Türbülans Modeli Seçiminin Zemin Etkisindeki 3B Bir Kanatın Sayısal Modellemesine Olan Etkisi

Yıl 2022, Sayı: 43, 86 - 90, 30.11.2022

Yavuz Hakan Ozdemir , Taner Çoşgun

https://doi.org/10.31590/ejosat.1200056

Öz

Bu çalışma, farklı RANS türbülans modellerinin Zemin etkisinde çalışan 3B simetrik bir kare kanatın sayısal modellemesindeki etkisini incelemektedir. Katı bir Zemin yakınında hareket etme, ya da bilinen ismiyle yer etkisi, bir kanatın aerodinamik karakteristiğini öenmli oranda etkiler. Bu makalede amaç, farklı eddy viskozitesi türbülans modellerinin yer etkisi esnasındaki aerodinamik davranışı modelleme yönünden performansının araştırılmasıdır. Üç farklı türbülans modeli, realizable , SST and Spalart-Allmaras modelleri incelemeye dahil edilmiştir. Türbülans modellerinin etkinlikleri farklı hücum açıları ve kanat yükseklikleri için deneysel verilerle karşılaştırmalı olarak test edilmiştir. Sonuçlar göstermektedir ki, türbülans modellerinin yer etkisi aerodinamiği hesaplamaları konusundaki başarısı irtifa ve hücum açısı ile doğrudan ilişkilidir. Türbülans modeli seçimi kanat yere çok yakın hareket edşyorken ve hücum açısı düşük ya da negatifken önemli hale gelmektedir. Elde edilen sonuçların birbirlerinden farklılığı temel olarak kanat alt yüzeyindeki basınç dağılımından kaynaklanmaktadır. Yüksek hücum açıları ve irtifalarda farklı türbülans modelleri ile elde edilen tahminler arası fark ihmal edilebilir düzeyde kalmaktadır.

Anahtar Kelimeler

Zemin Etkisi, Kare Kanat, Aerodinamik, HAD, Türbülans modelleri, RANS

The Influence of Turbulence Models on the Numerical Modelling of a 3D Wing in Ground Effect

Öz

This paper deals with the influence of different RANS turbulence models on the numerical modelling of a 3D rectangular symmetrical wing in ground effect. Travelling near a solid surface, so-called ground effect, considerably alters the aerodynamic characteristics of a wing. This paper aims to investigate the performance of the widely used eddy viscosity turbulence models while predicting the changing aerodynamic behavior due to the ground effect. Three different RANS turbulence models, realizable , SST and Spalart-Allmaras models are taken into consideration. The effectiveness of the turbulence models were tasted in comparison with the experimental data in different angles of attack and ground heights. Results reveals that, the effect of the turbulence models on the numerical accuracy of the ground effect aerodynamics calculations are related to the altitude and the angle of attack. The choice of the turbulence model becomes important when the wing travels in very close proximity to the ground and the angle of attack is low or negative. The discrepancy of the calculated results mainly comes from the pressure distribution variations on the lower side of the wing. For high angles of attack, or relatively larger ground heights, the difference between the predictions of the turbulence models become negligible.

Anahtar Kelimeler

Ground effect, Rectengular wing, Aerodynamics, CFD, Turbulence models, RANS

Kaynakça

• Doig, G., & Barber, T. J. (2012). Considerations for Numerical Modeling of Inverted Wings in Ground Effect. AIAA Journal, 49(10), 2330–2333. https://doi.org/https://doi.org/10.2514/1.J051273
• Firooz, A., & Gadami, M. (2006). Turbulence Flow for NACA 4412 in Unbounded Flow and Ground Effect with Different Turbulence Models and Two Ground Conditions : Fixed and Moving Ground Conditions. Int. Conference on Boundary and Interior Layers.
• He, Y., Qu, Q., & Agarwal, R. K. (2014). Shape optimization of an airfoil in ground effect for application to WIG craft. Journal of Aerodynamics, 2014. https://doi.org/https://doi.org/10.1155/2014/931232
• Jia, Q., Yang, W., & Yang, Z. (2016). Numerical study on aerodynamics of banked wing in ground effect. International Journal of Naval Architecture and Ocean Engineering, 8(2), 209–217. https://doi.org/10.1016/j.ijnaoe.2016.03.001
• Jithin, P. N., & Arumugham-Achari, A. K. (2021). Shape Optimisation of NACA4412 In-Ground Effect- Selection of a Turbulence Model. ASME 2021 Fluids Engineering Division Summer Meeting, 1. https://doi.org/https://doi.org/10.1115/FEDSM2021-65600
• Lee, S. H., & Han, Y. O. (2020). Experimental Investigation of High-Angle-of-Attack Aerodynamics of Low-Aspect-Ratio Rectangular Wings Configured with NACA0012 Airfoil Section. International Journal of Aeronautical and Space Sciences, 21(2), 303–314. https://doi.org/10.1007/S42405-019-00215-Z/FIGURES/15
• Moore, N., Wilson, P. A., & Peters, A. J. (2002). An investigation into wing in ground effect aerofoil geometry. In RTO-MP-095; NATO RTO.11; NATO RTO (p. 20). Washington DC, USA.
• Nirooei, M. (2018). Aerodynamic and static stability characteristics of airfoils in extreme ground effect. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 232(6), 1134–1148. https://doi.org/10.1177/0954410017708212
• Ozden, K. S., Karasu, I., & Genc, M. S. (2020). Experimental investigation of the ground effect on a wing without/with trailing edge flap. Fluid Dynamics Research, 52(4), 045504. https://doi.org/10.1088/1873-7005/ABA1D8
• Qu, Q., Ju, B., Huang, L., Liu, P., & Agarwal, R. K. (2016). Flow physics of a multi-element airfoil in ground effect. 54th AIAA Aerospace Sciences Meeting, 0(January), 1–16. https://doi.org/10.2514/6.2016-0856
• Qu, Q., Wang, W., Liu, P., & Agarwal, R. K. (2015). Airfoil Aerodynamics in Ground Effect for Wide Range of Angles of Attack. AIAA Journal, 53(4), 1048–1061. https://doi.org/10.2514/1.J053366
• Schmid, S., Lutz, T., & Krämer, E. (2009). Impact of Modelling Approaches on the Prediction of Ground Effect Aerodynamics. Engineering Applications of Computational Fluid Mechanics, 3(3), 419–429. https://doi.org/10.1080/19942060.2009.11015280
• Siemens. (2019). Star-CCM+ User Guide version 14.02.
• Zaheer, Z., Reby Roy, K. E., Nair, G. S., Ragipathi, V., & Niranjan, U. V. (2019). CFD analysis of the performance of different airfoils in ground effect. Journal of Physics: Conference Series, 1355(1). https://doi.org/10.1088/1742-6596/1355/1/012006
• Zerihan, J., & Zhang, X. (2012). Aerodynamics of a Single Element Wing in Ground Effect. Journal of Aircraft, 37(6), 1058–1064. https://doi.org/https://doi.org/10.2514/2.2711