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More Harpoon features…

Geometry features

Separation

Harpoon can separate any geometry into separate parts by region (ie contiguous sections) or by feature angle. These parts are then used in the exports. All names are conserved in the output.

Mirror

Parts may be mirrored in X, Y or Z directions.

Add/Delete/Merge

Triangles may be added, deleted or merged to improve the imported geometry.

Scale/Translate/Rotate

Imported parts may be scaled, translated or rotated if required.

Delete/Merge/Rename

Imported parts may be deleted, merged or renamed.

Intersections

Intersecting geometry can cause problems when meshing. Harpoon can automatically generate intersection lines to help improve mesh quality in these regions.

 

 

Hole finding

Harpoon can detect and display holes in the imported geometry. These can be automatically filled using a proprietary algorithm.

Feature Line

Feature lines may be added, deleted, split or merged. Different angles may also be chosen for their creation.

Line Segment Separation

Lines may now be separated one segment at a time. This avoids the creation of hundreds of line groups

Feature Line Hole Filling

Lines may now be used as templates to fill holes. This  is of use for the creation of boundary inlets/outlets for example

 

Meshing features

Boundary layer

Boundary layers can be created on a per part basis.

Controls

The visibility of Parts mapbe turned on/off. Only visible parts are meshed. This is useful when studying the effects of changes in geometry.

Stretched hexas

Harpoon allows the hexas to be stretched in X, Y or Z. This can give a dramatic reduction in the number of cells required.

Refinement

Refinement regions (boxes/spheres/trapezoids) can be used to control the volume size in specific regions.

Expansion

Harpoon offers global slow or quick expansion rates from one hexa level to another. Expansion of more than 2-1 never occurs. A more complex expansion is possible from any part, which penetrates the volume much more. This is useful for leading edges of wings, for example.

Hanging nodes

Harpoon produces hanging nodes but these can be removed for those solvers that do not support them.

Mesh types

Body-fitted hex dominant, body-fitted 100 percent tet and cartesian

Mesh regions

Harpoon can mesh internally, externally or all regions

Batch

Harpoon may be run in batch mode.

Volume management

Different regions of elements can be grouped into volumes which can then be edited on a macroscopic scale. Volumes can be deleted or merged, and any individual elements affected will be updated accordingly. Similarly, surface meshes can be merged together.

 

 

Wrapping

Dirty geometry can be wrapped. this is useful to do where large holes are in  the input geometry. The reulsting surface mesh could then be reused as input to get a volume mesh

Cell Count Reduction

After meshing, individual volumes may be coarsened in the X, Y or Z directions. This can give a 10%-40% reduction in cell count.

Surfaces

Surfaces may be merged or renamed

Mesh smoothing

Harpoon gives users the ability to smooth generated meshes to a specified quality criterion. Some solvers struggle with extremely skewed elements, so the user has the option of specifying a limit to the ‘skewness’ of the cells.

Cell quality control

Harpoon can be used to highlight which individual cells are of poor quality. Users can then interactively move the nodes of problem cells and see how this affects the quality of the cell and those around it.

Leak detection

In a mesh that may contain millions of cells it can be extremely difficult to locate missing elements or ‘leaks’. Any leaks will play havoc with solvers so it is vital to find them. Harpoon can find these by a proprietary scanning method which displays the route taken through problem holes.

Sprayshop

Take your geometry into the sprayshop and adjust the levels interactively. This gives the user extreme control of the mesh setup

Compact Mesh

It is possible to compact the mesh to reduce the RAM required before saving or creating Boundary Layers.

 

 

General features

Mac and beyond

CFD/ FE solvers have evolved throughout the world to run on a dizzying array of platforms, but meshing technology has not kept up. Harpoon is one of the few meshing applications available today that runs on a Mac. A 64-bit AMD Opteron version is also available.

Logical parts hierarchy

Multi-part assemblies can be navigated logically through the parts hierarchy, a dedicated section of the GUI.

Native File Format

A Native file format may be saved. The format is machine independent.

 

Mesh Editing

Cells may be added or deleted. Cells may also be manually adjusted or automatically smoothed with a new improved smoothing algortihm.

Surface Mesh Cleaning

Surface meshes may now be cleaned automatically. Harpoon will search the surface for bumps and other irregularities and attempt to resolve them.

Overlapping Geometry

Harpoon can now choose between the first or last geometric part in creating the surface mesh when it encounters overlapping geometry.

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