Based on the arbitrary Lagrangian-Eulerian (ALE) dynamic mesh technique, gas-liquid two phase flow induced vibration (GLTP-FIV) in horizontal elbows was investigated numerically with the multi-fields coupling FE software ADINA. The vibration response characters and the effect of flow regime, volume void fraction(VVF) and phase superficial velocity (PSV)on excitation forces were discussed. The results show that the dynamic response corresponds to a combination of low-frequency band random vibration and periodic vibration. The predominant frequency increases with the rise of PSV. The root mean square of excitation forces (F-RMS) increases gradually when the flow regime is in bubbly,slug and annular flow. For a given two phase mix averaged velocity, F-RMS decreases with increasing VVF when it is in 60%-100%. And F-RMS also increases with rise of PSV. Finally, mechanisms of GLTP-FIV
in elbows are summarized by establishing the mathematical model.And some vibration reduction measures are presented.
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