| Full text | |
| Author(s): |
Freire, Cesar M.
;
Meneghini, Julio R.
;
Gioria, Rafael S.
;
Assi, Gustavo R. S.
;
Theofilis, V
;
Soria, J
Total Authors: 6
|
| Document type: | Journal article |
| Source: | INSTABILITY AND CONTROL OF MASSIVELY SEPARATED FLOWS; v. 107, p. 6-pg., 2015-01-01. |
| Abstract | |
The helical strake is a device commonly employed for vortex-induced vibration attenuation or suppression. It works by changing and affecting the flow patterns around a circular cylinder and, thereby, reducing the interaction of the shear layers formed in this massive separated type of flow. In this paper the wake of vortices generated by a bare circular cylinder is compared to the wake generated by a circular cylinder fitted with helical strake with pitch equal to ten cylinder diameters and height equal to 0.2 of the cylinder diameter. Besides the analysis of the measured velocity field, a Koopman decomposition is made and the most energetic modes obtained for each condition are compared. The Reynolds number for the visualizations is Re = 10,000. (AU) | |
| FAPESP's process: | 10/00053-9 - Vortex-induced vibration with two degrees of freedom and interference effect |
| Grantee: | Cesar Monzu Freire |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 13/05792-2 - Study on the control of massive separated flows case study: helical strakes as a vortex-induced vibrations suppressor |
| Grantee: | Cesar Monzu Freire |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |