PREDICTED FUEL-SAVINGS FOR A FLETTNER ROTOR ASSISTED TANKER USING COMPUTATIONAL FLUID DYNAMICS

2019 ◽  
Author(s):  
L Jones ◽  
M Prince ◽  
D Hudson ◽  
J Cocks
Keyword(s):  
Fluid Dynamics ◽  
Fuel Savings ◽  
Rotor Design ◽  
Induced Flow ◽  
Aerodynamic Modelling ◽  
Hull Forms ◽  
Dynamics Simulations ◽  
Prediction Approach ◽  
The Impact

This paper presents a case study of the effectiveness of Flettner rotors as a wind-assist system for tanker hull forms with particular focus on the aerodynamic modelling of the devices. It summarises a series of computation fluid dynamics simulations carried out to evaluate the impact of parametric changes in Flettner rotor design, including the impact of multiple rotors operating in combination, and the influence of the ship induced flow field. The results of these simulations have been applied within a velocity performance prediction approach to estimate reductions in thrust required from the propeller, and hence changes in engine power and fuel consumption in realistic operations. The analysis highlights Flettner rotors as a means of providing significant levels of power assistance dependent upon true wind speed, heading and ship speed.

A CASE STUDY ON STABILISER FIN-HULL INTERACTION USING CFD AND MODEL EXPERIMENTS

2021 ◽  
Vol 157 (A4) ◽  
Author(s):  
K A Bhosale ◽  
J T Duffy
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Physical Model ◽  
Free Stream ◽  
Angle Of Attack ◽  
Model Experiments ◽  
Stream Condition ◽  
Hull Forms ◽  
Lift And Drag

A case study was conducted to investigate and quantify stabiliser fin-hull interaction using a combination of Computational Fluid Dynamics and physical model experiments. The fin-hull interaction was studied by comparing the lift and drag of a stabiliser fin in a free stream condition and when attached to a hull. The findings of this case study showed that using free stream fin characteristics to predict performance of a stabiliser fin fitted to the hull resulted in an over-prediction of drag by up to 46% and under-prediction of lift by up to 75% for the speeds and angle of attack analysed. These discrepancies are for this case study only and in practice will vary for different hull forms, fin types, fin location and angles of attack. However, the research highlights the limitations of using free stream fin characteristics to predict the performance of a fin fitted to a hull.

scholarly journals Computational Fluid Dynamics Simulations for Investigation of the Damage Causes in Safety Elements of Powered Roof Supports—A Case Study

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1027
Author(s):  
Janina Świątek ◽  
Tomasz Janoszek ◽  
Tomasz Cichy ◽  
Kazimierz Stoiński
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Rock Burst ◽  
Hydraulic System ◽  
Damage Mechanism ◽  
Strength Analysis ◽  
Safety And Health ◽  
The Stability ◽  
Dynamics Simulations

The paper describes a case study of the safety hydraulic system damage in the working of a longwall in a Polish coal mine. The safety elements are a component of the powered roof supports which secure the shield against damage during rock burst incidents. The damage event, which occurred in the hydraulic system during the mining process, caused the uncontrolled lowering of the powered roof support height during the mining process. The uncontrolled lowering of a shield may cause the danger of the loss of the stability along the longwall working in the form of a rock burst and collapses and may represent a serious and immediate danger to the safety and health of employees. Based on the results of the computational fluid dynamics methods (CFD) analysis of the safety elements in the hydraulic system of longwall 2-leg shield, the causes of damage were diagnosed and presented. The CFD and the strength analysis by the finite element method (FEM) were used for numerical modeling. The diagrams and maps of changes of parameters having an impact on the damage mechanism in safety elements of the hydraulic leg were developed based on the results of model tests. The forecasted values of stress distributions in the safety system of the hydraulic leg have made it possible to identify the reasons of the damage causes, verified by real observations.

scholarly journals Computational fluid dynamics simulations of the impact of a water spray on a fire-induced smoke layer inside a hood

2018 ◽  
Vol 36 (5) ◽  
pp. 380-405 ◽  
Author(s):  
Zhi Tang ◽  
Zheng Fang ◽  
Jiayun Sun ◽  
Tarek Beji ◽  
Bart Merci
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Sensitivity Study ◽  
Spray Angle ◽  
Water Spray ◽  
Smoke Layer ◽  
Computational Fluid Dynamics Simulations ◽  
Simulation Results ◽  
Dynamics Simulations ◽  
The Impact

This article presents computational fluid dynamics results of the impact of a water spray on the fire smoke layer inside a hood. The models and the settings of parameters are discussed. Three experiments are performed by means of computational fluid dynamics simulations, and the comparisons show good agreement between measured data and predicted results. The simulation results provide insight into the temperature and flow fields for the configuration at hand, revealing an entrainment effect. The influence of the water spray characteristics on the downward smoke displacement due to drag and cooling is explained. Furthermore, an extensive sensitivity study of the simulation results to input parameters and mesh size is performed. The inner spray angle (related to vertical water flux) and droplet size are shown to be key parameters when simulating downward smoke displacement caused by a spray.

scholarly journals Influence of the Slag Density on the Splashing Process in a Steelmaking Converter

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Miguel A. Barron ◽  
Dulce Y. Medina ◽  
Isaias Hilerio ◽  
Gabriel Plascencia
Keyword(s):  
Fluid Dynamics ◽  
Volume Fraction ◽  
Two Dimensional ◽  
Average Volume ◽  
Qualitative Comparison ◽  
Slag Splashing ◽  
Computational Fluid Dynamics Simulations ◽  
Oxygen Steelmaking ◽  
Dynamics Simulations ◽  
The Impact

The way in which slag density influences the slag splashing phenomenon in an oxygen steelmaking converter is numerically analyzed in this work. Several values of the density of the slag are considered, and their effect on the global mass balance and slag average volume fraction on the sidewalls of the converter is studied using isothermal, two-dimensional transient computational fluid dynamics simulations. Diameter of the slag drops is determined from the slag density and the impact velocity of the nitrogen jet. Besides, the effect of the nitrogen jet Mach number on the slag splashing is simulated and discussed. A qualitative comparison between the computer simulations and results from the literature is made.

A Case Study on Stabiliser Fin-Hull Interaction Using CFD and Model Experiments

2015 ◽  
Vol 157 (A4) ◽  
pp. 227-234
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Physical Model ◽  
Free Stream ◽  
Angle Of Attack ◽  
Model Experiments ◽  
Stream Condition ◽  
Hull Forms ◽  
Lift And Drag

A case study was conducted to investigate and quantify stabiliser fin-hull interaction using a combination of Computational Fluid Dynamics and physical model experiments. The fin-hull interaction was studied by comparing the lift and drag of a stabiliser fin in a free stream condition and when attached to a hull. The findings of this case study showed that using free stream fin characteristics to predict performance of a stabiliser fin fitted to the hull resulted in an over-prediction of drag by up to 46% and under-prediction of lift by up to 75% for the speeds and angle of attack analysed. These discrepancies are for this case study only and in practice will vary for different hull forms, fin types, fin location and angles of attack. However, the research highlights the limitations of using free stream fin characteristics to predict the performance of a fin fitted to a hull.

The Impact of Different Types of Permeable Pavement Utilization on Air Temperature above the Pavement

2013 ◽  
Vol 723 ◽  
pp. 678-685 ◽  
Author(s):  
Jyh Dong Lin ◽  
Chen Yu Hsu ◽  
Andika Citraningrum ◽  
Putri Adhitana
Keyword(s):  
Fluid Dynamics ◽  
Air Temperature ◽  
Asphalt Concrete ◽  
Cfd Simulation ◽  
Concrete Block ◽  
Permeable Pavement ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd ◽  
The Impact

This study investigate permeable pavement utilization and its impact on air temperature by using site measurement, statistical analysis, and Computational Fluid Dynamics (CFD) simulation. National Central University (NCU) main library is the case study for the simulations. Simulations on five pavement types (dense grade asphalt concrete/DGAC, permeable asphalt concrete/PAC, concrete, permeable interlocking concrete block/PICB, and grass block) shows that grass block and PICB can reduce air temperature, while three others increase air temperature.

scholarly journals Open-Source Software in Computational Research: A Case Study

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
Madhava Syamlal ◽  
Thomas J. O'Brien ◽  
Sofiane Benyahia ◽  
Aytekin Gel ◽  
Sreekanth Pannala
Keyword(s):  
Open Source ◽  
Software Quality ◽  
Open Source Software ◽  
Research Software ◽  
Computational Fluid Dynamics Simulations ◽  
Computational Research ◽  
Research And Education ◽  
Dynamics Simulations ◽  
The Impact

A case study of open-source (OS) development of the computational research software MFIX, used for multiphase computational fluid dynamics simulations, is presented here. The verification and validation steps required for constructing modern computational software and the advantages of OS development in those steps are discussed. The infrastructure used for enabling the OS development of MFIX is described. The impact of OS development on computational research and education in gas-solids flow, as well as the dissemination of information to other areas such as geophysical and volcanology research, is demonstrated. This study shows that the advantages of OS development were realized in the case of MFIX: verification by many users, which enhances software quality; the use of software as a means for accumulating and exchanging information; the facilitation of peer review of the results of computational research.

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