CAD Model Import

CAD geometry can be directly imported into midas NFX from all the major CAD programs. The data translation is fluent, efficient and with minimum loss. Supported formats include: Solidworks, Inventor, Solid Edge, Pro-E/Creo, CATIA, Unigraphics, Parasolid, ACIS, STEP, IGES,

CAE Data Import / Export

Sharing of CAE data enables data collaboration, with midas NFX, you can import and export FEA input files in the standard NASTRAN format (.nas; .bdf) and text format.
CAE results can also be exported in standard ASCII format for integration with a 3rd party solvers or post-processors.

Creation & Editing Tools

Midas NFX offers various features and options to create your own geometry from scratch. The tools can be used for creating line, surface and solid geometries. In addition, tools such as Boolean operations, mid-plane extraction, CFD volume creation etc, help you edit your geometry in a very convenient manner. There are also tools to help the engineers check the quality of geometry, locate discontinuous curves, duplicate curves & surfaces, etc.

Simplification Tools

Geometries with excessive detailing can be simplified effectively in midas NFX. Auto-simplification tool automatically detects and removes small holes, edges, faces and round fillets from the geometry. Manual simplification tools enable users to remove or merge selected details with simple mouse clicks. After simplification, the clean geometry will improve mesh quality and shorten calculation time.

Large assemblies

In real-life situations, the scale of the engineering problem can be very large. In some cases the design to be analyzed may stretch across meters in dimensions, weigh hundreds of tons, or have a thousand components. Midas NFX has been tested to handle engineering problems of a large magnitude. The stable and robust work environment and meshing tools have been developed to handle problems of a such nature, right from importing bulky CAD files, generating the mesh for hundreds of components in the large assembly, and then solving and post-processing.

Manual meshing

One of the greatest advantage of midas NFX is that the model doesn’t depends necessarily on solid geometry. For a very challenging geometry, you can first mesh the contour with coarse 2D elements, and then use “2D remesh” function to remesh it so you can get smooth surface meshes.

Then you can you can use “2D to 3D mesh conversion” tool to create your final 3D meshed model.

Standard and hybrid auto-meshing

The high-performance meshing algorithms enable efficient discretization of the geometry. The automatic meshing methods in Midas NFX have been listed below:

  • 2D Meshing: Delaunay Mesher, Loop Mesher, Grid Mesher, Map Mesher
  • 3D Meshing: Default Tetra Mesher, High-Speed Tetra Mesher, Hybrid Mesher, Map-Solid Mesher

Features such as parallel processing, geometry proximity sensor, size control etc. help the user to generate a smooth and accurate mesh while consuming less time and effort.

Hybrid auto-mesher is the evolution of traditional auto-meshers, It generates tetra and hexa mesh and reduce the computation time while increasing the accuracy at the same time.

Element types

With a variety of different elements to choose from, Midas NFX empowers engineers with the ability to model their FEA problems in the most accurate and convenient manner.

  • 1D Elements: Rod (Truss), Bar (Beam), Pipe, Cable
  • 2D Elements: Shell (Plate), Membrane, Surface, Plane Strain, Axi-symmetric, Composite Shell
  • 3D Elements: Tetrahedral, Pentahedral, Hexahedral, Pyramid

For 2D and 3D elements, one can use either linear (first-order) or quadratic (second-order) elements.

Mesh quality and topology check.

Chose one of the 7 mesh quality indicators to spot potential defects of your model. Mesh accuracy problems will never be a headache anymore.

Mesh topological issues such as disconnected nodes, duplicate elements, free edges can also be automatically detected.

Mesh manipulation.

One of the greatest advantage of midas NFX is that the model doesn’t depends necessarily on solid geometry. For a very challenging geometry, you can first mesh the contour with coarse 2D elements, and then use “2D remesh” function to remesh it so you can get smooth surface meshes.
Then you can you can use “2D to 3D mesh conversion” tool to create your final 3D meshed model.

To check if the meshes are correctly connected, you can use “merge nodes” function, which indicates with a blinking indicator where lies the holes.

Load types.

Following types of loading options are available in Midas NFX to facilitate efficient modeling.

  • Static Structural: Force, Gravity, Pressure, Displacement, Torque, Moment
  • Dynamic Structural: Velocity, Acceleration, Force
  • Thermal: Temperature, Heat Flux, Convection, Radiation, Heat Source
  • Fluid: Fluid Inlet, Fluid Outlet, Wall, Velocity, Pressure, Turbulence, Temperature, Heat Flux

The magnitude of these loads can also vary in space, time and frequency. This can be done by assigning spatial, time or frequency functions for the loads.

Constrains.

To emulate the physical conditions of a model effectively, it is essential that the constraints are properly assigned to the FE model.
Some of the default constraints, such as fixed constraint, pinned (hinged) constraint and rotational constraint can be automatically applied in Midas NFX. Individual degrees of freedom (translational & rotational) can also be constrained.
In addition, for models with symmetric geometry and loading conditions, symmetric constraints can be used.

Contacts.

Loads are transmitted to the whole model through elements. However, for an assembly with multiple parts, there are no elements in the gaps between different parts. Therefore, contact definition is needed to transmit loads between parts.

  • Linear Contacts:
    • Welded: Two parts of an assembly are glued/fastened together and behave as one body
    • Bidirectional Sliding: When two parts of an assembly can have a relative sliding motion.
  • Nonlinear Contacts:
    • General: Supports both vertical and horizontal separation.
    • Rough: It is a special type of general contact in which horizontal sliding between the parts is not possible.
    • Welded: Two parts of an assembly are glued/fastened together and behave as one body
    • Bidirectional Sliding: When two parts of an assembly can have a relative sliding motion.