Impact of bogie cavity shapes and operational environment on snow accumulating on the bogies of high-speed trains
TL;DR: In this paper, the effects of the shape of the bogie cut outs, the running speed of high speed trains and the snow particle density and diameter on the snow accumulation and particle movement characteristics were investigated.
About: This article is published in Journal of Wind Engineering and Industrial Aerodynamics.The article was published on 2018-05-01. It has received 30 citations till now. The article focuses on the topics: Snow & Bogie.
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TL;DR: In this article, an improved delayed detached eddy simulation (IDDES) method based on shear-stress transport k-ω turbulence model has been used to investigate the slipstream and wake flow around a high-speed train with different bogie fairings at Re
45 citations
TL;DR: In this article, the authors used the delayed detached-eddy simulation (DDES) method to calculate the aerodynamic characteristics of 1/8th scaled HST models with differently simplified bogies under crosswinds.
39 citations
TL;DR: In this article, the authors present a numerical investigation of unsteady aerodynamic performance of a high-speed train with different configurations of bogie fairings using an improved delayed detached-eddy simula.
Abstract: This work presents a numerical investigation of unsteady aerodynamic performance of a high-speed train with different configurations of bogie fairings using an improved delayed detached-eddy simula...
18 citations
TL;DR: In this paper, the effects of the rotation of wheels, shape of fairings and length of the cavity on the flow characteristics and snow accumulation around the bogie regions were investigated using the unsteady Reynolds-Averaged Navier-Stokes simulations coupled with the Discrete Phase Model (DPM).
15 citations
TL;DR: In this article, the influence of water spray from wheels on the ice accumulation in the bogie regions of high-speed train has been studied using the coupling numerical methods of improved delayed detached eddy simulation (IDDES) and Lagrangian Model.
12 citations
References
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TL;DR: In this article, a new k -ϵ eddy viscosity model, which consists of a new model dissipation rate equation and a new realizable eddy viscous formulation, is proposed.
4,648 citations
TL;DR: In this article, the authors describe a theoretical investigation into the response of a spherical particle to a one-dimensional fluid flow, and the motion of the spherical particle in a uniform 2D fluid flow about a circular cylinder.
Abstract: This paper describes a theoretical investigation into (i) the response of a spherical particle to a one-dimensional fluid flow, (ii) the motion of a spherical particle in a uniform two-dimensional fluid flow about a circular cylinder and (iii) the motion of a particle about a lifting aerofoil section. In all three cases the drag of the particle is allowed to vary with (instantaneous) Reynolds number by using an analytical approximation to the standard experimental drag-Reynolds-number relationship for spherical particles.
2,401 citations
Book•
01 Jan 1995
TL;DR: A Thomas's algorithm for the solution of a tridiagonal system of Equations is described in this paper, as well as a detailed discussion of the future of Computational Fluid Dynamics.
Abstract: Part I*Basic Thoughts and Equations 1 Philosophy of Computational Fluid Dynamics 2 The Governing Equations of Fluid Dynamics Their Derivation, A Discussion of Their Physical Meaning, and A Presentation of Forms Particularly Suitable to CFD 3 Mathematical Behavior of Partial Differential Equations The Impact on Computational Fluid Dynamics Part II*Basics of the Numerics 4 Basic Aspects of Discretization 5 Grids and Meshes, With Appropriate Transformations 6 Some Simple CFD Techniques A Beginning Part III*Some Applications 7 Numerical Solutions of Quasi-One-Dimensional Nozzle Flows 8 Numerical Solution of A Two-Dimensional Supersonic Flow Prandtl-Meyer Expansion Wave 9 Incompressible Couette Flow Numerical Solution by Means of an Implicit Method and the Pressure Correction Method 10 Incompressible, Inviscid Slow Over a Circular Cylinder Solution by the Technique Relaxation Part IV*Other Topics 11 Some Advanced Topics in Modern CFD A Discussion 12 The Future of Computational Fluid Dynamics Appendixes A Thomas's Algorithm for the Solution of A Tridiagonal System of Equations References
1,738 citations
01 Aug 1994
TL;DR: In this article, a new k-epsilon eddy viscosity model, which consists of a new model dissipation rate equation and a new realizable eddy viscous formulation, is proposed.
Abstract: A new k-epsilon eddy viscosity model, which consists of a new model dissipation rate equation and a new realizable eddy viscosity formulation, is proposed. The new model dissipation rate equation is based on the dynamic equation of the mean-square vorticity fluctuation at large turbulent Reynolds number. The new eddy viscosity formulation is based on the realizability constraints: the positivity of normal Reynolds stresses and Schwarz' inequality for turbulent shear stresses. We find that the present model with a set of unified model coefficients can perform well for a variety of flows. The flows that are examined include: (1) rotating homogeneous shear flows; (2) boundary-free shear flows including a mixing layer, planar and round jets; (3) a channel flow, and flat plate boundary layers with and without a pressure gradient; and (4) backward facing step separated flows. The model predictions are compared with available experimental data. The results from the standard k-epsilon eddy viscosity model are also included for comparison. It is shown that the present model is a significant improvement over the standard k-epsilon eddy viscosity model.
1,524 citations
TL;DR: In this paper, an existing discrete droplet model of liquid sprays has been extended to include a stochastic representation of turbulent dispersion effects, and applications to simple test cases, including the dispersion of single particles, produce reasonable agreement.
Abstract: An existing ''discrete droplet'' model of liquid sprays has been extended to include a stochastic representation of turbulent dispersion effects. Applications to simple test cases, including the dispersion of single particles, produce reasonable agreement. However, two further applications involving volatile and combusting sprays show that the turbulent dispersion effects are small in comparison to those due to uncertainties about the initial conditions of the spray.
1,152 citations