TY - JOUR
T1 - Using projection pursuit and proper orthogonal decomposition to identify independent flow mechanisms
AU - Gilliam, Xiaoning
AU - Dunyak, James P.
AU - Smith, Douglas A.
AU - Wu, Fuqiang
N1 - Funding Information:
This work was performed under the Department of Commerce National Institute of Standards and Technology/Texas Tech University Cooperative Agreement Award 70NAB8H0059 and the National Science Foundation Grant #9980297.
PY - 2004/1
Y1 - 2004/1
N2 - In this paper, we develop a new dimension reduction technique, using the projection pursuit approach, to identify underlying physical mechanisms of the flow. By first applying the standard dimension reduction technique-proper orthogonal decomposition (POD), a low-dimensional subspace is defined. POD models of pressure fields have, in the past, been challenged with questions of interpretation in terms of flow mechanisms. To address this issue, the projection criterion is applied to decompose independent physical mechanisms in the non-Gaussian pressure field. This procedure leads to a non-orthogonal subspace decomposition that provides a suitable subspace for identification of physical mechanisms in intermittent flows. This approach provides a new tool to further our understanding of the fundamental nature of intermittent and independent phenomena in fluid flows. Finally, this technique is tested with experimental data collected at Texas Tech University's Wind Engineering Research Field Laboratory.
AB - In this paper, we develop a new dimension reduction technique, using the projection pursuit approach, to identify underlying physical mechanisms of the flow. By first applying the standard dimension reduction technique-proper orthogonal decomposition (POD), a low-dimensional subspace is defined. POD models of pressure fields have, in the past, been challenged with questions of interpretation in terms of flow mechanisms. To address this issue, the projection criterion is applied to decompose independent physical mechanisms in the non-Gaussian pressure field. This procedure leads to a non-orthogonal subspace decomposition that provides a suitable subspace for identification of physical mechanisms in intermittent flows. This approach provides a new tool to further our understanding of the fundamental nature of intermittent and independent phenomena in fluid flows. Finally, this technique is tested with experimental data collected at Texas Tech University's Wind Engineering Research Field Laboratory.
KW - Intermittent
KW - Pressure fields
KW - Proper orthogonal decomposition
KW - Vortices
KW - Wind
UR - http://www.scopus.com/inward/record.url?scp=0347566168&partnerID=8YFLogxK
U2 - 10.1016/j.jweia.2003.09.041
DO - 10.1016/j.jweia.2003.09.041
M3 - Article
AN - SCOPUS:0347566168
VL - 92
SP - 53
EP - 69
JO - Journal of Wind Engineering and Industrial Aerodynamics
JF - Journal of Wind Engineering and Industrial Aerodynamics
SN - 0167-6105
IS - 1
ER -