Since version 2026, Flux 3D and Flux PEEC are no longer available.

Please use SimLab to create a new 3D project or to import an existing Flux 3D project.

Please use SimLab to create a new PEEC project (not possible to import an existing Flux PEEC project).

/!\ Documentation updates are in progress – some mentions of 3D may still appear.

Flux mesh import workflow

Introduction

This section presents the steps to follow in Flux to import the mesh through the Nastran file.

Workflow

In the following table, the steps to follow in Flux for a nominal scenario are presented.

Stage Description Illustration
1 Open Flux, out of the Modeler context
2

Import the mesh

Project > Import > Import mesh > Import mesh from a HyperMesh/SimLab/OptiStruct (Nastran) file

  • Select the Nastran (or OptiStruct) file to import
  • Define the coordinate system and units if necessary
  • Change the « face split angle » if necessary: this angle corresponds to the minimal angle of facets* separation (two facets defining an angle superior or equal to this value will be separated to two faces. For an inferior angle, the facets are merged).
  • Center or not the geometry
  • Verify or not the geometry

That allows doing a « fast & quick » check of the geometry defaults: superimposed points, intersections between lines. To make a more complete check, launch the command:

Geometry/Check geometry

→ After the import, we recover in Flux :

  • The mesh elements
  • A « mesh object » containing the imported mesh
  • The lines, faces from the facets merge and the volumes from SimLab/HyperMesh components
  • The volume regions from the components
Note: * a facet corresponds to an elementary face defined by a mesh surface element
3

It is possible to create the infinite box in Flux after mesh import (if air box has not been create in SimLab or HyperMesh):

  • Create infinite box: Physics > Infinite box > New
  • Complete infinite box to generate the air volume and the associated mesh:

    Physics > Infinite box > Complete infinite box

Choose the option : « Add geometry and mesh after mesh import »