Oliver Marquardt

Universität Paderborn, Paderborn, North Rhine-Westphalia, Germany

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Publications (10)0.51 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.
    No preview · Article · Aug 2007 · International Journal of Parallel Emergent and Distributed Systems
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    Oliver Marquardt · Stefan Schamberger

    Full-text · Conference Paper · Jan 2005
  • Stephan Blazy · Oliver Marquardt

    No preview · Conference Paper · Jan 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.
    No preview · Article · Aug 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.
    No preview · Article · Aug 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.
    Preview · Article · Jul 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.
    No preview · Article · Jul 2004
  • Stephan Blazy · Odej Kao · Oliver Marquardt
    [Show abstract] [Hide abstract]
    ABSTRACT: Since the numerical computation of complex three dimensional processes is possible in a reasonable time, there is an increasing demand for flexible and efficient 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 different 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 different techniques.
    No preview · Conference Paper · Jan 2004
  • Stephan Blazy · Odej Kao · Oliver Marquardt
    [Show abstract] [Hide abstract]
    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.
    No preview · Conference Paper · Jan 2004
  • Stephan Blazy · Odej Kao · Oliver Marquardt
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper a new MPI-based framework padfem2 for finite elements methods (FEM) is presented allowing an efficient execution of FEM applications on clusters with SMP nodes. This paper focuses on the global architecture and on an unique parallel data structure for high-performance object management on structured and unstructured grids. The efficiency and scalability of the parallel FEM processing is evaluated using Poisson and Navier-Stokes numerical solvers as an example.
    No preview · Conference Paper · Jan 2003

Publication Stats

14 Citations
0.51 Total Impact Points

Institutions

  • 2003-2007
    • Universität Paderborn
      • Faculty of Computer Science, Electrical Engineering and Mathematics
      Paderborn, North Rhine-Westphalia, Germany