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Publications (9)0 Total impact

  • Stephan Blazy, Oliver Marquardt
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    ABSTRACT: In this paper, numerical results of different flow problems for the three-dimensional incompressible Navier–Stokes equations are presented. The problems describe a flow around an obstacle as well as a flow through a system of pipes. Furthermore, chemical species are added in case of the pipe flow. This additionally comprises a transport problem for the introduced species. The numerical approximation is accomplished with a finite element characteristic projection method based on the schemes of Chorin and Vankan. The numerical method for solving the three-dimensional Navier–Stokes equations and the species equations using the parallel adaptive finite element framework padfem are illustrated. Mean values like lift and drag coefficient, pressure decay and species distribution are presented and compared with existing reference values. Finally, some efficiency results of the used solvers are given.
    IJPEDS. 01/2007; 22:257-274.
  • Stephan Blazy, Oliver Marquardt
    Proceedings of the IASTED International Conference on Parallel and Distributed Computing and Networks, part of the 23rd Multi-Conference on Applied Informatics, Innsbruck, Austria, February 15-17, 2005; 01/2005
  • Stephan Blazy, Odej Kao, Oliver Marquardt
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    ABSTRACT: Since the numerical computation of complex three dimensional processes is possible in a reasonable time, there is an increasing demand for flexible and e#cient visualization tool kits. Many tools deal with the representation of scalar data and vector fields. All of them try to reflect realistic impressions of the simulated processes, e.g. natural science problems like fluid flow. In this paper we present a prototype visualization tool, called padviz, which is part of the parallel finite element framework padfem2. We demonstrate di#erent kinds of visualization techniques for fluid flow problems. This comprises the representation of vector fields using glyphs, the characterization of the fluid behavior with streamlines, mapping of scalar data on cutting planes and the particle tracing methods for instationary processes. Several example images are presented to illustrate the characteristics of these di#erent techniques.
    08/2004;
  • Stephan Blazy, Odej Kao, Oliver Marquardt
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    ABSTRACT: In this paper a new framework PMF algorithms is presented allowing an ecient execution on SMP compute nodes. This paper focuses on the global architecture of the framework, on an unique parallel data structure for mesh object management, and on basic and common algorithms for subtasks of a meshing method.
    08/2004;
  • Stephan Blazy, Odej Kao, Oliver Marquardt
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    ABSTRACT: In this paper a new MPI-based framework padfem2 for nite elements methods (FEM) is presented allowing an ecient execution of FEM applications on clusters with SMP nodes. This paper focuses on the global architecture and on an unique parallel data structure for highperformance object management on structured and unstructured grids.
    07/2004;
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    Stephan Blazy, Oliver Marquardt
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    ABSTRACT: In this paper we consider a finite element algorithm solving the three dimensional Navier-Stokes equation using the method of characteristics. The algorithm is based on a splitting scheme using a characteristic pressure correction method. It's well known, that the most expensive part of the characteristic integration scheme consists of the search for the volume that contains the foot of a given characteristic. The present paper considers different techniques for solving this problem and presents a new, efficient formulation of a search algorithm. This algorithm has been implemented based on the parallel data structure provided by the finite element framework padfem2. We present the results that we have obtained applying this algorithm to two well studied flow problems. Furthermore, we show the efficiency of the splitting scheme computed on a massive parallel cluster system.
    07/2004;
  • Stephan Blazy, Odej Kao, Oliver Marquardt
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    ABSTRACT: In this paper a new framework PMFalgorithms is presented allowing an ecient executionon SMP compute nodes. This paper focuseson the global architecture of the framework, on anunique parallel data structure for mesh object management,and on basic and common algorithms forsubtasks of a meshing method.
    Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications, PDPTA '04, June 21-24, 2004, Las Vegas, Nevada, USA, Volume 2; 01/2004
  • Stephan Blazy, Odej Kao, Oliver Marquardt
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    ABSTRACT: Since the numerical computation ofcomplex three dimensional processes is possible in areasonable time, there is an increasing demand forflexible and e#cient visualization tool kits. Manytools deal with the representation of scalar data andvector fields. All of them try to reflect realistic impressionsof the simulated processes, e.g. naturalscience problems like fluid flow. In this paper wepresent a prototype visualization tool, called padviz,which is part of the parallel finite element ...
    Proceedings of the International Conference on Imaging Science, Systems and Technology, CISST '04, June 21-24, 2004, Las Vegas, Nevada, USA; 01/2004
  • Stephan Blazy, Odej Kao, Oliver Marquardt
    Recent Advances in Parallel Virtual Machine and Message Passing Interface,10th European PVM/MPI Users' Group Meeting, Venice, Italy, September 29 - October 2, 2003, Proceedings; 01/2003