Reduced-order description of fluid flow with moving boundaries by proper orthogonal decomposition

@article{citeulike:1386649, abstract = {The approach of proper orthogonal decomposition (POD) has been extensively adopted for fluid dynamics in fixed geometries. This technique is examined here for fluid flow with moving boundaries; in the context of cavitating and phase change flows, and fluid-membrane interaction. The purpose is to assess the capability of POD in extracting the salient features and offering a compact representation to the CFD solutions associated with boundary movement. The cavitating flow simulations are investigated to distill the effect of turbulence modeling, between the Launder-Spalding and a filter-based turbulence models. The lower-order eigenmodes of the flow field, for both turbulence models, show different flow structures and global parameters between higher and lower cavitation numbers. The effect of multi-timescales produced by the filter-based turbulence model is discerned by POD analysis. For 3-D, membrane wing flows, very few POD modes seem sufficient for accurate representation of the velocity field. However, reduced-order analysis of the aerodynamic performance, which is strongly dictated by pressure, may be coarsened by moving membrane dynamics. The flow with fusion is further considered for its solid-liquid phase front propagation. While few modes can sufficiently construct the flow field for the later interval of the flow, a larger number of POD modes are required to provide the flow scales for the initial part of the phase change process.}, author = {Utturkar, Yogen and Zhang, Baoning and Shyy, Wei }, citeulike-article-id = {1386649}, journal = {International Journal of Heat and Fluid Flow}, keywords = {moving-boundaries, pod}, month = {April}, number = {2}, pages = {276--288}, posted-at = {2007-06-13 08:08:12}, priority = {3}, title = {Reduced-order description of fluid flow with moving boundaries by proper orthogonal decomposition}, url = {http://www.sciencedirect.com/science/article/B6V3G-4DKH2YD-1/2/36325b7e56c94ed8c630b0be51ccb978}, volume = {26}, year = {2005} }

TY - JOUR ID - citeulike:1386649 L3 - citeulike-article-id:1386649 TI - Reduced-order description of fluid flow with moving boundaries by proper orthogonal decomposition JF - International Journal of Heat and Fluid Flow VL - 26 IS - 2 SP - 276 EP - 288 N2 - The approach of proper orthogonal decomposition (POD) has been extensively adopted for fluid dynamics in fixed geometries. This technique is examined here for fluid flow with moving boundaries; in the context of cavitating and phase change flows, and fluid-membrane interaction. The purpose is to assess the capability of POD in extracting the salient features and offering a compact representation to the CFD solutions associated with boundary movement. The cavitating flow simulations are investigated to distill the effect of turbulence modeling, between the Launder-Spalding and a filter-based turbulence models. The lower-order eigenmodes of the flow field, for both turbulence models, show different flow structures and global parameters between higher and lower cavitation numbers. The effect of multi-timescales produced by the filter-based turbulence model is discerned by POD analysis. For 3-D, membrane wing flows, very few POD modes seem sufficient for accurate representation of the velocity field. However, reduced-order analysis of the aerodynamic performance, which is strongly dictated by pressure, may be coarsened by moving membrane dynamics. The flow with fusion is further considered for its solid-liquid phase front propagation. While few modes can sufficiently construct the flow field for the later interval of the flow, a larger number of POD modes are required to provide the flow scales for the initial part of the phase change process. KW - moving-boundaries KW - pod AU - Utturkar, Yogen AU - Zhang, Baoning AU - Shyy, Wei PY - 2005/04// UR - http://www.sciencedirect.com/science/article/B6V3G-4DKH2YD-1/2/36325b7e56c94ed8c630b0be51ccb978 ER -