Portable Parallelization of Industrial Aerodynamic by Anton Schüller

By Anton Schüller

This publication includes the most result of the German undertaking POPINDA. It surveys the cutting-edge of business aerodynamic layout simulations on parallel structures. POPINDA is an acronym for moveable Parallelization of business Aerodynamic functions. This venture began in past due 1993. The examine and improvement paintings invested in POPINDA corresponds to approximately 12 scientists operating full-time for the 3 and a part years of the venture. POPINDA used to be funded through the German Federal Ministry for schooling, technology, learn and expertise (BMBF). The valuable targets of POPINDA have been to unify and parallelize the block-structured aerodynamic movement codes of the German plane and to strengthen new algorithmic ways to enhance the potency and robustness of those courses. The philosophy in the back of those pursuits is that not easy and critical numerical appli­ cations comparable to the prediction of the 3D viscous circulate round complete plane in aerodynamic layout can in simple terms be performed effectively if the advantages of smooth speedy numerical solvers and parallel excessive functionality pcs are mixed. this mix is a "conditio sine qua non" if extra advanced functions reminiscent of aerodynamic layout optimization or fluid constitution interplay difficulties need to be solved. while being solved in a typical business aerodynamic layout approach, such extra complicated purposes even require a considerable extra aid of computing instances. Parallel and vector pcs at the one aspect and cutting edge numerical algorithms resembling multigrid at the different have enabled remarkable advancements in medical computing within the final 15 years.

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Extra info for Portable Parallelization of Industrial Aerodynamic Applications (POPINDA): Results of a BMBF Project

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_-------- -------: ! Multiprocessor systems ! ~ (distributed and shared memory) ~ : :-.. 3: Levels of POPINDA Software. Complex geometries may require some further specialities of block-structured meshes: singularities. In order to avoid that the number of mesh points grows too much with 30 increasing topological complexity of the geometry, there is a need to allow that block boundary segments collapse to lines or even to single points in physical space. For example, a circular mesh in the physical space as it is natural in the inside of flow nacelles has a singularity in the middle of the circle.

G. an exchange of boundary data at block interfaces. Since all these functionalities are realized within separate modules in the sequential mode, portability between sequential and parallel computers is no problem. The difference between the sequential and parallel mode is, that different libraries are linked to the application program and that different routines are used for the communication. Additionally, such a library can be developed almost completely independent of the CFn solver, so that specialists on parallel computing work on its efficient implementation guaranteeing a high degree of reliability.

With the exception of this restriction, the full freedom of blocking is possible. In the definition of the routines of CLIC, care has been taken in order that they are not designed to the special requirements of only one application. This would obviously unnecessarily restrict the range of use. Furthermore, it is important that the library supplies routines for as many communication tasks of the applications program as possible, because otherwise the user has again to write special communication routines.

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