Assessment of two wind gust injection methods

Boulbrachene, Khaled; De Nayer, Guillaume; Breuer, Michael

doi:10.1016/j.jweia.2021.104790

Assessment of two wind gust injection methods

Field velocity vs. split velocity method

Publication date

2021-10-09

Document type

Research article

Author

Organisational unit

DOI

10.1016/j.jweia.2021.104790

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/13905

Publisher

Elsevier

Series or journal

Journal of Wind Engineering and Industrial Aerodynamics

ISSN

0167-6105

Periodical volume

218

Article ID

104790

Is part of

https://openhsu.ub.hsu-hh.de/handle/10.24405/23780

Peer-reviewed

✅

Part of the university bibliography

✅

Language

English

Keyword

Field velocity method

Split velocity method

Vertical and horizontal wind gust

Feedback effect

ECG

Fluid-structure interaction

Computational fluid dynamics (CFD)

Abstract

The objective of the present paper is to revisit two well-known wind gust injection methods in a consistent manner and to assess their performance based on different application cases. These are the field velocity method (FVM) and the split velocity method (SVM). For this purpose, both methods are consistently derived pointing out the link to the Arbitrary Lagrangian Eulerian formulation and the geometric conservation law. Furthermore, the differences between FVM and SVM are worked out and the advantages and disadvantages are compared. Based on a well-known test case considering a vertical gust hitting a plate and a newly developed case taking additionally a horizontal gust into account, the methods are evaluated and the deviations resulting from the disregard of the feedback effect in FVM are assessed. The results show that the deviations between the predictions by FVM and SVM are more pronounced for the horizontal gust justifying the introduction of this new test case. The main reason is that the additional source term in SVM responsible for the feedback effect of the surrounding flow on the gust itself nearly vanishes for the vertical gust, whereas it has a significant impact on the flow field and the resulting drag and lift coefficients for the horizontal gust. Furthermore, the correct formulation of the viscous stress tensor relying on the total velocity as done in case of SVM plays an important role, but is found to be negligible for the chosen Reynolds number of the present test cases. The study reveals that SVM is capable of delivering physical results in contradiction to FVM. It paves the way for investigating further complex gust configurations (e.g., inclined gusts) and practical applications towards coupled fluid–structure interaction simulations of engineering structures impacted by wind gusts.

Description

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)

Cite as

Journal of Wind Engineering & Industrial Aerodynamics 218 (2021) 104790

Version

Published version

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