Modelling high Re flow around a 2D cylindrical bluff body using the k-omega (SST) turbulence model


Pang A. L. J. , Skote M., Lim S. Y.

PROGRESS IN COMPUTATIONAL FLUID DYNAMICS, cilt.16, ss.48-57, 2016 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 16 Konu: 1
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1504/pcfd.2016.074225
  • Dergi Adı: PROGRESS IN COMPUTATIONAL FLUID DYNAMICS
  • Sayfa Sayıları: ss.48-57

Özet

In this work, we analyse the ability for the k-omega (SST) model to accurately predict a high Reynolds number, Re, flow around a cylindrical bluff body, relative to other two-equation RANS models. We investigate the sensitivity of incorporating a curvature correction modification in the k-omega (SST) model to improve the limitation of the eddy-viscosity-based models of capturing system rotation and streamline curvature for a flow around a cylinder. Finally, the ability for this turbulence model to capture the surface roughness of the cylinder is evaluated. Based on this work, we conclude that the k-omega (SST) model is superior to other two-equation RANS models and is able to capture the effects of surface roughness. The curvature correction modification to the k-omega (SST) model further improves this model.

Heat transfer and pressure drop characteristics are investigated numerically on tube bundle support plates for inline and staggered arrangements. 3D numerical analyses are performed and validated by comparisons with experimental results. Four different Unsteady Reynolds Averaged Navier-Stokes based turbulence models, namely the realizable k-ε, standard k-ω, SST k-ω and transition SST models are used and compared with each other within an Unsteady RANS formulation. In order to reduce the computational effort, simplifications with respect to the domain definition are applied, which are validated within the framework of preliminary studies for assuring accuracy. A constant inlet temperature and a uniform heat flux on the support plates are applied as thermal boundary conditions. The Reynolds number is varied from 989 to 5550, while keeping the Prandtl number constant at 0.70. The Nusselt number and the pressure drop are obtained as functions of the Reynolds numbers. The effects of tube bundle arrangements on heat transfer and pressure drop are discussed.