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Institute of Chemical Engineering & High Temperature Chemical Processes (ICE-HT)
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  Title Specialised Software & Support Services: Highly accurate static, harmonic and time domain numerical solutions for two- and three-dimensional acoustic, electromagnetic and elastic problems
  Group Applied Mechanics laboratory, ICE-HT
  Researcher prof. D. Polyzos
  Abstract The FORTH - 4S's software technology is the outcome of long scientific research carried out in FORTH laboratories in the framework of participation in projects of high technological impact. The innovative algorithms implemented for the creation of the computing codes are able to provide solutions of high accuracy to Mechanical engineers for complex problems in the fields of structural integrity assessment, acoustical and noise isolation design and electromagnetic scattering simulation.
  Description Nowadays, Boundary Element Method (BEM) is a well-known and powerful numerical tool for analysing engineering problems. Main advantages offered by the BEM compared to the traditional and most widely used method of finite elements are the reduction of the dimensionality of the problem by one and the automating accounting of the radiation conditions when problems with infinite spaces are considered. Thus, only the boundary of the structure is needed to be descritised and not the boundary plus the interior domain as the Finite Element Method (FEM) does.
These two advantages become more pronounced in three-dimensional problems dealing with structures of complex geometry as well as in wave propagation and wave scattering engineering problems where, although the domains of interest are infinite or semi-infinite, a discretization of the boundary is only required.
The Boundary Element Analysis Program (BEAP) is an advanced user friendly, object oriented boundary element code providing highly accurate static, harmonic and time domain solutions for two and three-dimensional elastic, electromagnetic and acoustic problems, such as:
- Static and dynamic compressible and incompressible linear elastic problems
- Stress analysis
- Thermal stress analysis
- Scattering and emission of stress waves
- Free and forced vibration analysis
- Static and dynamic gradient elastic problems
- Electromagnetic problems
- Electromagnetic scattering by dielectric bodies
- Acoustic problems
- Radiation and scattering of acoustic waves
- Structural acoustics
- Fluid-structure interaction analysis.

The near future enhancements of BEAP include:
- Fracture analysis
- 2D anisotropic and non-linear elastic analysis
- Electromagnetic field analysis.

Basic Characteristics
It is possible the use of 2D and 3D constant, linear, quadratic, partially and fully discontinuous and quarter point elements.
- Very accurate evaluation of stresses (boundary stresses, near to the boundary stresses and internal stresses).
- This is accomplished with the aid of highly accurate techniques of evaluating weakly singular, strongly singular and hyper-singular integrals.
- Treatment of very thin bodies. This is accomplished with the aid of highly accurate techniques of evaluating nearly singular integrals (weakly, strongly and hyper-singular)
- Use of sub-regions for accelerating the solution process.
- Use of Fast Fourier Transform (FFT) for efficient solution of axisymmetric problems.
- Graphical User-friendly Interface (GUI) for pre- and post-processing.
  Current development phase This technology is already available for demonstration and has been successfully tested in several cases.
  Intellectual property rights: Secret Know-How
  Type of collaboration sought Joint Venture Agreement, Technical Co-operation, Commercial Agreement with Technical Assistance.
The group is already in the position to undertake engineering consulting services in order to provide industries with answers and solutions to engineering problems. Studies are carried out either with the aid of its own familiar computer simulation tools or through a combination with commonly used commercial software tools in order the optimum solution to be achieved.