Impact of a wedge in water: assessment of the modeling keyword, presence of cavitation and choice of the filter most suitable for the case study
D. Guagliardo, E. Cestino, G. Nicolosi, E. Guarino, A. Virdis, A. Alfero, D. Pittalis, M.L. Sabelladownload PDF
Abstract. The purpose of this paper is to compare the results obtained from a rigid wedge impacting water that is modelled using different techniques based on the SPH (Smoothed Particle Hydrodynamics) method. The study aims to evaluate the quality of the results, optimizing the computational time, which is obtained when the wedge is discretized as a section or as a half of it. The comparison of the results obtained considers the different materials that the ANSYS LS-DYNA software allows to assign to water through different keywords. The effect of cavitation on the pressures reached during the vertical impact was evaluated as a function of ambient temperature. Finally, given the high noise recorded in the pressure files, the study uses a filter created in MATLAB. The latter involves a double pass through the Kalman filter first and the Gauss filter later. All results obtained through the numerical method are compared with Von Karman and Wagner analytical theories.
Fluid-Structure Interaction, SPH, Cavitation, Pressure Filter
Published online 11/1/2023, 5 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: D. Guagliardo, E. Cestino, G. Nicolosi, E. Guarino, A. Virdis, A. Alfero, D. Pittalis, M.L. Sabella, Impact of a wedge in water: assessment of the modeling keyword, presence of cavitation and choice of the filter most suitable for the case study, Materials Research Proceedings, Vol. 37, pp 197-201, 2023
The article was published as article 43 of the book Aeronautics and Astronautics
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
 Cestino, E.; Frulla, G.; Sapienza, V.; Pinto, P.; Rizzi, F.; Zaramella, F.; Banfi, D. (2018) Replica 55 Project: A Wood Seaplane in The Era Of Composite Materials, In: Proc of 31st ICAS 2018 Congress, 9-14 September 2018, Belo Horizonte (Brasil)
 Nicolosi G., Valpiani F., Grilli G., Saponaro Piacente A., Di Ianni L., Cestino E., Sapienza V., Polla A., Piana P. Design Of A Vertical Ditching Test. Proc. 32nd ICAS Congress 6-10 September 2021 – Shanghai, China
 Cestino, E., Frulla, G., Polla, A., Nicolosi, G. (2023). Equivalent Material Identification in Composite Scaled Hulls Vertical Impact Tests. In: Lopresto, V., Papa, I., Langella, A. (eds) Dynamic Response and Failure of Composite Materials. DRAF 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-28547-9_6
 Fragassa C, Topalovic M, Pavlovic A, Vulovic S. Dealing with the Effect of Air in Fluid Structure Interaction by Coupled SPH-FEM Methods. Materials. 2019; 12(7):1162. https://doi.org/10.3390/ma12071162
 Q.W. Ma and D.J. Andrews. On techniques for simulating effects of cavitation associated with the interaction between structures and underwater explosions using LS-DYNA. 3rd European LS-DYNA Conference, Paris, 2001.
 von Kármán T. The impact on seaplane floats during landing. NACA Technical Notes N.321, 1929.
 Wagner H. Über Stoß- und Gleitvorgänge an der Oberfläche von Flüssigkeiten. Zeitschrift Für Angewandte Mathematik Und Mechanik, Vol. 12, No. 4, 1932. https://doi.org/10.1002/zamm.19320120402
 Panciroli R, Pagliaroli T, Minak G. On Air-Cavity Formation during Water Entry of Flexible Wedges. Journal of Marine Science and Engineering. 2018; 6(4):155. https://doi.org/10.3390/jmse6040155
 “Korobkin, A. Cavitation in liquid impact problems. In Proceedings of the Fifth International Symposium on Cavitation (CAV2003), Osaka, Japan, 1 January 2003; Volume 2, pp. 1–7.”
 Keyword Manual, 1999, “LS-DYNA keyword user’s manual”, Livermore Software Technology Corporation.
 F. Valpiani, P. Cicolini, D. Esposto, A. Galletti & D. Guagliardo. Numerical modeling of Fluid-Structure Interactione of a 3D wedge during water impact with variation of velocity and pitch angle. 33rd ICAS Congress 4-9 September 2022 – Stockholm, Sweden
 V, Kutz J N, Brunton B W. Numerical differentiation of noisy data: A unifying multiobjective optimization framework. IEEE Access, Vol. 8, 2020. https://doi.org/10.1109/ACCESS.2020.3034077
 Ma’arif, Alfian & Iswanto, & Nuryono, Aninditya & Alfian, Rio. (2020). Kalman Filter for Noise Reducer on Sensor Readings. Signal and Image Processing Letters. 1. 11-22. https://doi.org/10.31763/simple.v1i2.2