Stability of trains under aerodynamic excitation for Addis Ababa Light railway transit (A.A.L.R.T)
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Date
2015-05
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AAU
Abstract
Railway train aerodynamic problems are closely associated with the flows occurring around
train. This work is based on numerical model using Computational Fluid Dynamics (CFD)
approach to obtain the impact of air flow around a train operating in selected scenarios. These
scenarios are train passing each other and train passing through the tunnel. The model of generic
passenger train was developed using CatiaV5 and generated the wind tunnel and applied the
boundary conditions in ANSYS workbench 13.0. The simulation work of the test vehicle and
grid system is constructed by ANSYS-13.0. FLUENT which is the CFD solver and employed in
the present work. In this study, numerical iterations are completed, then after aerodynamic data
and detailed complicated flow structure are visualized
The paper aimed at investigating the aerodynamic impact on a lightweight railway vehicle used
in A.A.LRT. The performed simulation allows measuring the aerodynamic forces on the
vehicles. Numerical prediction of incompressible flow has been performed in AALRT train
moving at a speed of 22.2m/s (80k/hr). Fluent, the CFD code which incorporates - turbulence
model and segregated implicit solver was used for the computation.
The aerodynamic analysis was performed to study the flow behavior of the air over the train
body. The analysis includes the study of contours of pressure and velocity. The peak pressure
difference along the train is 1615KPa which is exhibited for trains passing each other. The two
scenarios conducted for a train exiting and entering the tunnel shows that the pressure deviation
is very low with a magnitude of 1411Kpa and 1355Kp respectively
Description
Keywords
aerodynamic, Stability of trains, AALRT