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CAD/CAE Interfaces
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: CATIA, Inventor, ProE/Creo,
Solidworks, Solid Edge, Parasolid, Unigraphics, ACIS, STEP, IGES, etc. Try Interactive Demo
Sharing of CAE data enables data collaboration
Using midas NFX, one can import and export FEA input files in the standard NASTRAN format (.nas; .bdf)
CAE Data can also be exported under text format in order to support the integration with a 3rd party solver. Try Interactive Demo
Geometry Modeling
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, midplane 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. Geometries with excessive detailing can be simplified effectively in midas NFX. Autosimplification 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. Try Interactive Demo
In reallife 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 postprocessing.
Meshing
Manual mesh generation provides to the user the freedom to generate a mesh from scratch, eliminating the need of preparing parametric geometric models.
Options include extrude, sweep, revolve, project, fill and offset 2D mesh profiles into 3D sets.
The user can also divide elements, modify element parameters, or check the quality of the mesh generated.
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: Rod (Truss), Shell (Plate), Membrane, Surface, Plane Strain, Axisymmetric, Composite Shell 3D Elements: Tetrahedral, Pentahedral, Hexahedral, Pyramid
For 2D and 3D elements, one can use either linear (firstorder) or quadratic (secondorder) elements.
The highperformance 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, HighSpeed Tetra Mesher, Hybrid Mesher, MapSolid 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 automesher is the evolution of the automesher. It generates tetra and hexa mesh and reduce the computation time while increasing the accuracy at the same time. Try Interactive DemoChose one of the 7 mesh quality indicators to spot potential defects of your model. Mesh accuracy problems will never be a headache anymore. Try Mesh Quality CheckingMesh topological issues such as disconnected nodes, duplicate elements, free edges can also be automatically detected. Try Mesh Topology CheckingOne 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. Try 2D to 3D RemeshingTo check if the meshes are correctly connected, you can use “merge nodes” function, which indicates with a blinking indicator where lies the holes.
Try Merge Nodes
Loads & Constraints
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.
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.
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.
Materials
Midas NFX provides a database of more than 1000 linear material models, which helps to simulate behavior of almost any kind of material. Based on the caracteristics, materials can be further divided in to linear, elasto plastic, hyper elastic, nonlinear elastic and temperature dependent materials.
The Elastoplastic material is used when stress is between the elastic limit of a material and its yield strength. And the material exhibits both elastic and plastic properties. midas NFX support elastoplastic material model via stressstrain curve, plastic hardening curve and perfect plastic curve. Nonlinear elastic material model can simulate the nonlinear but elastic behavior of the materials. The nonlinear stressstrain relationship is given by a multilinear curve that is defined by a set of points. midas NFX support different types of Hyperelastic models to simulate rubbers (MooneyRivlin, Ogden, BlatzKo, etc.) Direct input of test data to generate the model coefficients is possible.
midas NFX support material models depending on temperature through the input of different material curves. Temperature dependent materials are useful to investigate models highly dependent on temperature like pressure vessels
NFX Working Modes
The Analyst Mode of Midas NFX is a platform for the experienced FEA engineers, who have a deep understanding of its application of tools.
Unlike the designer mode, one can use different types of elements for modeling and also generate mesh manually. There are also tools to create and edit geometry, that can help the user tweak the geometry without the inconvenience of returning to the CAD platform.
The Designer Mode of Midas NFX is a single answer to all engineers who aspire to take that intellectual leap from being a CAD designer to an FEA analyst.
Powerful meshing algorithms complimented by highperformance Midas solvers, makes Midas NFX Designer mode the ultimate tool for novice and amateur engineers. Options such as automatic model simplification, autoupdate and analysis wizard make FEA less cumbersome for even the most advanced FEA users.
Solver
Midas NFX offers a modern multiphysics work environment that enables engineers from different disciplines to analyze their design problems. The following analysis types are available in Midas NFX:
Structural Analysis: Linear Static, Modal, Linear Buckling, Transient Response (Direct & Modal), Frequency Response (Direct & Modal), Nonlinear Static, Nonlinear QuasiStatic, Random Analysis (Direct & Modal), Response Spectrum, Nonlinear Implicit Transient, Nonlinear Explicit Transient Thermal Analysis: Nonlinear Heat Transfer (Steady & Transient), Linear Thermal Stress (Steady & Transient), Nonlinear Thermal Stress (Steady & Transient) Computational Fluid Dynamics: Transient CFD, Steady State CFD
Using stateoftheart algorithms that impart highperformance computability, the solvers available in Midas NFX provide fast, reliable and costefficient analysis, making NFX one of the best in its class.
The different solver types available in Midas NFX are: Structural Analysis: Auto, Multifrontal, Dense, Algebraic Multi Grid (AMG) Computational Fluid Dynamics: Iterative, Multifrontal Parallelprocessing: Midas NFX allows you to utilize the computing power of your hardware to its full potential by supporting multiple cores of your computer at no extra cost.
GPUenabled computing: Use your computer graphical processing unit as a means to boost your computing power. Currently supported hardware included.
Post Processing
No position of the model can hide from the « draganddrop » cutting plane. You can make an easy cut in seconds. Isosurface directly tells you locations where stresses are higher than the allowable value. Need to observe stresses in a few key positions? You can export results at any position into Excel, or you can plot XY graphs directly inside midas NFX. The visual representation of results is one of the biggest strengths of Midas NFX. Powerful postprocessing tools enable easy visualization as well as extraction of results. Some of these tools have been listed below:
 Contour Maps
 IsoSurfaces
 Clipping Planes
 Probe Tool
 Tables
 Graphs
An FE Analysis is always incomplete if the reviewers are unable to interpret the data from the results. A descriptive and a comprehensive report is as essential as any other task that FEA involves.
midas NFX has the provision for automatic report generation. The reports include all the information related to the model, right from the geometry, to the result graphs and tables.
The automatic reports can be generated in MSWord or 3D PDF format. The former can use default or custom templates, whereas the latter, is an interactive report with animated illustrations of the model in a 3D view.
Download a 3D PDF Report Sample
The probe tool let you efficiently vizualize the result you are interested at any node of the model, giving you detailed information about you analysis at any time.
Try Interactive DemoWhat can be more boring than report writing, copypasting all the data and screen captures? This is the part where engineers lose most of the time! With NFX, you can define your own Word Template and automatize the process of data extraction and report creation.


