Philip Ortwein

Room 1.010
Institute of Aerodynamics and Gas Dynamics
Pfaffenwaldring 21
70569 Stuttgart

Research topics

  • Discontinuous Galerkin (DG)
  • Particle-In-Cell (PIC)
  • Maxwell’s equations
  • Implicit time integration
  • Particle-Mesh Coupling
  • High Performance Computing (HPC)


Research description

In PIC schemes, several time step restrictions are encountered. The Maxwell solver is limited by the CFL condition arising from an explicit time integration. Additionally, the particle oscillation has to be resolved. For a cold plasma, the explicit time step of the particles can be several hundreds or thousands of times the time step of the Maxwell solver. Semi-implicit PIC solver treat the Maxwell’s equations implicitly and the particles remain explicit. These schemes offer the advantage of similar time steps for both parts of the PIC solver. Research for the efficient implicit time integration of high-order schemes is still ongoing. Especially, the implicit treatment of purely hyperbolic equation remains a challenge.

In PIC schemes, the particles are treated in a Lagrangian manner and the Maxwell solver is grid based. Efficiency gains of the particle-mesh coupling promises large reductions of computational time. Furthermore, high-order methods required curved meshes. A combined scheme requires the capability of particle tracking algorithms to handle curvilinear meshes. For high-order schemes, the particle-mesh coupling offers a wide opportunity for optimization.



P. Ortwein at ECHR 2017, Stuttgart, Germany

Challenging Applications regarding the Simulation of Microwave Devices Presentation


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P. Ortwein at ICOS 2017, Atlantic City, USA

PICLas: A Highly Flexible Particle Code For The Simulation Of Reactive Plasma Flows Presentation



P. Ortwein at HONOM 2017, Stuttgart, Germany



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P. Ortwein at ICOPS 2016, Banff, Canada

Implicit Time Integration for Particle Treatment within a Particle-in-Cell Solver Presentation


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P. Ortwein at ICOPS 2015, Antalya, Turkey

Three-dimensional High-Order Semi-Implicit Particle-in-Cell Solver based on Discontinuous Galerkin Spectral Element Method Presentation


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P. Ortwein at HONOM 2015, Trento, Italy

Curvilinear Particle-in-Cell Code on Arbitrary, Unstructured Grids Presentation


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P. Ortwein, S.M. Copplestone, C.-D. Munz, A. Marek; J. Jelonnek

Benchmarking a high-order particle-in-cell code for the simulation of a gyrotron traveling-wave tube Inproceedings

pp. 04020, 2017.

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A. Marek, K.A. Avramidis, S.M. Copplestone, N.S. Ginzburg, S. Illy, J. Jelonnek, J. Jin, S.V. Mishakin, A.-S. Müller, P. Ortwein; M. Thumm

Simulation of electromagnetic fields scattered from arbitrary shaped electric conductors Inproceedings

pp. 04016, 2017.

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S. M. Copplestone, P. Ortwein, C.-D. Munz, K. A. Avramidis; J. Jelonnek

Simulation of gyrotrons using the high-order particle-in-cell code PICLas Inproceedings

pp. 04019, 2017.

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S. M. Copplestone; P. Ortwein; C. D. Munz

Complex-Frequency Shifted PMLs for Maxwell's Equations With Hyperbolic Divergence Cleaning and Their Application in Particle-in-Cell Codes Journal Article

IEEE Transactions on Plasma Science, 45 (1), pp. 2-14, 2017.

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W. Reschke; T. Binder; J. Kleinert; A. Mirza; P. Nizenkov; M. Pfeiffer; S. Fasoulas; S. Copplestone; P. Ortwein; C. D. Munz

Recent developments of DSMC within the reactive plasma flow solver PICLas Proceeding

1786 (1), 2016.

Abstract | Links | BibTeX

Copplestone, S.; Binder, T.; Mirza, A.; Nizenkov, P.; Ortwein, P.; Pfeiffer, M.; Fasoulas, S.; Munz, C.-D.

Coupled PIC-DSMC Simulations of a Laser-Driven Plasma Expansion Incollection

Nagel, W E; Kröner, D H; Resch, M M (Ed.): High Performance Computing in Science and Engineering ‘15, Springer, 2016, ISBN: 978-3-319-24633-8.

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Ortwein, P.; Binder, T.; Copplestone, S.; Mirza, A.; Nizenkov, P.; Pfeiffer, M.; Stindl, T.; Fasoulas, S.; Munz, C.-D.

Parallel Performance of a Discontinuous Galerkin Spectral Element Method Based PIC-DSMC Solver Incollection

Nagel, W E; Kröner, D H; Resch, M M (Ed.): High Performance Computing in Science and Engineering ‘14, Springer, 2015, ISBN: 978-3-319-10810-0.

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Munz, C.-D.; Auweter-Kurtz, M.; Fasoulas, S.; Mirza, A.; Ortwein, P.; Pfeiffer, M.; Stindl, T.

Coupled Particle-In-Cell and Direct Simulation Monte Carlo method for simulating reactive plasma flows Journal Article

Comptes Rendus Mécanique, 342 (10-11), pp. 662–670, 2014, ISSN: 1631-0721.

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