The invention discloses a fluid-
solid-sound
coupling calculation and
noise reduction method for a bent
pipe, and belongs to the technical field of pipeline testing. According to the method, the three-dimensional
physical model of the bent
pipe is constructed, the bent
pipe fluid-
solid coupling model is established, and the dynamic correlation between the flowing characteristics of fluid in the bent pipe and the response of a
solid structure is accurately reflected; the method can capture flow field disturbance caused by
inertia,
centrifugal force and geometric changes of the
elbow pipe in the flowing process, quantitatively describes a dynamic load change rule applied by fluid to the pipe wall, effectively improves understanding of complex
elbow pipe flow field behaviors, extracts wall
surface pressure distribution data, generates fluid disturbance data, and improves the flow field performance of the
elbow pipe. According to the method, the distribution characteristics of
noise sources generated by flow-induced vibration can be accurately predicted, the problem that a traditional single-field modeling method cannot fully describe actual working conditions is solved on the whole, the physical authenticity and prediction precision of
simulation are greatly improved, and the problems of high cost and low efficiency caused by a traditional
trial and error method are effectively avoided.