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Code_Aster, free CAE software based on finite elements
 

Code_Aster is a software for finite element analysis and numerical simulation in structural mechanics and multiphysics.

Code_Aster feature:

- Type FEM : Linear & non-linear static / dynamic, thermal & fluid analysis
- Type of License : GPL
- Developer : Electricite de France (EDF)
- Download : Code_Aster
 

It was developed by the French company Electricite de France (EDF), for the study and maintenance of plants and power grids. He was released under the GNU General Public License in October 2001. Most documentation is available in French.

Code_Aster is a solver or processing engine, i.e. it does not include preprocessing and post - processing tools. This means that meshing and presentation of the solutions must be realized using other softwares for instance SALOME and ParaView respectively. In this regard, the version SALOME-MECA allows full functionality.

Their  applications span multiple disciplines: mechanical, thermal analysis, hydrodynamics, metallurgy, hydration, drying ...  Stationary or transient conditions, and both linear and nonlinear processes can be modelled. It also includes specific tools for fatigue, deformation, fracture, contact, geotechnics, porous materials, etc.


Code_Aster contains 1500000 lines of source code, mostly in Fortran and Python, and is constantly being developed, updated and improved with new models. The qualitative standards required by the nuclear industry have provided improvements to reach the highest levels of functionality and accuracy, which have been validated by independent comparisons with analytical and experimental results.

The software is provided with about 2000 test, dedicated to elementary grade, and are useful as examples. Code_Aster documentation includes over 14000 pages. Most of this documentation is only in French language.


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- Code Aster online course
 
Published 2016-04-14 12:56:15 by | Open
 
Hull modeling using Rhinoceros 3D
 
The most common way to model a 3D hull is using its plane forms. A plane form represents the water lines, as well as the longitudinal and transverse vertical sections. 



Plane forms of a small fishing ship.

By symmetry, only half ot the shift is drawn in the plane forms.

The most appropiate softwares for 3D modeling of the hull are Maxsurf and Rhinoceros, both work from NURBS surfaces. NURBS (acronym for non-uniform rational B-spline) is a mathematical model widely used to generate and represent curves and surfaces

The advantages of the 3D modeler Rhinoceros, are its facility to handle and its versality to adjust the geometry of the hull. It also has tools for smoothing the hull (fairing), which is essential for a good 3D modeling and can be used later in the phase of numerical analysis.

Rhinoceros 3D was created by Robert McNeel & Associates. Recently, it has become popular in different industries, due to its multiple functions and relative low cost. It includes extensive import and export options since it is compatible with many softwares. Several additions (add-ons) are available, also developed by Robert McNeel & Associates, photorealistic rendering for raytracing (Flamingo) and KeyShot, photorealistic rendering non (Penguin) and animation (Bongo).

The version RhinoMarine is adapted to the special characteristics required by naval designers including windbreaks, developable surfaces, curvature analysis, etc. In addition, RhinoMarine has the Orca3D supplement, an external plug-in that provides a full suite of specialized tools for shipbuilding design and analysis in Rhino.

An easy procedure to model a hull using Rhinoceros 3D is indicated below:
  • In Rhinoceros, it is possible to use a bipmap image as background. Using this image, it is possible to realize the plane forms. 
  • These curves can be used to generate NURBS surfaces corresponding to the true forms of the hull. 
  • Rhinoceros has a very useful tool "surface from network of curves". We can not use the curves that do not meet all conditions of validity. It is neccesary to selected curves intelligently to represent hull shapes.
  • It is neccesary to reconstruct and smooth NURBS surfaces.
 
Published 2016-04-11 11:42:11 by Carlos Rodríguez & Joshua | Open
 
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