COMPUTATIONAL PREDICTION OFWIND INDUCED VIRATIONS IN SILO GROUPS USING 2D AND 3D CFD SIMULATIONS

COMPUTATIONAL PREDICTION OFWIND INDUCED VIRATIONS IN SILO GROUPS USING 2D AND 3D CFD SIMULATIONS

Hillewaere, J.; Degroote, J.; Lombaert, G.; Vierendeels, J.; Degrande, G.

Full Article:

Wind induced ovalling vibrations were observed during a storm in October 2002 on several empty silos of a closely spaced group consisting of 8 by 5 thin-walled silos in the port of Antwerp (Belgium). To clarify the cause and location of the observed silo vibrations, a thorough analysis of the aerodynamic pressures on the silo surfaces is required. Therefore, both 2D and 3D computational fluid dynamics (CFD) simulations have been performed. While the 2D simulations mainly aim at studying the influence of the angle of incidence of the wind flow on the location where ovalling vibrations can be observed, the 3D simulations are performed to incorporate 3D flow effects into the analysis and to assess the validity of the conclusions of the 2D simulations. The 3D pressure distribution on the silo walls is applied as an external time dependent load on a 3D finite element model of a silo to determine the structural response. Afterwards, modal projection of the load is performed to determine the contribution of each ovalling mode shape to the dynamic structural response. For the 2D simulations, a similar technique of harmonic decomposition is derived and validated with the 3D one-way coupling approach. The results of both approaches yield evidence of the onset of ovalling vibrations, corresponding to the observed pattern of oscillations in the Antwerp silo group.

Wind induced ovalling vibrations were observed during a storm in October 2002 on several empty silos of a closely spaced group consisting of 8 by 5 thin-walled silos in the port of Antwerp (Belgium). To clarify the cause and location of the observed silo vibrations, a thorough analysis of the aerodynamic pressures on the silo surfaces is required. Therefore, both 2D and 3D computational fluid dynamics (CFD) simulations have been performed. While the 2D simulations mainly aim at studying the influence of the angle of incidence of the wind flow on the location where ovalling vibrations can be observed, the 3D simulations are performed to incorporate 3D flow effects into the analysis and to assess the validity of the conclusions of the 2D simulations. The 3D pressure distribution on the silo walls is applied as an external time dependent load on a 3D finite element model of a silo to determine the structural response. Afterwards, modal projection of the load is performed to determine the contribution of each ovalling mode shape to the dynamic structural response. For the 2D simulations, a similar technique of harmonic decomposition is derived and validated with the 3D one-way coupling approach. The results of both approaches yield evidence of the onset of ovalling vibrations, corresponding to the observed pattern of oscillations in the Antwerp silo group.

Palavras-chave:

DOI: 10.5151/meceng-wccm2012-18473

Referências bibliográficas

• [1] M.P. Pa¨idoussis, S.J. Price, and H.C. Suen. Ovalling oscillations of cantilevered and clamped-clamped cylindrical-shells in cross flow: An experimental-study. Journal of Sound and Vibration, 83(4):533–553, 1982.
• [2] Abaqus 6.10. User’s Manual. Dassault Systèmes Simulia Corp., 2010.
• [3] D. Dooms, G. Degrande, G. De Roeck, and E. Reynders. Finite element modelling of a silo based on experimental modal analysis. Engineering Structures, 28(4):532–542, 2006
• [4] Ansys 8.1. User’s Manual. Ansys Inc., March 2004.
• [5] FLUENT 12.0. User’s Guide. Ansys Inc., April 2009.
• [6] FLUENT 13.0. User’s Guide. Ansys Inc., 2010.
• [7] M. Behr, D. Hastreiter, S. Mittal, and T.E. Tezduyar. Incompressible flow past a circular cylinder: dependence of the computed flow field on the location of the lateral boundaries. Computer Methods in Applied Mechanics and Engineering, 123(1–4):309–316, 1995.
• [8] Y. Tominaga, A. Mochida, R. Yoshie, H. Kataoka, T. Nozu, M Yoshikawa, and T. Shirisawa. AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings. Journal of Wind Engineering and Industrial Aerodynamics, 96:1749– 1761, 2008.
• [9] BIN. NBN EN 1991-1-4:2005 Eurocode 1: Actions on structures - Part 1-4: General actions - Wind actions. Belgisch Instituut voor Normalisatie, April 2005.
• [10] C. Sak, R. Liu, D.S.-K. Ting, and R.W. Rankin. The role of turbulence length scale and turbulence intensity on forced convection from a heated horizontal circular cylinder. Experimental Thermal and Fluid Science, 31(4):279–289, 2007.
• [11] ESDU. Data Item No. 85020: Characteristics of atmospheric turbulence near the ground. Part II: single point data for strong winds (neutral atmosphere). Engineering Science Data Unit, London, UK, 1985.
• [12] J. Hillewaere, D. Dooms, B. Van Quekelberghe, J. Degroote, J. Vierendeels, G. De Roeck, G. Lombaert, and G. Degrande. Unsteady Reynolds averaged Navier- Stokes simulation of the post-critical flow around a closely spaced group of silos. Journal of Fluids and Structures, 30:51–72, 2012.
• [13] D. Köse, D. Fauconnier, and E. Dick. ILES of flow over low-rise buildings: Influence of inflow conditions on the quality of the mean pressure distribution prediction. Journal of Wind Engineering and Industrial Aerodynamics, 99:1056–1068, 2011.
• [14] M.M. Zdravkovich. Flow Around Circular Cylinders, Volume 1: Fundamentals. Oxford University Press, Oxford, England, 1997.
• [15] W.C.L. Shih, C. Wang, D. Coles, and A. Roshko. Experiments on flow past rough circular cylinders at large Reynolds numbers. Journal of Wind Engineering and Industrial Aerodynamics, 49(1–3):351–368, 1993.

Como citar:

Hillewaere, J.; Degroote, J.; Lombaert, G.; Vierendeels, J.; Degrande, G.; "COMPUTATIONAL PREDICTION OFWIND INDUCED VIRATIONS IN SILO GROUPS USING 2D AND 3D CFD SIMULATIONS", p-1560-1575. In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 23580828, DOI 10.5151/meceng-wccm2012-18473