A numerical study of the fluid-structure interaction of an inclined tangent ogive-cylinder rigid body, mounted on torsion springs that can rotate in the pitching, yawing, and rolling directions, is conducted. The body is subjected to three-dimensional compressible laminar flow at a Reynolds number of 30,000 and a Mach number of 0.2. A second-order implicit finite difference scheme is employed for the flow equations, adapted to a curvilinear coordinate system, whereas the coupled structural equations, written using an Euler angle notation, are solved by a fourth-order Runge-Kutta method. A detailed investigation of two angles of attack, α=40 deg and α=55 deg, is described. For a fixed body at α=40 deg, the yaw moment changed smoothly with the location of the circumferential disturbance, whereas at α=55 deg the yaw moment was characterized by an almost square-wave variation behavior with bifurcation points at disturbance circumferential roll angles [phi]∼90 deg, [phi]∼140 deg, and [phi]∼180 deg. For an elastically mounted body, the response at α=40 deg for all disturbance locations resulted in large-amplitude periodic yawing and pitching moments. The response at α=55 deg resulted in large-amplitude moments, which occurred only for disturbance locations that coincided with the bifurcation points of the fixed body. The response at the bifurcation points was found to be quasi-periodic for [phi]∼90 deg, periodic for [phi]∼140 deg, and nonstationary for [phi]∼180 deg. Presented as Paper 2013-2590 at the 21st AIAA Computational Fluid Dynamics Conference, San Diego, CA, 24-27 June 2013
Fluid–Structure Interaction of an Elastically Mounted Slender Body at High Incidence
AIAA journal ; 53 , 5
2015
Article (Journal)
English