Numerical investigation of the porpoising motion of a seaplane planing on water with high speeds

On applicability of von Karman's momentum theory in predicting the water entry load of V-shaped structures with varying initial velocity

“…In general, hydrodynamics of water impacting can be demonstrated commendably by scaled model water tank tests. In the case of seaplanes, both hydrodynamics and aerodynamic aspects play the same key roles in the dynamic behavior and there is however a difficulty in achieving the correct scaling for the air and water domains (Duan et al, 2019). Froude ( ) scaling guarantees the correct reproduction of the ratio between the inertia and gravity force in the water domain but it do not allow to preserve the Reynolds ( ) similarity and thus the correct scaling of the viscous effects which are important in both water and, especially, in air for the aerodynamic lift and drag (Terziev et al, 2022;Iafrati and Grizzi, 2019).…”

“…The whole process was divided into a number of small time-step, and the forces were calculated at each time step. In (Duan et al, 2019) evaluated the porpoising motion, an unstable oscillation phenomenon that threatens the flying safety of amphibious aircrafts, by using a two-phase flow solver in OpenFOAM. Both slipstream caused by the propeller and external forces, viz.…”

A Numerical Study of Spray Strips Analysis on Fridsma Hull Form

“…Studies on this issue have been conducted to predict the total drag of fast ships [11,12]. The other study, Fridsma hull was used for numerical verification of OpenFOAM code in seaplane simulation during takeoff [13].…”

Formulations of Hydrodynamic Force in the Transition Stage of the Water Entry of Linear Wedges with Constant and Varying Speeds

“…1), where the 2D water entry model is formulated by the added mass method [4,1,2] or the Wagner theory [5,3]. The traditional procedures had been identified to be less accurate as the numerical methods have fast developed in recent decades, and make it possible to conduct numerical simulations of water-landing of seaplanes [6] and transport airplanes [7,8]. Although a whole-time history of water entry of aircraft can be reproduced, massive computational resources are required and several days of calculations are taken.…”