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001-es BibID:	BIBFORM102336
035-os BibID:	(Scopus)85131873193 (cikkazonosító)5688 (WOS)000809964500001
Első szerző:	Szodrai Ferenc (létesítménymérnök)
Cím:	Numerical Assessment of Side-Wind Effects on a Bus in Urban Conditions / Ferenc Szodrai
Dátum:	2022
ISSN:	2076-3417
Megjegyzések:	The drag coefficient is usually considered to be a constant value, which allows us to calculate the aerodynamic losses. However, at lower speeds and wind, this value could be distorted. This also applies to buses in urban environments where due to traffic, the speed is relatively low. Since the schedule of the buses is fixed, based on the driving cycle, they travel at a nominal cruising speed. This makes it possible to examine the drag losses in a quasi-steady condition. To find the magnitude of this distortion in losses, a large-eddy simulation method was used with the help of commercially available software. Symmetrical and asymmetrical flows were induced into the digital wind tunnel to assess the distribution of the forces in the cruising direction and examine the flow patterns. It was discovered that the drag forces behave differently due to the low speeds, and calculations should be performed differently compared to high-speed drag evaluations.
Tárgyszavak:	Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk drag loss side wind large-eddy simulation bus
Megjelenés:	Applied Sciences-Basel. - 12 : 11 (2022), p. 1-14. -
Pályázati támogatás:	ED_18-1-2019-0028 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM086656
035-os BibID:	(Scopus)85087316135 (WOS)000554727500001 (cikkazonosító)4313
Első szerző:	Szodrai Ferenc (létesítménymérnök)
Cím:	Quantitative Analysis of Drag Reduction Methods for Blunt Shaped Automobiles / Ferenc Szodrai
Dátum:	2020
ISSN:	2076-3417
Megjegyzések:	In fluid mechanics, drag related problems aim to reduce fuel consumption. This paper is intended to provide guidance for drag reduction applications on cars. The review covers papers from the beginning of 2000 to April 2020 related to drag reduction research for ground vehicles. Research papers were collected from the library of Science Direct, Web of Science, and Multidisciplinary Digital Publishing Institute (MDPI). Achieved drag reductions of each research paper was collected and evaluated. The assessed research papers attained their results by wind tunnel measurements or calculating validated numerical models. The study mainly focuses on hatchback and notchback shaped ground vehicle drag reduction methods, such as active and passive systems. Quantitative analysis was made for the drag reduction methods where relative and absolute drag changes were used for evaluations.
Tárgyszavak:	Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk active flow control passive flow control coefficient of drag ground vehicle car
Megjelenés:	Applied Sciences-Basel. - 10 : 12 (2020), p. 1-19. -
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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