Pressure field and wake modes analysis of an oscillating cylinder

Mandelli, Simone; Muggiasca, Sara; Malavasi, Stefano

doi:10.1016/j.oceaneng.2016.07.042

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Even if the k-ω SST model can also be used without wall functions within the fine mesh close to the solid surfaces of the pantograph, the use of wall functions was preferred to contain the computational effort and to benefit industrial applicability. In principle, the use of wall functions to describe the speed profiles in proximity of the solid surfaces is not preferable when modelling cylindrical geometries ( [23], [24]) since it leads to an underestimation of the aerodynamic coefficients. Nevertheless, for pantograph applications, the forces generated on the components composing the articulated frame are significantly affected by the geometries connected to the extremities of the skewed cylinders, (e.g.…”

Section: Cfd Modellingmentioning

confidence: 99%

Procedure to assess the role of railway pantograph components in generating the aerodynamic uplift

Carnevale

Facchinetti

Rocchi

2017

Journal of Wind Engineering and Industrial Aerodynamics

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Aerodynamic forces play a big role in determining the value of the mean force acting between the collectors of a railway pantograph and the contact wire, especially for speed higher than 200 km/h. The contact force has to be properly calibrated in order to have a good quality collection of power and low wear of contact strips and contact wire. This paper analyses the pantograph features that mainly affect its aerodynamic behaviour, and their influence on the mean value of the contact force. Wind tunnel experimental tests on a full-scale pantograph and Computational Fluid Dynamic (CFD) simulations in a wind tunnel scenario are carried out for different pantograph configurations, and the contribution of each different part of the pantograph to the mean contact force is investigated. To this end, the feasibility of using the RANS model and steady state simulations is evaluated

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Section: Cfd Modellingmentioning

confidence: 99%