ANALISIS KARAKTERISTIK ALIRAN MELALUI PENAMPANG PERSEGI PANJANG MENGGUNAKAN MODEL TURBULEN LARGE EDDY SIMULATION (LES)

Authors

  • La Ode Ahmad Barata Universitas Halu Oleo
  • Samhuddin Samhuddin Universitas Halu Oleo

DOI:

https://doi.org/10.21776/jrm.v15i1.1495

Keywords:

Rectangular, Free-end, Numeric, Flow Characteristics, Dynamic Response

Abstract

Dynamic response, fatigue, and stability issues of a structure are closely related to flow behavior past a bluff body structure. Flow past the free-end rectangular prism is investigated numerically using a Large Eddy Simulation (LES) turbulence model at Re = 22000. The prism model has a constant depth (D) to width (H) ratio D/H = 0.5 for span length variation L (= 10; 7,5; 5,0 and 2,5H). Effects of the free end on the flow characteristics showed that the flow pattern, velocity vector, and fluid forces component are changed. The presence of the free end is closed related to the flow characteristics alteration in the wake, which is presented graphically in this paper. This study suggests the critical aspect ratio of the slender rectangular is 2,5<L/H<5,0 The prism with critical aspect L = 2,5H presented an unusual flow behavior among the test models. The dynamic response of the test model affects the flow pattern in the wake, which is indicated by alteration of the region and intensity of vorticity, velocity vector, hydrodynamic force components, and other local components.

References

Nakaguchi, H., Hashimoto, K. and Muto, S., “An Experimental Study on Aerodynamic Drag of Rectangular Cylinders,” J. Japan Soc. Aeronaut. Eng., vol. 16, no. 168, pp. 1–5, 1968.

Nakamura, Y., and Hirata, K., “Critical geometry of oscillating bluff bodies,” J. Fluid Mech., vol. 208, pp. 375–393, 1989, DOI : 10.1017/S0022112089002879.

Mashadi, A., Sohankar, A., and Alam, M., “Flow over rectangular cylinder : Effects of cylinder aspect ratio and Reynolds number,” Int. J. Mech. Sci., vol. 195, no. December 2020, p. 106264, 2021, DOI: 10.1016/j.ijmecsci.2020.106264.

Liu, Y.Z., Ma, C.M., Dai, K.S., El Damtty, A., and Li, Q.S., “Improved understanding of transverse galloping of rectangular cylinders,” J. Wind Eng. Ind. Aerodyn., vol. 221, no. January 2022, p. 104884, Feb. 2022, DOI: 10.1016/j.jweia.2021.104884 .

Sumner, D., Rostamy, N., Bergstrom, D.J., and Bugg, J.D., “Influence of aspect ratio on the mean flow field of a surface-mounted finite-height square prism,” Int. J. Heat Fluid Flow, vol. 65, pp. 1–20, Jun. 2017, DOI: 10.1016/J.IJHEATFLUIDFLOW.2017.02.004.

Bearman, P.W., “Circular cylinder wakes and vortex-induced vibrations,” J. Fluids Struct., vol. 27, no. 5–6, pp. 648–658, 2011, DOI: 10.1016/j.jfluidstructs.2011.03.021.

Okajima, A., Nagahisa, T., and Rokugoh, A., “A Numerical Analysis of Flow around Rectangular Cylinders,” JSME Int. journal. Ser. 2, Fluids Eng. heat Transf. power, Combust. Thermophys. Prop., vol. 33, no. 4, pp. 702–711, 1990, DOI: 10.1299/jsmeb1988.33.4_702.

Parkinson, G., “Phenomena and modelling of flow-induced vibrations of bluff bodies,” Prog. Aerosp. Sci., vol. 26, no. 2, pp. 169–224, 1989.

Budiprasojo, A., and Firmansyah, M.R., “Aerodynamic Analysis in the Design of an Electric Vehicle Model Tobacco Style M-164 With Computational Fluid Dynamic (Cfd) Method,” J. Rekayasa Mesin, vol. 13, no. 2, pp. 435–442, 2022, DOI: 10.21776/jrm.v13i2.1051.

Bearman, P.W., “Vortex Shdding from Oscillating Bluff Bodies,” Annu. Rev. Fluid Mech., vol. 16, pp. 195–222, 1984, .

Barata, L.O.A., Kiwata, T., Ueno, T., Samhuddin, and Hasanudin, L., “Experimental Investigation of Bladeless Power Generator from Wind-induced Vibration,” Int. J. Renew. Energy Dev., vol. 11, no. 3, pp. 661–675, Aug. 2022, DOI: 10.14710/ijred.2022.43888.

Barata, L.O.A., and Samhuddin, “Karakteristik Pemanen Daya Listrik Berbasis Getaran Struktur,” J. Rekayasa Mesin, vol. 13, no. 3, pp. 911–919, Jan. 2023, DOI: 10.21776/jrm.v13i3.1268.

Barata, L.O.A., Ngii, E., Kiwata, T., and Ueno, T., “The Performance of Magnetostrictive Material for Wind-Induced Vibration Power Generator,” Appl. Mech. Mater., vol. 912, pp. 77–83, Feb. 2023, DOI: 10.4028/p-rvm949.

Williamson, C.H.K. and Govardhan, R., “Vortex-Induced Vibrations,” Annu. Rev. Fluid Mech., vol. 36, no. 1, pp. 413–455, 2004, DOI: 10.1146/annurev.fluid.36.050802.122128.

Bruno, L., Fransos, D., Coste, N., and Bosco, A., “3D flow around a rectangular cylinder: A computational study,” J. Wind Eng. Ind. Aerodyn., vol. 98, no. 6–7, pp. 263–276, 2010, DOI: 10.1016/j.jweia.2009.10.005.

Barata, L.O.A., Ngii, E., Kiwata, T., Ueno, T., “Enhancing Dynamic Response of Cantilevered Rectangular Prism Using a Splitter Plate as a Passive Turbulence Control in Water Tunnel,” J. Adv. Res. Fluid Mech. Therm. Sci., vol. 91, no. 2, pp. 1–14, Feb. 2022, DOI: 10.37934/arfmts.91.2.114

Chauhan, M.K., Dutta, S., More, B.S., and Gandhi, B.K., “Experimental investigation of flow over a square cylinder with an attached splitter plate at intermediate reynolds number,” J. Fluids Struct., vol. 76, pp. 319–335, 2018, DOI: 10.1016/j.jfluidstructs.2017.10.012.

Sharma, K.R., and Dutta, S., “Flow control over a square cylinder using attached rigid and flexible splitter plate at intermediate flow regime,” Phys. Fluids, vol. 32, no. 1, p. 014104, Jan. 2020, DOI: 10.1063/1.5127905.

Rastan, M.R., Shahbazi, H., Sohankar, A., Alam, M., and Zhou, Y., “The wake of a wall-mounted rectangular cylinder : Cross-sectional aspect ratio effect,” J. Wind Eng. Ind. Aerodyn., vol. 213, no. April, p. 104615, 2021, DOI: 10.1016/j.jweia.2021.104615

Larsson, J., Kawai, S., Bodart, J. and Bermejo-Moreno, I., “Large eddy simulation with modeled wall-stress: recent progress and future directions,” Mech. Eng. Rev., vol. 3, no. 1, pp. 15-00418-15–00418, 2016, DOI: 10.1299/mer.15-00418.

Tian, X., Ong, M.C., Yang, J. and Myrhaug, D., “Unsteady RANS simulations of flow around rectangular cylinders with different aspect ratios,” Ocean Eng., vol. 58, pp. 208–216, Jan. 2013, DOI: 10.1016/j.oceaneng.2012.10.013.

Nicoud, F., and Ducros, F., “Subgrid-Scale Stress Modelling Based on the Square of the Velocity Gradient Tensor,” Flow, Turbul. Combust., vol. 62, pp. 183–200, Mar. 1999, DOI: https://doi.org/10.1023/A:1009995426001

ANSYS, ANSYS Fluent 18.1. Theory Guide, no. April. ANSYS, Inc, 2017.

Oberkampf, W.L., and Barone, M.F., “Measures of agreement between computation and experiment: Validation metrics,” J. Comput. Phys., vol. 217, no. 1, pp. 5–36, Sep. 2006, DOI: 10.1016/j.jcp.2006.03.037.

Oberkampf, W.L., and Trucano, T.G., “Verification and validation in computational fluid dynamics,” Prog. Aerosp. Sci., vol. 38, no. 3, pp. 209–272, Apr. 2002, DOI: 10.1016/S0376-0421(02)00005-2.

Tamura, T., and Dias, P.P.N., “Unstable aerodynamic phenomena around the resonant velocity of a rectangular cylinder with small side ratio,” J. Wind Eng. Ind. Aerodyn., vol. 91, no. 1–2, pp. 127–138, Jan. 2003, DOI: 10.1016/S0167-6105(02)00340-9.

Haque, N., Katsuchi, H., Yamada, H., and Nishio, M., “Numerical simulation for effects of wind turbulence on flow field around rectangular cylinder,” vol. 59, no. March, 2013.

Knisely, C.W., “Strouhal numbers of rectangular cylinders at incidence: A review and new data,” J. Fluids Struct., vol. 4, no. 4, pp. 371–393, Jul. 1990. DOI: 10.1016/0889-9746(90)90137-T.

Hiroaki, N., “A Study of the Wind Force on Several Rectangular Prisms,” J. Appl. Mech., vol. 5, pp. 689–698, 2002, DOI: 10.1016/j.jcp.2006.03.037.

Mizukami, S., “Study on the flow around the elastic supported prism and the vibration dynamics of the flow (in Japanese),” Kanazawa University, 2017.

Mannini, C., Marra, A.M., and Bartoli, G., “VIV–galloping instability of rectangular cylinders: Review and new experiments,” J. Wind Eng. Ind. Aerodyn., vol. 132, pp. 109–124, Sep. 2014, DOI: 10.1016/j.jweia.2014.06.021.

Daniels, S.J., Castro, I.P., and Xie, Z.T., “Numerical analysis of freestream turbulence effects on the vortex-induced vibrations of a rectangular cylinder,” J. Wind Eng. Ind. Aerodyn., vol. 153, pp. 13–25, 2016, DOI: http://dx.doi.org/10.1016/j.jweia.2016.03.007.

Kawamura, T., Hiwada, M., Hibino, T., Mabuchi, I., and Kumada, M., “Flow around a Finite Circular Cylinder on a Flat Plate : Cylinder height greater than turbulent boundary layer thickness,” Bull. JSME, vol. 27, no. 232, pp. 2142–2151, Nov. 1984, DOI: 10.1299/jsme1958.27.2142.

Palau-Salvador, G., Stoesser, T., Frolich, J., Kappler, M., and Rodi, W., “Large Eddy Simulations and Experiments of Flow Around Finite-Height Cylinders,” Flow, Turbul. Combust., vol. 84, no. 2, pp. 239–275, Mar. 2010, DOI: 10.1007/s10494-009-9232-0.

Pattenden, R.J., Turnock, S.R., and Zhang, X., “Measurements of the flow over a low-aspect-ratio cylinder mounted on a ground plane,” Exp. Fluids, vol. 39, no. 1, pp. 10–21, Jul. 2005, DOI: 10.1007/s00348-005-0949-9.

Barata, L.O.A., Kiwata, T., Rachman, A., Samhuddin, and Endriatno, N., “Numerical Investigation of Flow Around Finite Height Rectangular,” CFD Lett., vol. 15, no. 6, pp. 154–175, Apr. 2023, DOI: 10.37934/cfdl.15.6.154175.

Rostami, A.B., and Armandei, M., “Renewable energy harvesting by vortex-induced motions: Review and benchmarking of technologies,” Renew. Sustain. Energy Rev., vol. 70, pp. 193–214, Apr. 2017, 10.1016/j.rser.2016.11.202.

Wang, C., Weng, Q., Zhou, S., Hua, X. and Huang, Z., “Effects of end condition and aspect ratio on vortex-induced vibration of a 5 : 1 rectangular cylinder,” J. Fluids Struct., vol. 109, no. January, p. 103480, 2022, DOI: 10.1007/s42241-022-0011-x.

Downloads

Published

2024-05-15

Issue

Section

Articles