paper (6).pdf (2.76 MB)
Flow and surface heat transfer analysis of a square cylinder in turbulent cross-flow
Flow passing a heated square cylinder is investigated using a hybrid LES-RANS approach on unstructured grids at a moderate Reynolds number of 22, 050. The effects of inflow turbulence on the flow field as well as surface convective heat transfer are studied by adopting a grid-based random-number method (GRM). Validation of the GRM method is carried out by generating and simulating a decaying homogeneous isotropic turbulent flow. Analysis of the turbulent quantities and comparisons with the Synthetic Coherent Eddy Method (SCEM) suggest that the cheaper GRM is able to generate good quality inflow turbulence, despite a longer transition region is required. Studies of the heated square cylinder in crossflow show that the inflow turbulence results in an early breakup of the shear layer, which leads to further effects on the vortex shedding and surface heat transfer. The surface convective heat transfer is increased with inflow turbulence, especially on the front, top and bottom surfaces, while limited influence is found on the rear surface. It is shown by the spectra that the effects of the inflow turbulence mainly focus on the turbulent shear layers, as well as heat transfer of the corresponding surfaces.
Funding
Department of Aeronautical and Automotive Engineering
Rolls-Royce UTC at Loughborough University
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
Numerical Heat Transfer, Part A: ApplicationsVolume
75Issue
12Pages
795 - 823Citation
CHEN, X-S. and XIA, H., 2019. Flow and surface heat transfer analysis of a square cylinder in turbulent cross-flow. Numerical Heat Transfer, Part A: Applications, 75 (12), pp.795-823Publisher
Taylor & FrancisVersion
- AM (Accepted Manuscript)
Rights holder
© Taylor & FrancisPublisher statement
This is an Accepted Manuscript of an article published by Taylor & Francis in Numerical Heat Transfer, Part A: Applications on 10 May 2019, available online: http://www.tandfonline.com/10.1080/10407782.2019.1594337.Acceptance date
2018-10-21Publication date
2019-05-10Copyright date
2019ISSN
1040-7782eISSN
1521-0634Publisher version
Language
- en