Use the Pinholes subpanel to identify and close pinholes (circular internal loops lying on a relatively planar surface). You can search for pinholes as well as elongated non-circular slots based on diameter.  Pinholes with a diameter equal to or less than the value you specify will be located and can be removed/closed. Similarly, slots whose lengths are less than the diameter you specify will also be found and can be closed.

A pinhole is any internal loop that can be matched to a circular shape under two conditions:

HyperMesh uses a ratio between the circumference and the area to determine if it is a pinhole.  It marks as a pinhole those internal loops that are equivalent or smaller than the given diameter.

The holes on the top of this part are pinholes.

Panel Inputs

Use the Surf Fillets subpanel to identify and remove surface fillets (curved surfaces that create a smooth transition between relatively perpendicular geometric entities). You can identify fillets based on radius, because fillets are always uniform arcs. You can also select a fillet by picking one of the edges that it connects. Once found, fillets can be removed using tools that display automatically after the find process.

In this image, the curved yellow surfaces are fillets.

When removing surface fillets, keep the following in mind: The algorithm starts after you select the surfaces and click remove.  Selected surfaces are considered to be fillet surfaces. The work of the removal algorithm does not depend on the result of the work by the fillet detection algorithm (which is invoked by pressing the find fillets button). You can manually select all those surfaces that you believe to be fillets and want removed. Once such a decision has been made and the surfaces are selected, the removal algorithm does not interfere with this decision in any way other than simply failing to defillet wrongfully (in its opinion) selected surfaces.

The algorithm operates in the following manner.  All surfaces adjacent to the fillet (selected) surfaces, and connected to them by green edges, are extended and intersected with each other.  Surface extensions are trimmed by intersections with other surfaces.  If trimmed extended surfaces and original fillet surfaces can form a closed body, then "defilleting" is possible and is made by replacing the set of fillet surfaces with the set of extended surfaces trimmed by mutual intersections.  The algorithm fails if modification of the body would require modification of some of the original surfaces adjacent to the fillet surfaces.  It also fails if extended surfaces trimmed by other surfaces become degenerate or if the intersection of extended surfaces requires an unreasonably large extension distance (several times the characteristic size of the fillet).  This means, for example, that the algorithm might legally (not as a result of a bug) fail if in the chain of several almost collinear fillets, you select only one of them. The reason for this is that if neighboring fillets are not treated as fillets, their extension is almost parallel to the selected fillet surface.  This may result in either a degenerate modification volume or such an extension would cut through existing surfaces and modifying the body would require retrimming of existing surfaces.  Another example of a non-feasible situation is when the fillet surface connects to almost parallel surfaces.  This situation would require intersection of those surface extensions at a distance far exceeding the characteristic fillet size.

Panel Inputs

Use the Edge Fillets subpanel to identify and remove edge fillets. Similar to surface fillets, edge fillets create smooth curves at the intersection of relatively perpendicular free edges.  You can identify them based on the radius of the fillet arc, and then remove them.

An edge fillet is a part of the trimming loop of a surface that can be roughly equivalenced to a circular arc under the conditions that are specified in the min and max radius and angle fields.

Current implementation does not detect or process fillets that belong to different surfaces or span across different suppressed surfaces.

In this image, the arrows point to edge fillets

Panel Inputs

Use the Duplicates subpanel to find duplicate surfaces and remove them. HyperMesh determines which faces are duplicates and which faces are correct based on multiple criteria. All other things being equal, it will try to select all duplicates except for the one with the lowest surface ID.  However, if deleting such surfaces would break continuity with adjacent (non-duplicate) surfaces, it checks for a surface that maintains continuity and retains that one (regardless of its ID) while selecting the other duplicates.

Panel Inputs

Use the Symmetry subpanel to find symmetrical surfaces or compare selected surface sets for symmetry.  You can reorganize found symmetric surfaces into separate components or delete one subset of a pair of symmetric surface sets.

This can be helpful with highly symmetrical components, because you can then perform geometry cleanup on only one half, mesh it, and then mirror the mesh instead of having to clean up the entire component prior to meshing.

Panel Inputs

The following action buttons appear throughout the subpanels: