Title: | Assessment of two wind gust injection methods: Field velocity vs. split velocity method | Authors: | Boulbrachene, Khaled De Nayer, Guillaume Breuer, Michael |
Language: | eng | Keywords: | Field velocity method;Split velocity method;Vertical and horizontal wind gust;Feedback effect;ECG;Fluid-Structure Interaction;Computational Fluid Dynamics | Issue Date: | 9-Oct-2021 | Publisher: | Elsevier | Document Type: | Article | Source: | Journal of Wind Engineering & Industrial Aerodynamics 218 (2021) 104790 | Journal / Series / Working Paper (HSU): | Journal of Wind Engineering and Industrial Aerodynamics | Volume: | 218 | Issue: | 104790 | Page Start: | 1 | Page End: | 22 | Publisher Place: | Amsterdam | 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. |
Organization Units (connected with the publication): | Strömungsmechanik | Publisher DOI: | 10.1016/j.jweia.2021.104790 |
Appears in Collections: | 3 - Publication references (without fulltext) |
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