Based on the Eulerian finite element method(EFEM),an axially symmetric numerical model was established for 2-bubble underwater pulsation.The accuracy of the model and the convergence of the mesh were fully verified by comparison with the unified bubble equation and experimental results.The calculation re-sults show that,the unified bubble equation is more accurate than other bubble theories in predicting the bub-ble dynamic behavior and the pressure load in the flow field.Combined with the EFEM and the unified bubble e-quation,the effects of buoyancy parameter δ and strength parameter e on the coupling law of double bubbles were studied.For buoyancy parameter δ ≤ 0.1 5,the upper bubble will produce a vertical downward jet under the action of the lower bubble,and the lower bubble boundary is like the solid wall boundary.For δ increasing to 0.2,the influence of the lower bubble on the upper bubble weakens,the buoyancy effect becomes more prominent and the jet direction of the upper bubble is vertical upward.Strength parameter ε has no obvious effect on the cou-pling between bubbles,but its effect on the bubble jet velocity decreases significantly for ε ≥ 150.
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