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Dynamic Material Parameters in Molecular Dynamics and Hydrodynamic Simulations on Ultrashort-Pulse Laser Ablation of Aluminum

Scharring, Stefan and Patrizio, Marco and Eckel, Hans-Albert and Roth, Johannes and Povarnitsyn, Mikhail (2016) Dynamic Material Parameters in Molecular Dynamics and Hydrodynamic Simulations on Ultrashort-Pulse Laser Ablation of Aluminum. In: Conference-DVD. High Power Laser Ablation / Directed Energy 2016, 3.-7. Apr. 2016, Santa Fe, New Mexico.

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Abstract

Recent developments on the open-source Molecular Dynamics Code IMD from the Institute of Functional Materials and Quantum Technologies at Stuttgart University are reported. Whereas IMD supports laser ablation comprising the Two-Temperature Model by default, reliable simulation data mainly can be found for the femtosecond regime, since laser-matter interaction is implemented by the Lambert-Beer law solely. For laser-matter interaction in the picosecond regime, IMD algorithms were modified in order to enable the dynamic recalculation of the dielectric permittivity of each FD cell for every timestep following the corresponding implementation in the open-source hydrodynamic code Polly-2T from the Joint Institute of High Temperatures at the Russian Academy of Sciences, Moscow. Thus, optical changes in material and jet due the temporal evolution of temperature, density and mean charge are taken into account. Moreover, as implemented in Polly-2T as well, a dynamic model for the thermal conductivity of the electron gas is introduced in IMD to consider effects for a wide range of temperatures. Thus, hydrodynamic (HD) and Molecular Dynamics (MD) simulations are compared extracting the residual effects of the different model approaches which persist in a particle-based method (IMD) using an Embedded-Atom potential (EAM) and a finite cell based approach (Polly-2T) employing the semi-empirical equations of state (EOS) including ionization. Simulation results are compared with experimental results and literature data.

Item URL in elib:https://elib.dlr.de/103830/
Document Type:Conference or Workshop Item (Poster)
Title:Dynamic Material Parameters in Molecular Dynamics and Hydrodynamic Simulations on Ultrashort-Pulse Laser Ablation of Aluminum
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Scharring, StefanStefan.Scharring (at) dlr.deUNSPECIFIED
Patrizio, MarcoUNSPECIFIEDUNSPECIFIED
Eckel, Hans-AlbertHans-Albert.Eckel (at) dlr.deUNSPECIFIED
Roth, Johannesjohannes (at) itap.physik.uni-stuttgart.deUNSPECIFIED
Povarnitsyn, Mikhailpovar (at) ihed.ras.ruUNSPECIFIED
Date:3 April 2016
Journal or Publication Title:Conference-DVD
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Laser ablation, Ultrashort laser pulses, Two-Temperature model, Hydrodynamic simulation, Molecular dynamics
Event Title:High Power Laser Ablation / Directed Energy 2016
Event Location:Santa Fe, New Mexico
Event Type:international Conference
Event Dates:3.-7. Apr. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Studies and Concepts
Deposited By: Scharring, Stefan
Deposited On:20 Apr 2016 10:53
Last Modified:10 Apr 2017 12:22

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