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Effect of Mutual Interference of Bridge Piers on Scouring in Meandering Channel

Hydro Science & Marine Engineering 2022年第2期4卷 1-9页

作者： Mohammad Athar shamsul azam Humaira Athar Civil Engineering Department A.M.UAligarhU.P.India M.Tech.A.M.U AligarhU.P.India Innovative Building Materials Division CSIR-Central Building Research InstituteRoorkeeUttarakhandIndia

Local scour is the reduction of original bed level around any hydraulic structure.Bridge failure due to scouring has made researchers study the cause of scouring and predict the scour depth and pattern around bridge piers and foundations.Several investigators have extensively studied local scour around isolated bridge pier,but modern designs of the bridges comprise of wide span and thus group of piers rather than a single pier.The flow and scour pattern around group of piers are different from the case of a single pier due to the interaction effect.The objective of present study is to investigate the effect of mutual interference of bridge piers on local scour experimentally around two piers in non-cohesive bed.Experiments were carried out on model bridge piers of circular cross section in a meandering channel.It was observed that when front and rear piers were placed at an angular displacement ofθ=40°and 80°respectively,maximum depth of scour is maximum.Hereθis the angle the line drawn at the inlet of bend to the line joining the centre of curvature and any point on the outer portion of the bend.

关键词： Local scour Bridge piers Scour depth Meandering channel Angular displacement

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High Order Central Schemes Applied to Relativistic Multi-Component Flow Models

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Applied Mathematics 2014年第8期5卷 1169-1186页

作者： Tayabia Ghaffar Muhammad Yousaf Saira Sultan shamsul Qamar Department of Mathematics COMSATS Institute of Information Technology Islamabad Pakistan Department of Mathematics Quaid-i-Azam University Islamabad Pakistan

The dynamics of inviscid multi-component relativistic fluids may be modeled by the relativistic Euler equations, augmented by one (or more) additional species equation(s). We use the high-resolution staggered central schemes to solve these equations. The equilibrium states for each component are coupled in space and time to have a common temperature and velocity. The current schemes can handle strong shocks and the oscillations near the interfaces are negligible, which usually happens in the multi-component flows. The schemes also guarantee the exact mass conservation for each component, the exact conservation of total momentum, and energy in the whole particle system. The central schemes are robust, reliable, compact and easy to implement. Several one- and two-dimensional numerical test cases are included in this paper, which validate the application of these schemes to relativistic multi-component flows.

关键词： Multi-Component Flows Relativistic Euler Equations Central Schemes Higher Order Accuracy

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