ANALYSIS OF ENERGY SPECTRA BY THE VORTEX METHOD WITH ARTIFICIAL TURBULENCE

Abstract

First, in order to use as an inlet condition for turbulent simulation, a method is presented
which produces numerically an artificial turbulence, namely, a series of velocity fluctuations
of which frequency is Gaussian, and energy spectrum and root mean square correspond to
the given ones. Besides, the fluctuation data are determined by the characteristic parameters
of turbulent flows such as the inlet mean velocity, the kinematic viscosity, the Kolmogorov
scale and the integral time scale. Our examples show excellent accuracy and flexibility of
the method. Secondly, the vortex method has been studied to see the ability of the method
to deal with turbulent flows. It is found that the energy spectra produced by this agree well
with the ones given as the inlet condition, and that the vortex method is able to produce
turbulent flows with the given parameters described above.