Systematic study of the correlation between geometrical disturbances and flow asymmetries

Autor:	Lambertus Hesselnik, Yuval Levy, David Degani
Rok vydání:	1996
Předmět:	Physics Computer simulation Angle of attack media_common.quotation_subject Aerospace Engineering Mechanics Vortex shedding Ogive Asymmetry Physics::Fluid Dynamics Convective instability Flow (mathematics) Cylinder media_common
Zdroj:	AIAA Journal. 34:772-777
ISSN:	1533-385X 0001-1452
Popis:	Recently, large efforts were directed to numerical simulations of high-incidence flows around slender bodies of revolution to gain more insight into the problem of flow asymmetry. One of the significant advantages in using numerical simulation to investigate these flows is the ability to obtain a disturbance-free base solution. This base solution can then be perturbed for parametric studies of controlled disturbances. The experimentally observed asymmetric flow is numerically simulated by the introduction of a simulated disturbance (bump) placed near the body apex. A series of asymmetric flows over an ogive cylinder at a high angle of attack is computed by systematically varying the bump size. The results reproduce the experimentally observed effect of nose imperfections on flow asymmetry and are used to demonstrate the role of the sectional side force variation along the body. Analysis of the numerical results and the correlation between the disturbances and the asymmetric flow point to a convective instability mechanism as the origin of flow asymmetry.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::20ce75a4755444a5bd03f3e10f9a6acb https://doi.org/10.2514/3.13139 Zobrazit plný text záznamu