This study of the Kelvin-Helmholtz instability has permitted us to have a better understanding of this phenomenon. Moreover, we proved that it is possible to visualize this instability with the computational fluid dynamic code Fluent5 and the VOF model. The tests realized proved that the code and our results respected the instability mechanisms and that the tests were consistant with the theory. Thanks to our stability study, it was possible to determine the stability limit for a frequency of 5 Hz.
This study was the opportunity to discover the use of the VOF model and also of the User Defined Functions. But it showed the limits of the model by the obligation to force the instability by means of a beater, when placed in the convective conditions. It was not also possible to realize a frequential study, because of resolution and quality problems when the frequency is to low. Moreover, because of the very long time required to perform a calculation, it was not possible to realize as much cases as desired, in order to obtain a stability curve, in function of the frequency.
In conclusion, we can say that despite these problems, the statement of this study is positive.