Free form approach
SOLIDO offers a more correct simulation compared to an approximation with
rectangular blocks (as in TRISCO).
- Conduction: better correspondence to material
quantity and shape.
Rounded forms approximated by rectangular blocks introduce (incorrect) 3D
effects at inner and outer block corners.
- Convection: the areas of contact surfaces are
magnified (up to circa 40 %) by transition to rectangular blocks.
This error is not reduced by grid refinement.
- Radiation: view factors are determined by surface
Rectangular blocks have only orthogonal surface orientations (along
coordinate axes). Grid refinement does not resolve the problem.
- An object is modelled in SOLIDO with blocks, using
the same superposition rule as in TRISCO.
- A SOLIDO block is a generalised TRISCO
block, in which the eight vertices can get free independent positions.
This allows new shapes (e.g. some with coincident vertices): prism,
pyramid, parallelepiped and other.
- The corners around vertices can be rounded to form solids with
quadratic surfaces: sphere, cylinder, cone, hypar shell and other.
- SOLIDO blocks can also refer to STL files as exported from CAD systems (e.g. AutoCAD).
- STL (Stereolithography Tessellation Language) is the standard data
format used in rapid prototyping. STL is a
"watertight" model of a (complex) 3D body,
triangulation of the body surface.
- The point coordinates of a STL file can be transformed in SOLIDO to
adjust the position of the STL block in the global scene.
- Linked to colours of blocks.
- Material properties with extensive material database.
- Boundary conditions at material surfaces, material interfaces, inside
materials (volumetric heat source).
- Improved simulation of separated radiation (using view factors) and convection
(function of difference between local surface temperature and air
temperature) by use of
- Automatic calculation of thermal properties for air cavities
in accordance with international standards.
- SOLIDO uses a rectangular mesh with node fitting to the
true object geometry.
- The user defines a 3D rectangular grid (comparable
to grid in TRISCO).
The grid can be equidistant based on a given
resolution and then be optimised to minimise the number
- The object is rasterised in relation to the
calculation grid to obtain a rectangular
approximation (see left picture).
- The node coordinates at the outside surfaces or in the interfaces
between different colour regions are fitted unto the original
surfaces, to achieve a close match to the original
after node fitting
- The system of equations is formulated to have the
same favourable characteristics as in TRISCO (sparse positive definite
linear system). By this the solution is as
fast and stable as in TRISCO.
- The method is validated against analytical
solutions and is far better than the rectangular approximation.
- 512 Mb RAM can solve about 1 million nodes.
2 Gb RAM can solve about 6 million nodes.
- High resolution output
All graphic output can be saved and printed in any user defined bitmap size.
- Object clipping
The object can be clipped at any grid plane to achieve a cross section
or a perspective view of an object cutout. Also
materials of given colours can be clipped away.
- SOLIDO is designed as major product enhancement of
See upgrade info.
- SOLIDO can read BISCO
- Download Physibel demo programs and manuals (14 Mb).