每年出版 6 期
ISSN 打印: 2152-5102
ISSN 在线: 2152-5110
Indexed in
DIFFERENT APPROACHES TO APPLYING POD ANALYSIS TO 3D3C DATA IN A LARGE MEASUREMENT VOLUME
摘要
Proper orthogonal decomposition (POD) analysis is performed on volumetric three-component data of a threedimensional flow field. A flow field with 3D vortical structures is selected to examine the "robustness" of the POD analysis in a relatively large measurement domain. These POD results are evaluated in how well they capture the vortical structures in the flow field. Moreover, the POD results of the entire domain are compared to POD analysis applied to subdomains. The subdomain POD analyses include smaller 3D domains, and 2D planes with two or three components of the velocity. Results of the POD analysis of the entire domain capture all the structures in the flow; however, the vortical structures are identified more efficiently in the subdomains. The results also show that confining the subdomains in a direction where the vortices are continuous does not affect the POD spatial modes. The best results are obtained when the POD analysis is applied to a 2D plane perpendicular to the axis of rotation of the vortices. Moreover, a brief discussion is provided about the differences between POD analysis performed using a covariance matrix containing the three velocity vectors and using three covariance matrices for the three components of the vector.
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