Introducing Bolt Automatic Hex Meshing


Massively fast. Massively automatic. Massively parallel.

Whatever meshing software you use, you need to add Bolt to your tool chest. Bolt is a push-button solution for generating all-hex meshes from complex geometries with little or no user interaction. Most models can be meshed by simply clicking the Mesh button. For other models, use the mesh controls to adjust mesh, size, and smoothing.

Bolt makes meshing easy.

1. Import watertight model

2. Push the Mesh button

3. Export your mesh


Watch a video about Bolt.

Introduction to Meshing With Bolt

Bolt it!

Bolt will work great for most structural analyses and is ideal for models with irregularly-shaped topology, such as:

  • Biomedical
  • Microstructures
  • Metal forming
  • Viscous flow
  • Rapid prototyping
  • Additive manufacturing
  • And more...

We know that Bolt won't work for every simulation, but it is insanely amazing for a lot of simulation. Try it out and see what we mean.

Bolt it!

No more cutting up models.

Hex meshing without the preparation time

Traditional pave-and-sweep meshing methods require you to decompose the model into sweepable volumes. This could be more than 60% of the time it takes to get a good mesh. Bolt uses a very advanced overlay-grid method to generate an all-hex mesh. Unlike the pave-and-sweep method that takes hours or days to prepare, Bolt allows you to mesh your model with the simple click of the Mesh button.

Tolerant of dirty geometry.

You know that all geometry is not the same. Many of the models you get from a designer require significant clean up and defeaturing. Repairing problems takes time, a lot of time. Bolt doesn't require you to manually fix gaps, overlaps, or misalignments. Bolt uses a new volume fraction approach that has been developed and tested for more than six years to accurately represent the topology of your model without having to fix it first.

Bolt can mesh dirty geometry

Massively parallel.

Bolt is massively parallel

Even without having to clean up and prepare your geometry, large and complex models can take a long time to mesh. Bolt speeds up actual meshing time by dividing the model into parts and meshing each part in parallel. Bolt's meshing algorithm is massively parallel and will use as many processors as specified and available.

Get excellent results—fast.

For many complex simulations, Bolt produces equivalent or superior results when compared to pave-and-sweep meshes that take hours or days to generate. Depending on the type of analysis you are doing, Bolt can give you excellent results in minutes.

Bolt meshes complex geometry, fast

The Bolt meshing process.

The Bolt process

The Bolt meshing process begins with creating a Cartesian grid base mesh of a bounding box around your model. Nodes from the base grid that are near the boundaries are projected to the geometry, locally distorting the nearby hex cells. A pillow layer of hexes is then inserted at the surfaces by duplicating the interface nodes on either side of the boundaries and inserting hexes. While constraining node locations on the interfaces, Bolt uses a set of smoothing procedures to improve mesh quality of the boundary hexes.

The Bolt difference.

Grid overlay methods are not new. It's pretty easy to create a conformal or stair-step mesh of perfect hexes inside a model. What isn't easy is the superior way that Bolt handles the layer between the conformal mesh and the geometry's outer surface. Bolt's sophisticated algorithms ensure that these hexes are of the highest quality. That's what makes a Bolt mesh superior.

The Bolt difference

Supported file formats.

Bolt imports facets files, such as .STL, and exports the mesh into various solver formats.

File Format File Extension Import/Export Supported Versions
STL (.stl*) Import facets
Wavefront Object (.obj*) Import facets
Stanford Polygon (.ply*) Import facets
Cubit Facets (.fac*) Import facets
Assimp (.*) Import various formats See
ANSYS (.*) Export mesh
ANSYS (*.cdb) Export mesh 16.0-17.0
Abaqus (.inp) Export mesh
Fluent (.msh) Export mesh
Exodus, Genesis (.e, .exo, .g, .gen) Export mesh
I-DEAS (.unv) Export mesh
IMPETUS (*.k*) Import and export mesh All
LS-DYNA (.k) Export mesh
Nastran (.bdf) Export mesh NX Nastran only
OpenFOAM Export mesh
Patran (.pat, .neu, .out) Export mesh
UCD (.ucd) Export mesh

Try Bolt Free For 14 Days.

(That's all you'll need to be impressed)

Have a model that you previously meshed with another tool? We'd be interested in how the results of a Bolt mesh compares to what you are using now. Try Bolt on your own models free.

Get Bolt