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Numerical investigation on critical length of impermeable plate below underwater pipeline under steady current

Science China(Technological Sciences) 2013年第6期56卷 1232-1240页

作者： ZHANG ZhiYong SHI Bing GUO YaKun YANG LiPeng College of Engineering Ocean University of China School of Engineering University of Aberdeen

This study proposes a new approach in which an impermeable plate is placed under the pipeline to prevent the local scour around the *** order to understand the performance of this approach,the finite volume method(FVM) and volume of fluid(VOF) method are adopted to simulate the flow field around the *** pressure distribution along the sandy bed surface is obtained by considering the variation of water ***,the effects of water depth,unidirectional and bidirectional impermeable plates on pressure difference are *** seepage flow field of sandy bed near underwater pipeline is numerically simulated using the laminar and porous media *** this basis,the effect of the impermeable plate length on hydraulic gradient is investigated and the critical length of impermeable plate is *** simulated results show that when the water depth is smaller than 5.00D(D is the diameter of pipeline),the effect of the water depth on the pressure difference is *** pressure differences between two endpoints of both the unidirectional and bidirectional plates decrease with the increase of the plate *** variations of the pressure differences for both the unidirectional and bidirectional plates are *** the increase of plate length,the hydraulic gradient decreases and the piping at the seepage exit is avoided effectively as long as it reaches a certain *** a critical length of the plate decreases with the increase of the water *** water depth is larger than 4.00D,the effect of the water depth on the critical length is *** the same water depth,the critical length of impermeable plate increases with the increase of the dimensionless flow *** simulation results are in good agreement with the available experimental measurements.

关键词： underwater pipeline steady current impermeable plate numerical simulation critical length

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