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Published in:
2010 | OriginalPaper | Chapter
Spectral and Physical Forcing of Turbulence
Authors : Zafer Zeren, Benoît Bédat
Published in: Progress in Turbulence III
Publisher: Springer Berlin Heidelberg
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Spectral and physical forcing algorithms to generate stationary isotropic turbulence are compared in terms of characteristics of turbulence. Homogeneous isotropic turbulence is first validated with the stochastic forcing algorithm using a different shell of wavenumbers. Linear forcing algorithm is then applied to the generated stochastic field to keep the characteristics of turbulence stationary in time. Linearly forcing is very fast because there is no need to transform from a spectral to physical space. However, levels of fluctuations are very high that very long duration for simulations needed to achieve robust statistics.