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Very-Large-Eddy Simulation of Nonreactive Turbulent flow for Annular Trapped Vortex Combustor
Author(s): Kai Zhang, Yi Jin, Xingsi Han, Xiaomin He
Keywords: hybrid RANS-LES method, Very Large Eddy Simulation, trapped vortex combustor flow
A new hybrid RANS-LES method is applied in this work. It called the VLES turbulence closure model. This present study aims to validate the accuracy of this method for a specific engineering application (Trapped Vortex Combustor) and secondly to describe its flow characteristics. The Trapped vortex combustor is a new concept utilizing a large recirculation vortex to stabilize the flame. Accurate prediction of the turbulent flow is meaningful for the Trapped Vortex Combustor. The time-averaged velocity, root-mean-square (RMS) velocity, and flow pattern are compared with the experiment data. Furthermore, the LES model, RANS BSL k-ω model, RANS k-ɛ model are also applied for the simulation with different mesh resolutions. The results show that the new VLES BSL k-ω model gives good accuracy for the velocity prediction over the RANS model. The classical large vortex structure for the Trapped vortex combustor is captured qualitatively by the VLES BSL k-ω model also. Besides, vortex breakdown and processing vortex cone are visualized by Q-criterion. Furthermore, the new VLES BSL k-ω model is not sensitive to the gird resolution. The new VLES method is able to predict the Trapped vortex combustor turbulent flow quite well.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.