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Effect of surface roughness on nonlinear reflection of weak shock waves
Maria M Karzova1, Thomas Lechat2, Sébastien Ollivier3
1Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russia.
The Journal of the Acoustical Society of America
|December 5, 2019
Summary
Rough surfaces alter shock wave reflections, decreasing Mach stem height and adding pressure waveform oscillations. Despite this, pressures near rough surfaces were found to be higher than those near smooth surfaces.
Area of Science:
- Acoustics
- Fluid Dynamics
- Nonlinear Acoustics
Background:
- Previous research established optical interferometry for studying weak shock reflections from smooth surfaces.
- This study investigates the impact of surface roughness on shock wave reflection phenomena.
Purpose of the Study:
- To extend the understanding of shock wave reflections to include rough surfaces.
- To quantify the effects of surface roughness on shock wave characteristics and pressure waveforms.
Main Methods:
- Utilized a Mach-Zehnder interferometer for precise measurement of pressure waveforms.
- Employed numerical simulations based on the solution of axisymmetric Euler equations for analysis.
Main Results:
- Surface roughness was observed to reduce the height of the Mach stem.
- Pressure waveforms exhibited oscillations when reflecting from rough surfaces.
- Higher pressures were recorded near rough surfaces compared to smooth surfaces.
Conclusions:
- Surface roughness significantly modifies the dynamics of weak shock wave reflections.
- The findings provide insights into the complex interactions between shock waves and irregular surfaces.
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