Method for dynamic boundary setting in numerical modeling of free-surface-pressurized flow for outlet gate of long inverted siphon
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Abstract:
The Menglour Qifang inverted siphon is 72 km long in the north Hubei water diversion project.. The setting of the out let boundary under the control of its gate has a significant impact on the hydraulic response process in the pipe. The super-long inverted siphon out let gate is located at the junct ion of the pressure section and the open channel set ion. It belongs to the orifice submerged outflow of the long pressure pipeline and has the characteristics of high coupling and nonlinearity. The commonly used pressure tunnel discharge formula does not consider the unsteady flow in the inverted siphon and is not suitable as the out let boundary of the long inverted siphon.The Henry formula can reasonably reflect the hydraulic response law under the gate control, but it is difficult to reflect the vibration characteristics of water hammer. On this basis,a boundary treatment method for ulverting the exit gate was proposed, the simulation results revealed that there was significant water hammer during rapid closing in the inverted siphon, the maximum water hammer pressure in the downstream accident conditions was 25.1m(the initialpressure was 8.8m), the maximum water hammer amplitude is 16 m, and the average pressure variation characteristics are consistent with similar experimental results.The proposed method can provide technical support for the int ervention schedule in the water transfer project in northern Hubei and is also a reference for similarly dynamic boundary simulation modeling in the free surf ace pressurized flow.
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