NUMERICAL SIMULATION OF AN IN-LINE TUBE BUNDLE USING THE URANS APPROACH | ||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||
| Article 125, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Pages 416-430 PDF (882.79 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/amme.2008.39755 | ||
| Authors | ||
| AMMOUR D.1; ADJLOUT L.1; ADDAD Y.2; REVELL A.2 | ||
| 1Faculty of Mechanical Engineering, Department of Marine Engineering University of Science and Technology U.S.T.ORAN-MB, B.P.1505 Oran El Mnaouar 31000, Oran, ALGERIA. | ||
| 2School of MACE, Manchester University, M60 1QD, Manchester, UK. | ||
| Abstract | ||
| ABSTRACT In the present work, a turbulent flow across a square in-line tube bundle is computed using the Unsteady Reynolds Averaged Navier-Stokes (URANS) approach. The pitch ratio used in the tube bundle configuration is P/D=T/D=1.44 and the Reynolds number is 70000 based on tube diameter. Both 2D and 3D computational domains are considered. Turbulence models tested include the standard k–ε model of Jones et al. [12], the k-ω Shear Stress Transport (SST) model of Menter [10] and the Reynolds Stress Model of Speziale et al. [11] (SSG). In addition, the recently developed, SST- as C model by Revell [1] is also tested. The unstructured industrial code Code-Saturne has been used for the present study. In general, the flow predictions using the 2D grid fail to capture correctly the general flow physics; while on the other hand, the 3D calculations give predictions of pressure fields and velocity profiles that are in broad agreement with both LES results [2] and the more recent experimental data [4]. With regards to turbulence models, a comparison of the pressure coefficient and velocity profiles revealed that the SST- as C and RSM models, both seem to give reasonable predictions of the flow, capturing the asymmetric behaviour of the flow as the reference data. As expected, the standard κ – ε model fails to capture this behaviour and predicts a rather symmetric flow field. The pressure spectra from the SST- as C calculation indicates a single clear peak at around the frequency 45Hz (St=0.84), similar to that observed in LES predictions. This suggests that both large and small re-circulations coexist on the wake of centre tubes resulting in the shear stress to be higher in the bottom than on the top of the tubes. | ||
| Keywords | ||
| Tube bundles; RANS; URANS; turbulence modelling; asymmetric flow | ||
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