Naslov
Lagrangian Finite Difference Method for Violent Fluid–Structure Interaction

Autori
Bašić, Josip ; Blagojević, Branko ; Ban, Dario ; Ljubenkov, Boris ; Degiuli, Nastia

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 32nd Symposium on Naval Hydrodynamics / Abdel-Maksoud, M. - Hamburg, 2018

Skup
32nd Symposium on Naval Hydrodynamics

Mjesto i datum
Hamburg, Njemačka, 05.08.2018. - 10.08.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Finite differences ; Free surface ; CFD ; Slamming ; Sloshing ; Green water

Sažetak
A meshless Lagrangian methodology is proposed for the purpose of numerical simulation of incompressible flows and estimation of hydrodynamic loads during fluid-structure impacts. The methodology can handle and simulate violent fluid-structure interaction with free surface fragmentation. It relies on so-called renormalised spatial operators that are described in mesh-free finite difference (MFD) context. The following novelties are introduced: Lagrangian pressure Poisson equation (PPE) formulation of the Navier– Stokes equations (NSE) is used to evolve fluid flow, the Poisson equation is solved in strong form by employing a novel discrete Laplacian, boundaries are represented by directly importing geometry models without volumetric meshing, and volume-conservative Lagrangian advection is handled by solving a set of geometrical constraints, which allows slight compressibility when needed. The proposed method is validated by simulating six experiments from the literature, and by comparing computed flow characteristics to the experimental data. The experiments include two-dimensional water entries of rigid bodies, dam breaking, and sloshing problems. Results of the simulations were found to be in good agreement with the experimental data. The proposed method's applicability to the estimation of hydrodynamic loads for three dimensional impacts will be assessed in future work.

Izvorni jezik
Engleski

Znanstvena područja
Brodogradnja, Interdisciplinarne tehničke znanosti

POVEZANOST RADA