Identification of aeroelastic parameter of flexible bridge decks by random discrete vortex method

摘要

The boundary element method and the generalized Biot-Savart integral are used to determine effectively the surface vorticity about a group of parted of bodies (multi-bodies) in two-dimensional viscous incompressible flow. The solution to the unknown surface vorticity is made unique by imposing the principle of conservation of total vorticity all bodies as well as each body. The vortex transport equation (VTE) is solved by two fractional step method. The aerodynamic coefficients, aerodynamic derivatives and critical wind speed for the onset flutter are evaluated using the random discrete vortex method for the bridge deck of Second Nanjing Bridge, Runyang Bridge, Belt East Bridge, Jinsha Bridge and Humen Bridge. Fair agreement is established between the present simulation and wind tunnel test results.