TY - JOUR
T1 - Large-eddy simulations of the non-reactive flow in the Sydney swirl burner
AU - Yang, Yang
AU - Kær, Søren Knudsen
PY - 2012
Y1 - 2012
N2 - This paper presents a numerical investigation using large-eddy simulation. Two isothermal cases from the Sydney swirling flame database with different swirl numbers were tested. Rational grid system and mesh details were presented firstly. Validations showed overall good agreement in time averaged results. In medium swirling case, there are two reverse-flow regions with a collar-like structure between them. The existence of strong unsteady structure, precessing vortex core, was proven. Coherent structures are detached from the instantaneous field. Q-criterion was used to visualize vorticity field with distinct clear structure of vortice tubes. Dominating spatial–temporal structures contained in different cross sections were extracted using proper orthogonal decomposition. In high swirling case, there is only one long reverse-flow region. In this paper, we proved the capability of a commercial CFD package in predicting complex flow field and presented the potential of large eddy simulation in understanding dynamics.
AB - This paper presents a numerical investigation using large-eddy simulation. Two isothermal cases from the Sydney swirling flame database with different swirl numbers were tested. Rational grid system and mesh details were presented firstly. Validations showed overall good agreement in time averaged results. In medium swirling case, there are two reverse-flow regions with a collar-like structure between them. The existence of strong unsteady structure, precessing vortex core, was proven. Coherent structures are detached from the instantaneous field. Q-criterion was used to visualize vorticity field with distinct clear structure of vortice tubes. Dominating spatial–temporal structures contained in different cross sections were extracted using proper orthogonal decomposition. In high swirling case, there is only one long reverse-flow region. In this paper, we proved the capability of a commercial CFD package in predicting complex flow field and presented the potential of large eddy simulation in understanding dynamics.
KW - Large Eddy Simulation
KW - Vortex breakdown
KW - Vorticity field
KW - Coherent structure
KW - proper orthogonal decomposition
UR - http://www.scopus.com/inward/record.url?scp=84863865247&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatfluidflow.2012.02.008
DO - 10.1016/j.ijheatfluidflow.2012.02.008
M3 - Journal article
SN - 0142-727X
VL - 36
SP - 47
EP - 57
JO - International Journal of Heat and Fluid Flow
JF - International Journal of Heat and Fluid Flow
ER -