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Computational fluid-dynamic model of laser-induced breakdown in air
Ivan G Dors1, Christian G Parigger
1Space Science Center, University of New Hampshire, 39 College Road, Durham, NH 03824, USA.
Applied Optics
|November 5, 2003
Summary
This study models laser-induced plasma dynamics using computational fluid dynamics and kinetics. Results show computed fluid phenomena accurately match experimental observations of laser spark decay.
Area of Science:
- Fluid dynamics
- Plasma physics
- Computational modeling
Background:
- Laser-induced breakdown creates complex plasma phenomena.
- Understanding laser spark decay is crucial for various applications.
- Accurate modeling requires integrating fluid dynamics with chemical kinetics.
Purpose of the Study:
- To develop and validate a computational fluid dynamics model for laser-induced plasma.
- To investigate temperature and pressure profiles during laser spark decay.
- To compare computational predictions with experimental shadowgraph data.
Main Methods:
- Utilized a two-dimensional, axially symmetric, time-accurate computational fluid-dynamic model.
- Incorporated a kinetics mechanism with plasma equilibrium and non-equilibrium reactions.
- Employed high-speed shadowgraph techniques for experimental validation.
Main Results:
- Computed temperature and pressure profiles were obtained for 10-ns laser pulses.
- The model successfully simulated fluid phenomena following laser-induced breakdown.
- Direct comparison showed strong agreement between predicted and experimental flow patterns.
Conclusions:
- The computational fluid-dynamic model accurately captures laser spark decay dynamics.
- The integrated kinetics mechanism is effective for modeling ionized and non-ionized regions.
- This validated model can be used for further research into laser-plasma interactions.