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The paper deals with a numerical analysis of an aero-elastic system wherein the flow-structure interaction is taking place in its entire complexity. It is addressed to flow- induced vibrations and other response types termed as flutter or divergence, which arise due to fluctuating fluid forces and movement of the vibrating body. These phenomena are in- vestigated on two different types of a slender beam cross-section. This strategy enables to model the body as a double-degree of freedom (DDOF) system. The paper demonstrates a determination of aero-elastic behavior of the body before and within the critical state. The at- tention is paid to the elastic stiffness, damping and other DDOF system parameters influence on the type and shape of aero-elastic stability limits. The question of aero-elastic stability with regard to external disturbances is discussed as well. The relevant bifurcation points and hysteresis in response loops as functions of the wind speed are identified. A separation curve emerges within the hysteresis loop dividing the space into trivial and post-critical regimes. The results obtained using numerical approach are described and widely interpreted physi- cally. Extensive comparison with results obtained by both (i) analytical investigation and (ii) wind tunnel experiments is presented.

ANALYSIS OF STABILITY CONDITIONS OF A SLENDER BEAM UNDER WIND EFFECTS USING NUMERICAL MODEL