Reduced-order modeling of three-dimensional unsteady partial cavity flows. (January 2015)

• Record Type: Journal Article
• Authors: Behbahani-Nejad, Morteza; Changizian, Maziar
• Is Part Of: Journal of fluids and structures. Volume 52(2015:Jan.)
• Page Start: 1
• Page End: 15
• Publication Date: 2015-01
• Subjects: Reduced order modeling -- Eigenanalysis -- Unsteady flow -- Partial cavity -- Boundary element method -- Three-dimensional hydrofoil; Fluid-structure interaction -- Periodicals; Fluid mechanics -- Periodicals; Structural dynamics -- Periodicals; Structural analysis (Engineering) -- Periodicals; 620.106
• DOI: 10.1016/j.jfluidstructs.2014.08.001
• Languages: English
• ISSNs: 0889-9746

Abstract

Abstract: An efficient reduced-order modeling to analyze three-dimensional unsteady partial cavity flows is proposed. The proposed approach is based on the boundary element method along with the potential flow assumption. To this end, a novel non-iterative method based on the flow eigenmodes of three-dimensional partial cavity flows is applied. Eigenanalysis and reduced-order modeling for unsteady flows over a three-dimensional hydrofoil with various sections are performed. The results obtained from the present analysis are compared with those reported in the literature to verify the strength of the proposed approach. In order to examine the performance of the introduced algorithm for unsteady cavitating flows, various simulations for several reduced frequencies, hydrofoil geometries and different cavitation numbers are also investigated. Comparison between the obtained results using the novel and conventional methods indicates that the present algorithm works very well with sufficient accuracy. Moreover, it is shown that the proposed method is computationally more efficient than the conventional ones for unsteady sheet cavitation analysis on three-dimensional hydrofoils. Highlights: We proposed a new non-iterative approach to analyze 3D unsteady partial cavitation. We attained proper eigenvalues and eigenvectors of 3D unsteady partial cavity flow. An efficient reduced order model for 3D unsteady partial cavity flow is constructed. The proposed ROM can accurately and efficiently predict cavity characteristics.