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| Author(s): |
Larissa Alves Petri
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: | 2015-03-09 |
| Examining board members: |
Leandro Franco de Souza;
Igor Braga de Paula;
Oscar Mauricio Hernandez Rodriguez;
Fabrício Simeoni de Sousa;
William Roberto Wolf
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| Advisor: | Leandro Franco de Souza |
| Abstract | |
The presence of protuberances on surfaces, for example, rivets, screws and gaskets, can influence the boundary layer by accelerating the transition from laminar flow to turbulent flow. In some cases this may be undesirable, since the turbulent flow involves frictional forces greater than the ones at the laminar regime. There are some aspects of the flow in the boundary layer perturbed by a single roughness element that are not well understood. The aim of this work is to study the influence of an isolated roughness on the boundary layer. This study is a step towards to the understanding of what can happen in more complex cases. The nature of this study is computational, therefore a Direct Numerical Simulation code is used. The immersed boundary method is used to represent the roughness in the flow on the surface. The numerical code is verified via theMethod ofManufactured Solutions. Comparisons between experimental data, Linear Stability Theory and numerical results are also used for the validation of the code. Results obtained with different roughness heights and variations in the pressure gradient allowed the analysis of the influence of a three-dimensional roughness element in boundary layer flows. (AU) | |
| FAPESP's process: | 10/00880-2 - Direct Numerical SImulation of transitional flow over a roughness |
| Grantee: | Larissa Alves Petri |
| Support Opportunities: | Scholarships in Brazil - Doctorate |