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Wind and Structures
  Volume 4, Number 4, August 2001 , pages 333-352

Application of a descrete vortex method for the analysis of suspension bridge deck sections
J. Taylor and M. Vezza(U.K.)rn

    A two dimensional discrete vortex method (DIVEX) has been developed to predict unsteadyrnand incompressible flow fields around closed bodies. The basis of the method is the discretisation of thernvorticity field, rather than the velocity field, into a series of vortex particles that are free to move in thernflow field that the particles collectively induce. This paper gives a brief description of the numericalrnimplementation of DIVEX and presents the results of calculations on a recent suspension bridge deck section.rnThe predictions for the static section demonstrate that the method captures the character of the flow fieldrnat different angles of incidence. In addition, flutter derivatives are obtained from simulations of the flowrnfield around the section undergoing vertical and torsional oscillatory motion. The subsequent predictionsrnof the critical flutter velocity compare well with those from both experiment and other computations. Arnbrief study of the effect of flow control vanes on the aeroelastic stability of the bridge is also presented and thernresults from DIVEX are shown to be in accordance with previous analytical and experimental studies. Inrnconclusion, the results indicate that DIVEX is a very useful design tool in the field of wind engineering.
Key Words
    vortex method; numerical modelling; bridge aerodynamics; flutter derivatives; flow control.
I.J. Taylor, Department of Mechanical Engineering, University of Strathclyde, Glasgow G1 1XJ, Scotland, U.K.rnM. Vezza, Department of Aerospace Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, U.K.

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