Room 0.024

Institute of Aerodynamics and Gas Dynamics

Pfaffenwaldring 21

70569 Stuttgart

Germany

?@iag.uni-stuttgart.de

**Research topics**

- Discontinuous Galerkin (DG)
- Particle-In-Cell (PIC)
- Maxwell’s equations
- Perfectly Matched Layer
- Laser Plasma Interaction
- Coupled PIC-DSMC Simulations
- High Performance Computing (HPC)

# Research description

The process of laser ablation is gaining a more fundamental role in solid-state physics and material processing. Therefore, numerical studies of laser-solid interaction have been of special interest in the past. These investigations were, however, restricted to direct interactions and the effects on the solid body for which MD simulations were applied. The expansion of the plasma, which is created directly after the laser pulse impacts onto the surface, is also of importance due to subsequent events, e.g., laser-plasma interaction or the contamination of the solid body. These events have considerable influence on additional laser impacts, but have commonly been neglected in simulations conducted in the past.

The mesoscalic simulations in the project allow for an analysis of the plasma plume expansion after a laser impact and can therefore be used for the investigation of subsequent plasma-laser interaction. For this interaction, the laser pulse needs to be modeled numerically in form of electromagnetic waves and has to be incorporated in the method. The results of future simulations are then of interest for further MD simulations, because of the damping effect of the plasma on the laser pulse. This may change the environmental conditions of the laser-solid interaction process and additionally experimental comparisons may be conducted.

# Presentations

## 2016 |

PICLas: A Highly Flexible Particle Code for the Simulation of Reactive Plasma Flows Presentation 27.10.2016. |

PIC-DSMC Simulations of Plasma Plume Expansions with Ionization and Recombination processes Presentation 20.06.2016. |

High-Order Discontinuous Galerkin Methods: An Introduction Presentation 07.03.2016. |

## 2015 |

Coupled PIC-DSMC-Simulation of Laser Driven Ablative Gas Expansions Presentation 16.09.2015. |

Complex-Frequency Shifted Perfectly Matched Layers with Respect to Particle Treatment in a Particle-in-Cell Scheme Presentation 25.05.2015. |

Coupled PIC-DSMC-Simulation of Laser Driven Ablative Gas Expansions Presentation 24.03.2015. |

# Publications

## 2017 |

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. |

## 2016 |

1786 (1), 2016. |

Recent developments of DSMC within the reactive plasma flow solver PICLas Proceeding 1786 (1), 2016. |

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. |

## 2015 |

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. |