zone remesh command

Syntax

zone remesh keyword

Primary keywords:

boundary    interpolation    synchronized    density-smoothed    list    shape-quality

Note

Available in 2D only.

Automatic remeshing is a BETA functionality.[1]

Specifies remeshing boundary (required) and other parameters used in the remeshing functionality. Remeshing option must be enabled with model remeshing command.

boundary

Identifies, validates, and assigns zone faces to be used as a remeshing boundary. The remeshing boundary may consist of multiple disjoint parts but the exterior border of each part must form a closed polygon. For more details, see Automatic Remeshing.

by-slot s <range>

Specifies face group Slot s to be used as a container of all remeshing boundaries. Internal and/or external faces may be assigned various groups and placed in Slot s. All grouped faces from this slot will be used as remeshing boundaries.

pinchout-angle f

Specifies the maximum pinch-out angle f in degrees. During large-strain simulations, some gridpoints on the exterior remeshing boundaries may significantly move away or pinch-out from the main domain due to high velocities. This may form long and narrow triangular “spikes” which are non-physical and typically need to be removed. If the angle at the tip of the pinch-out is below specified value f, the remeshing logic “flattens” the zone at the tip to remove the pinching-out geometry. This helps with maintaining model convergence (however, in rare cases it may change model behavior and lead to issues with stability). The default value is 10 degrees. Users are advised to exercise caution when using larger pinch-out angles (e.g., > 15-20 deg) as this may lead to unrealistic and excessive changes in model geometry.

interpolation keyword ...

Specifies the type or mode of interpolation for zone-based parameters from old to new meshes. Most zone-based parameters are interpolated within unique remeshing domains (domain-level). One exception is zone density which is interpolated within and across the internal remehsing boundaries (model-level).

mode keyword ...

Sets the interpolation mode.

synchronized

Sets inverse-distance weighted interpolation mode for zone-based quantities. Quadratic decay function is used for all the parameters which assures that the nearest zones from the old mesh are accounted with much higher weights than other zones within a search radius.

density-smoothed

Sets inverse-distance weighted interpolation mode for zone-based quantities with smooth exponential decay function used for density and quadratic function used for all other parameters. Using smoother interpolation function provides more uniform density distribution which improves model behavior during very large deformations. This is the default option.

list

Lists all remeshing parameters including geometry check / update interval.

shape-quality

Sets the minimum shape quality value. If zone shape quality falls below this value, remeshing is triggered. See more information about other criteria which may trigger remeshing in Automatic Remeshing. If user does not specify this option for remeshing, the default value of 0.025 is used. Note that zone shape quality and other geometry checks are performed only as specified with the zone geometry update-interval command or every 10 steps otherwise (by the default). To query the current geometry update interval, use zone remesh list.

Endnote