Print Email Facebook Twitter On the accuracy of predicting cavitation impact loads on marine propellers Title On the accuracy of predicting cavitation impact loads on marine propellers Author Melissaris, Themistoklis (TU Delft Ship Hydromechanics and Structures; Wärtsilä Netherlands BV) Schenke, S. (TU Delft Ship Hydromechanics and Structures) Bulten, Norbert (Wärtsilä Netherlands BV) van Terwisga, T.J.C. (TU Delft Ship Hydromechanics and Structures; Maritime Research Institute Netherlands (MARIN)) Date 2020 Abstract Predicting the cavitation impact loads on a propeller surface using numerical tools is becoming essential, as the demand for more efficient designs, stretched to the limit, is increasing. One of the possible design limits is governed by cavitation erosion. The accuracy of estimating such loads, using a URANS approach, has been investigated. We follow the energy balance approach by (Schenke and van Terwisga, 2019), (Schenke et al., 2019), where we take account of the focusing of the potential energy into the collapse center before it is radiated as shock wave energy in the domain. In complex flows, satisfying the total energy balance, when reconstructing the radiated energy, has always been an issue in the past. Therefore, in this study, we investigate different considerations for the vapor reduction rate, in order to minimize the numerical errors, when estimating the local surface impact power. We show that when the vapor volume reduction rate is estimated using the mass transfer source term, then all the energy is conserved and the total energy balance is satisfied. The model is verified on a single cavitating bubble collapse, and it is further validated on a model propeller test case. The obtained surface impact distribution agrees well with the experimental paint test results, illustrating the potential for practical use of our fully conservative method to predict cavitation implosion loads on propeller blades. Subject Blade surface impact distributionCavitation ErosionCavitation impact loadNumerical errorSingle bubble collapseURANS To reference this document use: http://resolver.tudelft.nl/uuid:24ec3804-566d-4a62-ada9-4d8bd0681eff DOI https://doi.org/10.1016/j.wear.2020.203393 ISSN 0043-1648 Source Wear, 456-457 Part of collection Institutional Repository Document type journal article Rights © 2020 Themistoklis Melissaris, S. Schenke, Norbert Bulten, T.J.C. van Terwisga Files PDF 1_s2.0_S0043164819316679_main.pdf 3.51 MB Close viewer /islandora/object/uuid:24ec3804-566d-4a62-ada9-4d8bd0681eff/datastream/OBJ/view