used for Fluent Meshing First Height.
If Initial height is unspecified, the First Height value is calculated using Total height, Height ratio (r) and Number of Layers (n).
First Height = Total height / (1 + r + r^2 + r^3 + ... + r^(n-1))
If Initial height and Prism height limit factor are both specified, the Fluent Meshing Offset Method will be last ratio with the following parameters:
Fluent Meshing First Height = Initial height.
Fluent Meshing Last Percent = 1 / Prism height limit factor.
However, if Max height over base is set, then the Fluent Meshing Last Percent parameter will be limited to a maximum of 1 / Max height over base.
If Prism height limit factor is specified but no Initial height or Total height, the Fluent Meshing Offset Method will be aspect ratio with the following parameters:
Smoothing Options are disabled.
Fluent Meshing Last Aspect Ratio = 1 / Prism height limit factor.
Fluent Meshing First Aspect Ratio = Last Aspect Ratio * (r^(n-1)), where r = Height ratio and n = Number of layers.
- Fix First Layer
This option allows you to keep the specified first layer height and scale the heights for the remaining layers in situations where prism layers may intersect.
- Number of Orthogonal Layers
Used to specify the number of inflation layers which are orthogonal to the surface mesh.
- Gap Factor
Used to control the thickness of the tetra layer in regions of proximity. Increasing the Gap Factor will force a wider gap for a more robust tetra volume mesh, but may result in lower quality prisms (high aspect ratio). Decreasing the Gap Factor allows the inflation layers to come closer together which may improve prism quality but have negatively impact robustness. The default value is 0.5, which means that the minimum gap is one half the maximum base edge length at the node considered.
- Enhance Normal Computation
If enabled, the mesher will attempt to smooth the current prism cap surface by aligning adjacent face normals to within 0.1 degree. The default is disabled.
- Enhance Offset Computation
If enabled, the mesher will attempt to smooth the current prism cap surface by adjusting the layer offset to within 0.1 %. The default is disabled.
- Smoothing Level
Used to choose the amount of smoothing after each prism layer is generated.
Note: If Smoothing Level is set to , then
cell-quality-improveis set to true which involves smoothing of normals in the current layer and perturbation smoothing to improve cell quality in the lower layer.- Max Allowable Cap Skewness
Sets the quality criterion for triangles in the prism cap surface after smoothing. If this parameter is not achievable, prism meshing will stop. The default value is 0.98.
- Max Allowable Cell Skewness
Sets the cell quality criterion for the prism layers after smoothing. If this parameter is not achievable, prism meshing will stop. The default value is 0.90.
- Min Last Layer Aspect Ratio
Used to override the calculated, or default, value.
The default value is 2.0, if both Max height over base and Prism height limit factor are unspecified.