전산유체역학기법과 수충격 해석을 이용한 파손 상수관로 복구 방안의 안전성 검토 : 사례 연구

초록

The purpose of this study were to examine the safety and appropriateness of water pipe repair construction methods and to suggest these methodology as a standard. In this study, the flow field force applied to nine pipe wall segments was calculated using the Computational Fluid Dynamics (CFD) technique for a case of repairing a water pipe breaks. In addition, the temporal change in pressure head at key points (K_tank junction, D_junction, S_tank junction) on the connecting pipeline was simulated through water hammer analysis. The CFD simulation results showed that the pressure inside the bend was lower, and the pressure outside the bend was relatively higher than that in other parts. This can be explained by the phenomenon of dynamic effects transfer due to the flow velocity in the pipe. The water hammer analysis results showed that when the valve closing time was 30 sec, the pressure head at the branch point adjacent to the closed valve increased by up to 150 m. In conclusion, in the case of the water pipe under study, a water hammer phenomenon may occur due to the sudden closure of the S_water tank inlet valve. If the current valve operation status does not allow for control of the valve opening over time, it is necessary to examine a method of controlling the valve closing time by installing an actuator.

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