[en] A 'channel' model was developed for the purpose of simulating the interactive fluid-structural response of curved pipes to pressure pulses. Simulation is shown to have been achieved analytically in both the axisymmetric ('breathing') and transverse ('bending') modes of interactive behavior. An experimental program which was aimed at the validation of the model is also described. Tests were run in both straight and curved pipe configurations. Comparisons between measurements and model calculations demonstrate the validity of the model within the range of parameters under consideration. The model was implemented into the DISCO code for nonlinear fluid-shell interaction. (orig.)

[en] This study is concerned with modelling the coupled dynamics of fluid-filled curved pipes subjected to extreme impulse loads. In contrast with current quasi one-dimensional models, the present model is capable of simulating the effects of streamline curvature in the fluid, taking full account of fluid-pipe interaction. Comparison with experiments and with other calculations is included. The model is implemented in the two-dimensional lagrangian code DISCO for fluid-shell interaction, which has a built-in capability for treating a multiple-branched shell. This feature has proven very efficient in representing the infra-structure and the conduit as a branching shell. Two tests for the validity of the model were carried out. The first was a numerical test which compared predictions of the model with axisymmetric three dimensional calculations for a straight pipe. A very satisfactory agreement was found between the pressure and strain time-histories. (orig.)