scholarly journals A CFD STUDY ON THE STRUCTURAL RESPONSE OF A SLOPING TOP CAISSON

2017 ◽  
pp. 41
Author(s):  
Mohammad Daliri ◽  
Fabio Dentale ◽  
Daniela Salerno ◽  
Mariano Buccino
Keyword(s):  
Wave Field ◽  
Structural Response ◽  
Design Methods ◽  
Transmitted Wave ◽  
Wave Overtopping ◽  
Preliminary Results ◽  
Conventional Design ◽  
Impulsive Loadings

The paper discusses preliminary results of a CFD study on the structural response of a Sloping Top Breakwater subject to wave overtopping. The analysis showed that the transmitted wave field act to increase both the landward and the seaward forces and that the conventional design methods may be not adequate to guarantee an appropriate degree of safety to the structure. The study also confirmed the previous finding by Walkden et al. (2001), which noticed the existence of strong impulsive loadings on the inner face of the wall, due to violent overtopping events.

Parameter Optimization of Virtual Impedance for Parallel Inverter

2014 ◽  
Vol 986-987 ◽  
pp. 1973-1976
Author(s):  
Ping Wang ◽  
Liu Yang
Keyword(s):  
Parameter Optimization ◽  
Dynamic Performance ◽  
Design Methods ◽  
New Method ◽  
Conventional Design ◽  
Equivalent Impedance ◽  
Novel Method ◽  
Virtual Impedance ◽  
Frequency Curves ◽  
Parallel Inverter

This paper deals with parameter optimization of virtual impedance of parallel inverter. Conventional design methods determine parameters by observing the changes of amplitude-frequency and phase frequency curves of the equivalent impedance. However, those methods always neglect the dynamic performance of inverters in parallel. This paper proposes a novel method to optimize the coefficients of virtual impedance and experiments show that new method improves the dynamic performance of parallel inverter effectively, as well as stability and flexibility.

scholarly journals Simulating Nearshore Wave Processes Utilizing an Enhanced Boussinesq-Type Model

Modelling ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 686-705
Author(s):  
Anastasios Metallinos ◽  
Michalis Chondros ◽  
Andreas Papadimitriou
Keyword(s):  
Wave Propagation ◽  
Wave Field ◽  
Real Life ◽  
Wave Model ◽  
Coastal Areas ◽  
Type Model ◽  
Wave Overtopping ◽  
Daunting Task ◽  
Wide Range ◽  
Computational Resources

The simulation of wave propagation and penetration inside ports and coastal areas is of paramount importance to engineers and scientists desiring to obtain an accurate representation of the wave field. However, this is often a rather daunting task due to the complexity of the processes that need to be resolved, as well as the demanding levels of required computational resources. In the present paper, the enhancements made on an existing sophisticated Boussinesq-type wave model, concerning the accurate generation of irregular multidirectional waves, as well as an empirical methodology to calculate wave overtopping discharges, are presented. The model was extensively validated against 4 experimental test cases, covering a wide range of applications, namely wave propagation over a shoal, wave penetration in ports through a breakwater gap, wave breaking on a plane sloping beach, and wave overtopping behind breakwaters. Good agreement of the model results with all experimental measurements was achieved, rendering the wave model a valuable tool in real-life applications for engineers and scientists desiring to obtain accurate solutions of the wave field in wave basins and complex coastal areas, while keeping computational times at reasonable levels.

Modeling and Visualization of the Requirements and System for Supporting System Development

2005 ◽  
Author(s):  
Takashi Niwa ◽  
Kazuhiro Aoyama
Keyword(s):  
Design Method ◽  
System Development ◽  
Requirements Analysis ◽  
Design Methods ◽  
Process Models ◽  
Design Model ◽  
Supporting System ◽  
Conventional Design ◽  
Proposed Model ◽  
Future Work

Various process models have been proposed for system development, which represent all stages from requirements analysis to implementations and tests. However, these process models focus not on improvement of the model of the system itself but on the development of processes to adapt to the properties of the requirements in system development. First, we arranged the features of system development. Then, we modeled the requirements and a system, and propose here a design method by which the customer and designer can always check requirements by introducing not plural design methods using various conventional design model figures but a unified multiphase design method, even if the designer does not implement the system. The customer and designer can check the requirements using the animations of the scenarios described as requirements. Finally, we present an example of execution, which designs a system using the proposed model, and describe avenues for future work.

Aerodynamic Turbine Design for an Oxy-Fuel Combined Cycle

2016 ◽  
Author(s):  
Adrian Dahlquist ◽  
Magnus Genrup
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
Thermal Power ◽  
Design Methods ◽  
Combined Cycle ◽  
Working Fluid ◽  
3D Analysis ◽  
Conventional Design ◽  
Turbine Design

The oxy-fuel combined cycle (OCC) is one of several carbon capture and sequestration (CCS) technologies being developed to reduce CO2 emissions from thermal power plants. The OCC consists of a semi-closed topping Bryton cycle, and a traditional bottoming Rankine cycle. The topping cycle operates with a working medium mixture of mainly CO2 and H2O. This CO2-rich working fluid has significantly different gas properties compared to a conventional open gas turbine cycle, which thereby affects the aerodynamic turbine design for the gas turbine units. The aerodynamic turbine design for oxy-fuel gas turbines is an unexplored research field. The topic of this study was therefore to investigate the aerodynamic turbine design of turbines operating with a CO2-rich working fluid. The investigation was performed through a typical turbine aero-design loop, which covered the 1D mid-span, 2D through-flow, 3D blade profiling design and the steady-state 3D analysis. The design was performed through the use of conventional design methods and criteria in order to investigate if any significant departures from conventional turbine design methods were required. The survey revealed some minor deviations in design considerations, yet it showed that the design is feasible with today’s state-of-the-art technology by using conventional design practice and methods. The performance of the oxy-fuel combined cycle was revised based on the performance figures from the components design. The expected total performance figures for the oxy-fuel combined cycle were calculated to be a net electrical power of 119.9 MW and a net thermal efficiency of 48.2%. These figures include the parasitic consumption for the oxygen production required for the combustion and the CO2 compression of the CO2 bleed stream.

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