The Computational Domain Effects on Numerical Simulations of Flow-Induced Acoustic Resonance in Blind Side-Branches

Thermal Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava, Vazovova 5, 812 31 Bratislava 1, Slovakia

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Abstract

Flow-induced acoustic resonance is a phenomenon that has been proven to have a negative effect on a wide range of systems. The present study concentrated on numerical simulations of this phenomenon. The emphasis was on the question of whether it is possible to simulate this phenomenon also in computationally less demanding simplified domains without losing important information in the output data. Two geometries were simulated, both detuned (resonance is not expected) and tuned (resonance is expected), with each geometry simulated in both full and simplified forms. The initial detuned case was simulated at velocities of 4 m/s, while the second tuned case was simulated at 20 m/s. The outcome of this investigation was the demonstration that, in both instances, the simplification of the geometry exerted negligible influence on the results. In the second case, the objective was to capture the resonance, which was achieved; however, the accuracy of the resonance frequency values requires experimental verification.