Print Email Facebook Twitter Pressure reconstruction from PIV measurements in the bow region of a fast ship Title Pressure reconstruction from PIV measurements in the bow region of a fast ship Author Jacobi, G. (TU Delft Ship Hydromechanics and Structures) Thill, C.H. (TU Delft Ship Hydromechanics and Structures) Huijsmans, R.H.M. (TU Delft Ship Hydromechanics and Structures) Date 2022 Abstract The paper presents velocity measurements, using particle image velocimetry, as well as a reconstruction of hydrodynamic pressures for the analysis of fast ships. Stereoscopic PIV measurements with a towed underwater PIV system are conducted during towing tank tests to obtain the velocity field in the bow region of a fast ship at speeds up to Fr=0.8. While the model is kept at a fixed trim and sinkage, multi-plane PIV measurements with a total of 68 measurement planes are conducted to reconstruct a volumetric representation of the time-averaged velocity field in the bow region. The obtained velocity field is subsequently used for a volumetric description of the time-averaged hydrodynamic pressure field. In addition to these captive runs, forced oscillation tests are conducted. During these tests, the flow field is recorded in three successive planes to obtain a local phase-averaged description of the velocity and its gradients for the reconstruction of the phase-averaged hydrodynamic pressure field. The postprocessing procedure for the pressure reconstruction, including the solution of the Poisson equation, is implemented into the open-source CFD package OpenFOAM. For the detection of the free surface and the ship hull, an automated procedure is presented. Experimental results are finally compared to results from numerical simulations. Results show that the PIV method is capable of capturing the flow characteristics in the bow region of a fast ship. In addition, it can be used together with the pressure Poisson equation to obtain the hydrodynamic pressure field. However, large out-of-plane velocities require a large dynamic range, which limits the resolution of local effects close to the ship hull. Subject High-speed-craftParticle image velocimetryPressure reconstruction To reference this document use: http://resolver.tudelft.nl/uuid:3e8727bb-119e-4123-812f-bf4995ff421d DOI https://doi.org/10.1016/j.oceaneng.2021.110318 ISSN 0029-8018 Source Ocean Engineering, 252 Part of collection Institutional Repository Document type journal article Rights © 2022 G. Jacobi, C.H. Thill, R.H.M. Huijsmans Files PDF 1_s2.0_S0029801821016206_main.pdf 4.54 MB Close viewer /islandora/object/uuid:3e8727bb-119e-4123-812f-bf4995ff421d/datastream/OBJ/view