TY - GEN
T1 - Extraction of multi-scale vortical structures from a homogeneous isotropic turbulence
AU - Kareem, Waleed Abdel
AU - Izawa, Seiichiro
AU - Xiong, Ao Kui
AU - Fukunishi, Yu
PY - 2008
Y1 - 2008
N2 - An attempt to extract multi-scaled vortical structures from a turbulent field is carried out. The Lattice Boltzmann method with forcing is used to generate a statistically stationary velocity field in a resolution of 256 3. Two methods for filtering, namely the Fourier and wavelet decompositions, are used in the investigation and the results are compared. Three fields that contain vortical structures of different-scales area extracted from the original turbulent field. It is found that the results obtained by the two methods overlap at a high rate. Several universal characteristics among the filtered flow fields are found in the comparisons using the invariants of the velocity gradient, rotation and deformation tensors.
AB - An attempt to extract multi-scaled vortical structures from a turbulent field is carried out. The Lattice Boltzmann method with forcing is used to generate a statistically stationary velocity field in a resolution of 256 3. Two methods for filtering, namely the Fourier and wavelet decompositions, are used in the investigation and the results are compared. Three fields that contain vortical structures of different-scales area extracted from the original turbulent field. It is found that the results obtained by the two methods overlap at a high rate. Several universal characteristics among the filtered flow fields are found in the comparisons using the invariants of the velocity gradient, rotation and deformation tensors.
KW - Fourier filter
KW - Lattice Boltzmann method
KW - Multi-scaled vortices
KW - Velocity gradient analysis
KW - Wavelet filter
UR - http://www.scopus.com/inward/record.url?scp=84861114651&partnerID=8YFLogxK
U2 - 10.1007/978-1-4020-6472-2_22
DO - 10.1007/978-1-4020-6472-2_22
M3 - 会議への寄与
AN - SCOPUS:84861114651
SN - 9781402064715
T3 - Solid Mechanics and its Applications
SP - 143
EP - 148
BT - IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence
T2 - IUTAM Symposium on Computational Physics and New Perspectives in Turbulence
Y2 - 11 September 2006 through 14 September 2006
ER -