The predictive capability of Detached Eddy Simulations (DES) is investigated in stationary as well as rotating ribbed ducts with relevance to the internal cooling of turbine blades. A number of calculations are presented at $Re=20,000$ and rotation numbers ranging from *0.18* to *0.67* with buoyancy parameters up to *0.29* in a ribbed duct with ribs normal to the main flow direction. The results show that DES by admitting a LES solution in critical regions transcends some of the limitations of the base RANS model on which it is based. This feature of DES is exemplified by its sensitivity to turbulence driven secondary flows at the rib side-wall junction, to the effect of Coriolis forces, and centrifugal buoyancy effects. It is shown that DES responds consistently to these non-canonical effects when RANS and URANS with the same model cannot, at a cost which is about a tenth of that of LES for the geometry and Reynolds number considered in this study.

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High Performance Computational Fluids-Thermal Sciences and Engineering Group, Mechanical Engineering Department,
High Performance Computational Fluids-Thermal Sciences and Engineering Group, Mechanical Engineering Department,

e-mail: dtafti@vt.edu

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# Investigation of Detached Eddy Simulations in Capturing the Effects of Coriolis Forces and Centrifugal Buoyancy in Ribbed Ducts

Aroon K. Viswanathan,

Aroon K. Viswanathan

High Performance Computational Fluids-Thermal Sciences and Engineering Group, Mechanical Engineering Department,

Virginia Polytechnic Institute and State University

, Blacksburg, VA 24061
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Danesh K. Tafti

Danesh K. Tafti

High Performance Computational Fluids-Thermal Sciences and Engineering Group, Mechanical Engineering Department,

e-mail: dtafti@vt.edu
Virginia Polytechnic Institute and State University

, Blacksburg, VA 24061
Search for other works by this author on:

Aroon K. Viswanathan

Virginia Polytechnic Institute and State University

, Blacksburg, VA 24061
Danesh K. Tafti

Virginia Polytechnic Institute and State University

, Blacksburg, VA 24061e-mail: dtafti@vt.edu

*J. Heat Transfer*. Jul 2007, 129(7): 778-789 (12 pages)

**Published Online:**January 5, 2007

Article history

Received:

September 4, 2006

Revised:

January 5, 2007

Citation

Viswanathan, A. K., and Tafti, D. K. (January 5, 2007). "Investigation of Detached Eddy Simulations in Capturing the Effects of Coriolis Forces and Centrifugal Buoyancy in Ribbed Ducts." ASME. *J. Heat Transfer*. July 2007; 129(7): 778–789. https://doi.org/10.1115/1.2717944

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