TY - GEN
T1 - Proper Orthogonal Decomposition of the flow in a T-junction
AU - Merzari, E.
AU - Pointer, W. D.
AU - Fischer, P.
PY - 2010
Y1 - 2010
N2 - An LES simulation of the turbulent mixing in a T-junction has been carried out with the spectral element code NEK5000. Numerical results have been compared with an available experiment. A large database of snapshots has then been collected and Proper Orthogonal Decomposition (POD), a powerful statistical tool, has been used to identify the most energetic modes of turbulence. Since POD was also performed on the experiment PIV data, a further means of verification and validation was available for the present case. The structure of the numerical POD modes offers additional insight into the physics of turbulence in T-junctions. The present work also presents a more general opportunity to make advection-diffusion computations with CFD codes less expensive when buoyancy effects are not present. One could in fact solve the Navier-Stokes equations to obtain the principal modes of turbulence and then use those modes to solve the advection-diffusion equation for the temperature or a general passive scalar on considerably longer time frames.
AB - An LES simulation of the turbulent mixing in a T-junction has been carried out with the spectral element code NEK5000. Numerical results have been compared with an available experiment. A large database of snapshots has then been collected and Proper Orthogonal Decomposition (POD), a powerful statistical tool, has been used to identify the most energetic modes of turbulence. Since POD was also performed on the experiment PIV data, a further means of verification and validation was available for the present case. The structure of the numerical POD modes offers additional insight into the physics of turbulence in T-junctions. The present work also presents a more general opportunity to make advection-diffusion computations with CFD codes less expensive when buoyancy effects are not present. One could in fact solve the Navier-Stokes equations to obtain the principal modes of turbulence and then use those modes to solve the advection-diffusion equation for the temperature or a general passive scalar on considerably longer time frames.
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M3 - Conference contribution
AN - SCOPUS:77956219442
SN - 9781617386435
T3 - International Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010
SP - 1714
EP - 1721
BT - International Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010
T2 - International Congress on Advances in Nuclear Power Plants 2010, ICAPP 2010
Y2 - 13 June 2010 through 17 June 2010
ER -