Numerical modelling of wave-structure interaction problems through cfd methods

Güler, Hasan Gökhan
The major focus of this study is the computational fluid dynamics (CFD) modelling of wave-structure interaction problems. In the first part of this study, the performance of Haydarpaşa Breakwater under tsunami attack is assessed both experimentally and numerically. It is concluded that the major failure mechanism of this breakwater is the sliding of the crown-wall, and the stability of the stones located at the harbour side is also significant. Design recommendations are given based on the stability of the single stone located at the top layer at the harbour side of the breakwater. Next, the motion and collision of two spherical particles under solitary wave attack are studied both experimentally and numerically. The strengths and weaknesses of the two available CFD solvers used in these studies are discussed. In the second part of this study, two CFD solvers are developed and validated using OpenFOAM CFD Library regarding the discussions in the first part. Both models are capable of solving flow properties inside the porous medium, capturing the free-surface using the Volume of Fluid (VOF) Method, and linked to wave generation and absorption boundary conditions previously established in this library. The first CFD solver is based on the body-force immersed boundary method (IBM) for stationary boundaries. VOF method is applied using both algebraic and geometric algorithms in this solver. It is the first time that the geometric method called isoAdvector is used with IBM and within the porous media. This numerical solver is validated against four experimental datasets in comparison with a CFD solver working on conventional body-fitted grids. The second numerical model is based on the cut-cell IBM for both stationary and moving boundaries. This model is the first example that considers the moving boundaries, free-surface, porous media flow and wave generation/absorption in the same numerical model and validated against data from an analytical study.


Numerical Aspects of POD-Based Reduced-Order Modeling forDarcy-Brinkman Equations
Güler Eroğlu, Fatma; Kaya Merdan, Songül (2018-10-21)
We propose, analyze and test a reduced order modelling with proper orthogonal decomposition (POD) method for the modeling to flows governed by double diffusive convection, which models flow driven by two potentials with different rates of diffusion. We present a theoretical analysis of the method and give results for various numerical tests on benchmark problems that will demonstrate both the theory and the effectiveness of the proposed method.
Numerical and experimental investigation of damping in a dam-break problem with fluid-structure interaction
Demir, Abdullah; Dincer, Ali Ersin; Bozkuş, Zafer; Tijsseling, Arris S. (Zhejiang University Press, 2019-04-01)
There have been few experimental and numerical studies on damping effects in fluid-structure interaction (FSI) problems. Therefore, a comprehensive experimental study was conducted to investigate such effects. In experiments, a water column in a container was released and hit a rubber plate. It continued its motion until hitting a downstream wall where pressure transducers had been placed. The experiments were repeated using rubber plates with different thickness and material properties. Free-surface profil...
Parallel Computation of 3-D Viscous Flows on Hybrid Grids
Ilgaz, Murat; Tuncer, İsmail Hakkı (2009-10-12)
In this study, a newly developed parallel finite-volume solver for 3-D viscous flows on hybrid grids is presented. The boundary layers in wall bounded viscous flows are discretized with hexahedral cells for improved accuracy and efficiency, while the rest of the domain is discretized by tetrahedral and pyramidal cells. The computations are performed in parallel in a computer cluster. The parallel solution algorithm with hybrid grids is based on domain decomposition which is obtained using the graph partitio...
Thermal analysis applications in fossil fuel science - Literature survey
Kök, Mustafa Verşan (2002-01-01)
In this study, instances where thermal analysis techniques ( differential scanning calorimetry, thermogravimetry, differential thermal analysis, etc.) have been applied for fossil fuel characterisation and kinetics are reviewed. The scientific results presented clearly showed that thermal analysis is a well-established technique used in fossil fuel research area. The literature survey showed that thermal methods were important not only theoretically but also from a practical point of view.
Tuerker, Lemi; Atalar, Taner; Guemues, Selcuk (Informa UK Limited, 2009-01-01)
Computational studies on tetranitro derivatives of [2,2]paracyclophane are carried out at B3LYP/6-31G(d,p) level of theory. Optimized geometries, electronic structures and some thermodynamic properties have been obtained in their ground states. Also, detonation performances were evaluated by the Kamlet-Jacobs equations, based on the quantum-chemical calculated densities and heat of formation values. Aromaticities were investigated by performing NICS (nucleus independent chemical shift) calculations using th...
Citation Formats
H. G. Güler, “Numerical modelling of wave-structure interaction problems through cfd methods,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2020.