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Grid type impact on the results of the volume of fluid method in the free surface flow calculations around ship hull

100%

Sugalski K. , Skrúcaný T.

tom Vol. 1, Iss. 1

151--157

This article presents results of the free surface flow around ship hull on two different types of computational grid. Each type of mentioned grid has its own advantages and disadvantages in particular cases, mostly in one phase simulation. Omitting cases with capitation, there is no free surface involved in one phase simulation. Multiphase simulations are crucial in the ship design process and optimization. Recreating free surface on the triangular mesh causes difficulties, in contrast to the hexahedral meshes, where calculated surface is more aligned to the physical border of the fluids. In this paper, results from the triangular mesh were compared to results from hexahedral mesh. Conclusions about triangular meshes in two phase simulation are presented. The computational fluid dynamic toolbox OpenFOAM is used to perform calculations of the total resistance of work boat in calm water.

Efficiency of anti-noise barriers in railway transport

80%

Hranický M. P. , Kendra M. , Skrúcaný T.

2016

tom nr 3

43--52

This paper is focused on the comprehensive analysis of the railway noise issues. It deals with the influence of noise on the environment and presents the options how the noise from the railway transport might be reduced by noise barriers. In conclusion, the theoretical part is complemented by a practical one in the form of measuring and subsequent analysis.

Vehicle coast-down method as a tool for calculating total resistance for the purposes of type-approval fuel consumption

61%

Šarkan B. , Skrúcaný T. , Semanová Š. , Madleňák R. , Kuranc A. , Sejkorová M. , Caban J.

tom z. 98

161--172

A coast-down test is carried out in cases when there is a need for the exact expression of the forces acting on a road vehicle during its coast-down. These forces act mainly against the vehicle’s movement due to air and tyre rolling resistance. Knowledge of the course of these forces throughout the vehicle’s movement range is also a requirement when measuring fuel consumption with a roller performance dynamometer. The reason is that this device has to load the rollers by force or performance corresponding to the given vehicle, while testing it during various driving cycles. For approval purposes, the requirements for this type of test are described in the applicable regulations, i.e., UNECE Regulations No. 83 and No. 101, or the newly developed Worldwide Harmonized Light Vehicles Test Procedure (WLTP). Slovak Technical Standard STN 30 0556 also contains detailed procedures for carrying out the test. The authors of this paper have taken into account both types of technical regulations in order to conduct coast-down tests on chosen vehicles. The results are usable in terms of measuring fuel consumption on a roller dynamometer. Furthermore, the vehicle’s economic performance in normal operation mode can be also assumed with these results.