BES Fluent

Instability of Rayleigh-Benard

IV. Conclusion

Our study was based on the comparison between steady and unsteady option. It permits us to understand more sharply the difference between them. We have shown that to obtain the same results with the two methods, we had to iterate a long time with unsteady option because the solution has to be very stabilised.

Therefore, unsteady simulations could last a very long time. That's why, we recommended to use this option only to study transitional state of a phenomenon.

Furthermore, we have studied hydrodynamic instabilities, phenomena that often appear in the current life. We can see that codes like Fluent are able to calculate such instabilities.

Moreover, this BES permits us to use efficiently the code Fluent. We could learn to use the different functions of Fluent like plotting profiles, defining custom field functions or user defined functions.

This gives us an example of a real industrial study and a general idea of how codes are used in industry.
But, we can notice that a physical knowledge is very important for criticizing and validating the methods and the results.