Large Eddy Simulation of Mixing in the Outlet Plenum of a High Temperature Reactor: A Benchmark Exercise

2004 ◽  
Author(s):  
Jan-Patrice Simoneau ◽  
Julien Champigny
Keyword(s):  
High Temperature ◽  
Large Eddy Simulation ◽  
Unsteady Flows ◽  
Simulation Technique ◽  
Eddy Simulation ◽  
Large Eddy ◽  
High Temperature Reactor

This paper is related to the validation of the CFD codes in the frame of High Temperature Reactor studies. A code to code benchmark involving complex unsteady flows in the outlet plenum is proposed and the Large Eddy Simulation technique is retained. The paper presents the benchmark conditions, the results obtained by the Star-cd software used in Framatome-ANP and the comparison with the Trio-U code (from CEA) and the literature. It presents the advantages of such fine unsteady calculations and mainly highlights the coherence between both analyses.

Review of Some Recent Patents on the Large-Eddy Simulation Technique in Turbulence

2012 ◽  
Vol 5 (2) ◽  
pp. 89-95
Author(s):  
Le Fang ◽  
Yang-Wei Liu ◽  
Guo-Qing Jing ◽  
Shu-Jun Huang
Keyword(s):  
Large Eddy Simulation ◽  
Simulation Technique ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation Study of Flow Dynamics in a Multiswirler Model Combustor at Elevated Pressure and High Temperature

2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Weijie Liu ◽  
Qian Yang ◽  
Ranran Xue ◽  
Huiru Wang
Keyword(s):  
High Temperature ◽  
Large Eddy Simulation ◽  
Elevated Pressure ◽  
Dominant Frequency ◽  
Flow Dynamics ◽  
Main Stage ◽  
Eddy Simulation ◽  
Precessing Vortex Core ◽  
Flow Interaction ◽  
Large Eddy

Large eddy simulation (LES) of nonreacting turbulent flow in a multiswirler model combustor is carried out at elevated pressure and high temperature. Flow interaction between the main stage and the pilot stage is discussed based on the time-averaged and instantaneous flowfield. Flow dynamics in the multiswirling flow are analyzed using a phase-averaged method. Proper orthogonal decomposition (POD) is used to extract dominant flow features in the multiswirling flow. Numerical results show that the main stage and the pilot stage flows interact with each other generating a complex flowfield. Flow interaction can be divided into three regions: converging region, merging region, and combined region. A precessing vortex core (PVC) is successfully captured in the pilot stage. PVC rotates with a first dominant frequency of 2756 Hz inducing asymmetric azimuthal flow instabilities in the pilot stage. POD analyses for the velocity fields also show dominant high-frequency modes (mode 1 and mode 2) in the pilot stage. However, the dominant energetic flow is damped rapidly downstream of the pilot stage such that it has a little effect on the main stage flow.

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