variavel0=<b>YOSHIFUMI OGAMI</b> - ogami@cfd.ritsumei.ac.jp Ritsumeikan university
<b>Abstract.</b> 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 used, where the vortex strength is determined by the series of velocity fluctuations obtained by the above-mentioned method. It is found that the energy spectrum produced by this agrees well with the one given as the inlet condition, and thus the vortex method is able to produce turbulent flows with the given parameters described above.
<b>Keywords.</b> Vortex Method, Turbulence, Energy Spectrum, LES Model.