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Advanced Numerical Modelling of Wave Structure Interactions

Wave Generation and Absorption Techniques Introduction Review of wave generation and absorption methods Static boundary wave generation and absorption boundary conditions Relaxation zones Internal wave makers Moving wavemakers with active absorption Discussion References Wave Propagation Models for Numerical Wave Tanks Introduction Historical development BEM models FEM models Spectral models Fully Lagrangian models Lagrangian numerical wave model Mathematical formulation Numerical scheme Numerical dispersion relation and dispersion correction Numerical treatment of breaking Numerical efficiency Model validation Model application to the evolution of extreme wave groups Model application to waves on sheared currents Concluding remarks References Wave Breaking and Air Entrainment Introduction Physics of breaking Wave breaker types Flow structure Numerical model Wave breaking of unstable sinusoidal wave Initial configuration Splash-up and large vortical structures A new type of vortical structures under breaking waves Discussion and future work References Air Compressibility and Aeration Effects in Coastal Flows Introduction Flow model for dispersed water waves Mathematical model Numerical Method Treatment of the advection equation Spatial discretisation The HLLC Riemann solver Temporal discretisation Results D problems Free drop of a water column in a closed tank Underwater explosion near a planar rigid wall Water entry of a rigid plate Plunging wave impact at a vertical wall Conclusions References Violent Wave Impacts and Loadings using the δ-SPH Method Introduction Governing equations The δ-SPH scheme Modelling solid bodies The ghost-fluid method Evaluation of Forces and Torques through the ghost-fluid method Algorithm for fluid-body coupling Energy balance Applications Prediction of water impacts Extreme loads on a Wave Energy Converter (WEC)Conclusions References Wave and Structure Interaction Porous Coastal Structures Introduction Literature review Mathematical formulation Definitions RANS equations Volume-Averaged RANS equations Closure Turbulence modelling Discussion Numerical model Applications: Solitary wave impacting into a rubble mound breakwater Numerical setup Numerical results Concluding remarks Applications: Wave and sediment grain interaction by a nonbreaking solitary wave on a steep slope Introduction to DEM Numerical setup Numerical results Concluding remarks Final remarks References CFD Modelling of Scour in Flows with Waves and Currents Introduction Types of sediment transport models in CFD The scourFOAM model Governing equations Numerical solution technique The solver Boundary and initial conditions Solution procedure Model applications D scour application D scour around a complex foundation Conclusions References A Coupling Strategy for Modelling Dynamics of Moored Floating Structures Introduction Uncoupled numerical models Fluid dynamics Solid dynamics An overview of fluid-structure coupling schemes Monolithic schemes Partitioned schemes Coupling instabilities Coupling strategy Fluid-structure coupling Fluid-mooring coupling Mooring-structure coupling Case studies Validation of FSI for floating bodies Validation of mooring model Moored floating bodies: the OC4-DeepCwind validation case Conclusions Appendices A On limitations and way forward B On software development References Future Prospects The lattice Boltzmann method Arbitrary and hybrid Lagrangian-Eulerian models Direct pressure and pressure-marching methods Machine learning Coupled models References

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Numerical Modeling of Microwave–Material Interaction: Microwave-Assisted Methane Decomposition Example
Thermocatalytic decomposition (TCD) of methane in oxygen-free reactor can produce high purity hydrogen without producing carbon oxides. In many literatures, methane TCD requires at least 700°C to carry out in a conventional fixed-bed reactor because it is an endothermic reaction (Asai et ah, 2008; Ayillath...
(Direct Natural Gas Conversion to Value-Added Chemicals)
Numerical modeling of non-stationary nonlinear waves
We consider the processes of formation of the localized nonlinear waves from the initial impulses of deformations. In order to carry out the numerical tests, the program code in C language has been developed. With the use of GNU Compiler Collection we have employed, while carrying out the computations,...
(Linear and Nonlinear Waves in Microstructured Solids: Homogenization and Asymptotic Approaches)
Wave and Structure Interaction Porous Coastal Structures
Poblo Higuera Most coastal structures rely on an energy-dissipation function to fulfil their defence role, therefore it is not surprising that they are tightly linked with porous materials. Energy dissipation, which is enhanced by the porous materials, aids in several important tasks such...
(Advanced Numerical Modelling of Wave Structure Interactions)
Regression Modeling, for Assessment of Interactions/ Synergisms
Interaction, otherwise called synergism, means, that a subgroup performs better on one of the two treatments. This effect is different from that of confounding, where a subgroup performs better for both treatments. The effects of interactions is illustrated above in a table of the study of Groenink et...
(Understanding Clinical Data Analysis: Learning Statistical Principles from Published Clinical Research)
Protein Structures, Interactions and Function from Evolutionary Couplings
Thomas A. Hopf and Debora S. Marks Abstract The sequences of biomolecules such as proteins and RNA genes contain information about their three-dimensional states and functions. For over 40 years biologists have used the evolutionary conservation of this information to detect homology and predict important...
(From Protein Structure to Function with Bioinformatics)
Numerical Model of Current Source to Magnetic Field
Assuming Уф = 0 in the two-dimensional case, the governing equation (4-1), for twodimensional problems can be written as: Considering the orthogonal characteristic of trigonometric functions, substituting magnetic vector A, interpolation functions Ni, magnetic reluctivity v and...
(Harmonic Balance Finite Element Method: Applications in Nonlinear Electromagnetics and Power Systems)
Numerical Model of Voltage Source to Magnetic System
When a transformer of power supply is excited by a voltage source, such as pulse-width modulation (PWM) converters and zero-current switched (ZCS) resonant converters, Figure 4.2 Magnetic system with current-source excitation. (a) Magnetic configuration; (b) Hysteresis characteristic the numerical analysis...
(Harmonic Balance Finite Element Method: Applications in Nonlinear Electromagnetics and Power Systems)
Numerical Model of High-Speed and Hybrid Induction Machine using HBFEM, Taking Account of Motion Effect
The electric machines are usually excited by three-phase voltage sources and connected with an external circuit, as shown in Figure 4.24. In this case, the magnetic field and Figure 4.20 The waveforms of the magnetic flux density distribution for each phase of magnetic leg and output side of magnetic...
(Harmonic Balance Finite Element Method: Applications in Nonlinear Electromagnetics and Power Systems)
Advanced Numerical Approach using HBFEM
HBFEM for DC-Biased Problems in HVDC Power Transformers DC Bias Phenomena in HVDC Transformers are key components in the normal operation of power systems. Typically, they are designed for sinusoidal voltage excitation. Occasionally, direct current (DC) flows through the power transformer...
(Harmonic Balance Finite Element Method: Applications in Nonlinear Electromagnetics and Power Systems)
Numerical models
Many researchers developed numerical models on heat and/or mass transfer through fabric/clothing toward firefighters [34-36,84,98,305]. In this context, four numerical heat and/or mass transfer models (Gibson model, Torvi model, Mell and Lawson model, and Song model) are very popular in the scientific...
(Thermal Protective Clothing for Firefighters)