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| Author(s): |
Josuel Kruppa Rogenski
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Ciências Matemáticas e de Computação (ICMC/SB) |
| Defense date: | 2015-10-20 |
| Examining board members: |
Leandro Franco de Souza;
Antonio Castelo Filho;
Luben Cabezas Gómez;
Márcio Teixeira de Mendonça;
William Roberto Wolf
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| Advisor: | Leandro Franco de Souza |
| Abstract | |
Flows over concave surfaces are subjected to centrifugal instability and may transition to turbulence. Studies are conducted to identify the role of the external pressure gradient on the development of the Görtler vortices and their interaction with other flow disturbances. Numerical simulations are carried out by the development and use of an in-house parallel code with highorder of accuracy. Adverse pressure gradient configurations are observed to be more unstable than the neutral and favourable ones. Pressure gradient variations do not prove to be an efficient way to control the centrifugal instability. The destabilizing behaviour that is observed by the adverse pressure gradient justifies its influence on the anticipation of the saturation of the primary vortices and growth of the sinuous and varicose secondary modes. (AU) | |
| FAPESP's process: | 11/08010-0 - Pressure gradient influence in transition flows over concave walls |
| Grantee: | Josuel Kruppa Rogenski |
| Support Opportunities: | Scholarships in Brazil - Doctorate |