Anisotropy Feature Analysis of the Flow Field Around Straight and T Shaped Spur Dike

Document Type : Research Article

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Abstract

In thispaper the anisotropy features of the flow field around straight and T shaped spur dike were analyzed experimentally. Two different experiments were conducted for flow field around T shaped and straight spur dike at Tarbiat Modares University. Results show that the anisotropy features of the straight and T shaped spur dikes are almost the same. In the upstream section of the flow the turbulence almost has 2-components and in the mean flow levels the flow turbulence is more 3-component form as compared to the near bed levels. Near the outer bank the most 3- component turbulence were observed. This may be due to the small secondary flow formation in this region. In the web section and near the spur dike nose the turbulence is near to 3-component feature as compared to the middle of flow depth. This is because of the horse shoe vortex formation that was formed due to the interaction of the approaching flow and the down flow in the upstream face of the spur dike web. In the downstream section and in the shear layer region the anisotropy feature predominate (1-component turbulence). In the recirculation zone the turbulence is closer to the 3-component features and this is more pronounced in the middle levels. Far away from the shear layer the turbulence of the flow is close to the 2-component turbulent features as compared to the recirculation region. For anisotropy analysis, AIM and BM approaches are almost the same but the anisotropy element shape more coincides with BM approach. However, more experiments are needed to confirm this argument.

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References

خسروی مشیزی، م. (1390). "بررسی آزمایشگاهی الگوی جریان و آبشستگی پیرامون آبشکن T شکل مستغرق در قوس90درجه"، پایان‌نامه کارشناسی ارشد، دانشگاه تربیت مدرس.
شریعت‌زاده، ی. (1390). "بررسی آزمایشگاهی الگوی جریان و آبشستگی پیرامون آبشکن Tشکل جاذب و دافع، مستقر در قوس ‎90 درجه در حالت استغراق"، پایان‌نامۀ کارشناسی ارشد، دانشگاه تربیت مدرس.
فضلی، م. (1387). "مطالعه­ی آزمایشگاهی الگوی آبشستگی پیرامون آبشکن مستقر در قوس 90 درجه"، رساله دکتری، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس.
مهرآیین، م.، نوربخش، س، م. و قدسیان، م. (1394). "بررسی میدان جریان اطراف آبشکن T شکل مستغرق"، مجلۀ عمران مدرس، 15(3)، ص.ص. 185-194.
واقفی، م. (1388). "مطالعه آزمایشگاهی الگوی جریان و آبشستگی پیرامون آبشکن‌های T شکل مستقر در قوس 90 درجه"، رسالۀ دکتری، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس.
Banerjee, S., Krahl, A. R., Durst, B, F. and Zenger, A (2007). "Presentation of anisotropy properties of turbulence, invariants versus eigenvalue approaches", J. Turbul, 8(32), pp. 1-27.
Dey, S. and Barbhuiya, A. K. (2006). "3D flow field in a scour hole at a wing-wall abutment", J. Hydraul. Res, 44(1), pp. 33-50.
Darko R. Radenković ., Jela M. Burazer and Đorđe M. Novković (2014). "Anisotropy analysis of turbulent swirl flow", FME Transactions, 42, pp. 19-25.
Duan, J.G., He, L., Wang, G.Q. and Fu, X. D., (2009). "Mean flow and turbulence around experimental spur dike", Adv. Water. Resour. 32(12), pp. 1717–1725.
Duan, J.G., He, L., Wang, G.Q. and Fu, X.D. (2011). "Turbulent burst around experimental spur dike", Int. J. Sediment. Res. 26(4), pp. 471-486.
Dey S. and Barbhuiya A. K. (2006). "Velocity and turbulence in a scour hole at a vertical-wall abutment", Flow Meass Inst, 17(1), pp. 13-21.
Goring, D. and Nikora, V. (2002). "Despiking acoustic doppler velocimeter data", J. Hydraul. Eng, 128(1), pp. 117–126.
Krogstad, P. and Torbergsen, L. (2000). "Invariant analysis of turbulent pipe flow", Flow. Turbul. Combust., 64, pp. 161–181.
Lumley, J.L. 1978, "Computational modeling of turbulent flows". Adv. Appl. Mech., 18, pp. 123-176.
Lumley, J. L. and Newman, G. (1977). "The return to isotropy of homogeneous turbulence", J. Fluid Mech., 82, pp. 161–178.
Mansoori, A.R. Nakagawa, H., Kawaike, K., Zhang, H., and Safarzadeh, A. (2012 a). "Study of the characteristics of the flow around a sequence of non-typically shaped spur dikes installed in a fluvial channel", Annu. Disas., Prev. Res. Inst. Kyoto. Univ, 55 (B), pp. 453–458
Mansoori, A.R., Nakagawa, H., Kawaike, K., Zhang, H. and Safarzadeh, A. (2012 b). "Three-dimensional features of the turbulent flow around series of groynes with different shapes of head", J. of JSCE, Ser.B1 (Hydraulic Engineering), 68(4), pp. 61-66.
Niell, C. R. (1973). Guide to Bridge Hydraulics, University of Toronto Press, Toronto, Canada.
Pagliara, S, Hassanabadi, L. and Mahmoudi Kurdistani, S. (2015). "Clear water scour downstream of log deflectors in horizontal channels", J. Irrig. Drain. Eng. 10.1061/(ASCE)IR.1943-4774.0000869.
Safarzadeh, A., Salehi Neyshabouri, S., and Zarrati, A. (2016). "Experimental investigation on 3D turbulent flow around straight and T-shaped groynes in a flat bed channel", J. Hydraul. Eng., 10.1061/(ASCE)HY.1943-7900.0001144, 04016021.
Safarzadeh, A. Salehi, S.A.A. Ghodsian, M., and Zarrati, A.R. (2010). "Experimental study of head shape effects on shear stress distribution around a single groyne", The Proceeding of River Flow, 1, pp. 651-658.
Yaeger, M. A. (2009). "Mean flow and turbulence around two series of experimental dikes", MSc Thesis, University of Arizona.
 

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History

  • Receive Date: 09 August 2015
  • Revise Date: 02 July 2016
  • Accept Date: 17 September 2016

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