Computational analysis of high frequency fluid–structure interactions in constricted flow

Constricted flow in a thin cylindrical shell with an idealized blunt constriction is modeled using ADINA. Highly disturbed recirculation region is observed at the constriction exit where pressure fluctuations and consequential vessel wall vibrations display broadband spectral content over a range of several hundred Hz. Maximum dynamic pressure and vibration amplitudes are observed around the reattachment point and they gradually decrease along downstream of flow. Results obtained by numerical simulations are compared with relevant studies in the literature and are in good agreement in terms of general spectral behavior. However, the amplitudes were significantly lower as compared to experimental results.

► Modeling constricted flow in a thin cylindrical shell with an idealized blunt constriction.
► Broadband pressure fluctuations and vessel wall vibrations downstream of the constriction exit.
► Maximum dynamic pressure and vibration amplitudes observed at the fluid jet reattachment.
► Results are in good agreement with experimental studies in terms of general spectral behavior.