Year: 2009
Type: article
Abstract: On marine propellers, cavitation appearance and development is critical for performance and erosion considerations. Behind a ship, the propeller experiences all kinds of cavitation types, varying from sheet and bubbles to tip vortex cavitation. When a cavitation analysis is required, two methods are available: experimental or numerical. To find the optimum propeller that fits into different configurations and requirements, designers need accurate predictions within reasonable time. The experimental method is typically used at the end of a design process to verify performance. Therefore, quick and accurate numerical predictions are essential at different stages in the design process, to evaluate performance and cavitation patterns. Mathematical methods range from basic panel codes to the more complex ones, derived from the Navier-Stokes equations. Methods like DES and LES require large meshes and small time steps which makes their usability limited. The most practical viscous numerical method available at the moment in industry is Reynolds Average Navier-Stokes (RANS). The current paper will present the results of a RANS simulation of a 2D sheet cavity and a 3D sheet-tip vortex cavitation. Accurate results of these basic simulations are steps towards the end goal, cavitating propeller simulations. In this method the viscous effects are taken into account with aid of a two equation turbulence model, which results in a reasonably fast approach due to reasonably grids requirements. It is concluded that the RANS method can predict complex 3D sheet-vortex cavitation development and shedding. In addition, it is appropriate for industrial use because it achieves reasonably quick and accurate results. As a next step in the research project, the cavitation development on a propeller will be analyzed with this method.
Authors: Iulia Oprea, Norbert Bulten
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: Mechanisms and Duration of Immunity to SARS-CoV-2, Toward a Universal Influenza Virus Vaccine, Storage and recall of human B cell memory of influenza over tissues and time, G4735757437, G6510019356, Integrating innate and adaptive pathways in vaccine responses, G7901382856, Regulation of the IgG Fc domain repertoire, Effects of aging on primary and secondary vaccine responses in a 15-year longitudinal cohort, FUNCTIONAL ANALYSIS OF PATHOGENIC AND PROTECTIVE PEANUT ALLERGEN-SPECIFIC HUMAN ANTIBODIES, Understanding Influenza and SARS-CoV-2 vaccine responses, in vivo and in vitro, Developing, Demonstrating, and Disseminating Innovative Programs to Achieve Translational Success, Molecular and Cellular Immunobiology
OpenAlex ID: W33169014