The spectrum of turbulence
Abstract
A nonlinear electric circuit which produces signals similar in power spectrum to the velocity fluctuations of the turbulent boundary layer on a flat plate is described and demonstrated. The input signal is rectified by a diode, and the output signal is fed to an FFT analyzer and plotted. The outputs resulting from inputs of two or three square waves of equal amplitude and similar frequency are shown to be similar to turbulent-boundary-layer spectra, suggesting that a small number of instability waves of similar frequency may give rise to the spectrum of turbulence.
- Publication:
-
Kyushu University Research Institute Applied Mechanics Reports
- Pub Date:
- February 1984
- Bibcode:
- 1984KyUAM..31...85T
- Keywords:
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- Power Spectra;
- Sine Waves;
- Spectral Methods;
- Turbulence;
- Flow Velocity;
- Rectifiers;
- Turbulent Boundary Layer;
- Fluid Mechanics and Heat Transfer