Effective and Efficient Breakwater Design for Trading Vessels and FPSOS

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Kamlesh Varyani ◽  
Trevor Hodgson ◽  
Xuan Pham
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cost Effective ◽  
Green Water ◽  
Design Criteria ◽  
Forward Speed ◽  
Water Loading ◽  
Supporting Structure ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd

Breakwaters obviously need to fulfill their function (protecting sensitive structures or cargo) while at the same time remaining intact and imposing manageable loads onto supporting structure. It goes without saying that such breakwaters should be cost effective, so that complex designs with extensive welding may not be preferable. In this paper the authors discuss green water loading on breakwaters for trading vessels like container ships which have forward speed and FPSOs which have zero speed. Different generic designs of V shape, vane type, double skin with and without holes, and forward sloping forecastle (whaleback deck) breakwaters applied to trading vessels are discussed. Guidelines for modeling green water horizontal loading on breakwaters of FPSOs and trading vessels using computational fluid dynamics (CFD) techniques are provided. The paper will also include a review of breakwater design criteria in rules and regulations.

Effective and Efficient Breakwater Design for Trading Vessels and FPSOs

2006 ◽  
Author(s):  
Kamlesh Varyani ◽  
Trevor Hodgson ◽  
Xuan Pham
Keyword(s):  
Cost Effective ◽  
Green Water ◽  
Design Criteria ◽  
Forward Speed ◽  
Water Loading ◽  
Supporting Structure ◽  
Horizontal Loading ◽  
Double Skin

Breakwaters obviously need to fulfil their function (protecting sensitive structures or cargo) while at the same time remaining intact and imposing manageable loads onto supporting structure. It goes without saying that such breakwaters should be cost effective, so that complex designs with extensive welding may not be preferable. In this paper the authors will discuss green water loading on breakwaters for trading vessels like container ships which have forward speed and FPSOs which have zero speed. Different generic designs of V shape, vane type, double skin with and without holes and forward sloping forecastle (whaleback deck) breakwaters applied to trading vessels will be discussed. Guidelines for modelling green water horizontal loading on breakwaters of FPSOs and trading vessels using CFD techniques will be provided. The paper will also include a review of breakwater design criteria in rules and regulations.

CFD Modeling and Modification of Cleanroom Design to Achieve ISO Class 6 Performance

2015 ◽  
Vol 58 (1) ◽  
pp. 1-6
Author(s):  
Richard H Morrison ◽  
Bradley K Hodges
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Microelectromechanical Systems ◽  
Cfd Modeling ◽  
Design Criteria ◽  
Multichip Modules ◽  
Wet Processing ◽  
Modeling Software ◽  
Computational Fluid Dynamics Cfd ◽  
Particle Counts

The Charles Stark Draper Laboratory Microfabrication Lab, located in Cambridge, Massachusetts, was commissioned in November 2012. The design and construction of this lab was discussed in a previous paper.[1] The laboratory comprises an area of 700.1 m2 (7545 ft2) under filter with 280 m2 (3014 ft2) of clean chase space, divided into 11 distinct cleanrooms. This paper focuses on the design and operation of one ISO Class 6 [2] cleanroom (3335) used for wet processing of microelectromechanical systems (MEMS) and multichip modules (MCM). The initial design criteria are discussed, along with installation of the tools and the non-compliance of ISO Class 6 particle counts. Based on these results, computational fluid dynamics (CFD) modeling software was employed to study the airflow in the room and modify the airflow to be compliant with ISO Class 6 standards.

Efficiency prediction for storage chambers using computational fluid dynamics

1996 ◽  
Vol 33 (9) ◽  
pp. 163-170 ◽  
Author(s):  
Virginia R. Stovin ◽  
Adrian J. Saul
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Stress ◽  
Particle Tracking ◽  
Critical Value ◽  
Complex Geometries ◽  
Bed Shear Stress ◽  
Breadth Ratio ◽  
Computational Fluid Dynamics Cfd ◽  
Simulated Flow

Research was undertaken in order to identify possible methodologies for the prediction of sedimentation in storage chambers based on computational fluid dynamics (CFD). The Fluent CFD software was used to establish a numerical model of the flow field, on which further analysis was undertaken. Sedimentation was estimated from the simulated flow fields by two different methods. The first approach used the simulation to predict the bed shear stress distribution, with deposition being assumed for areas where the bed shear stress fell below a critical value (τcd). The value of τcd had previously been determined in the laboratory. Efficiency was then calculated as a function of the proportion of the chamber bed for which deposition had been predicted. The second method used the particle tracking facility in Fluent and efficiency was calculated from the proportion of particles that remained within the chamber. The results from the two techniques for efficiency are compared to data collected in a laboratory chamber. Three further simulations were then undertaken in order to investigate the influence of length to breadth ratio on chamber performance. The methodology presented here could be applied to complex geometries and full scale installations.

Improvement of real-scale raceway bioreactors for microalgae production using Computational Fluid Dynamics (CFD)

2021 ◽  
Vol 54 ◽  
pp. 102207
Author(s):  
Cristian Inostroza ◽  
Alessandro Solimeno ◽  
Joan García ◽  
José M. Fernández-Sevilla ◽  
F. Gabriel Acién
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Computational Fluid Dynamics Cfd ◽  
Real Scale

scholarly journals Design of Novel Flash Ironmaking Reactors for Greatly Reduced Energy Consumption and CO2 Emissions

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 332
Author(s):  
Hong Yong Sohn ◽  
De-Qiu Fan ◽  
Amr Abdelghany
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Large Diameter ◽  
Reduction Reaction ◽  
The Novel ◽  
Height Ratio ◽  
Fine Iron ◽  
Computational Fluid Dynamics Cfd ◽  
High Reduction ◽  
Iron Ore Concentrate

The development of a novel ironmaking technology based on fine iron ore concentrate in a flash reactor is summarized. The design of potential industrial reactors for flash ironmaking based on the computational fluid dynamics technique is described. Overall, this simulation work has shown that the size of the reactor used in the novel flash ironmaking technology (FIT) can be quite reasonable vis-à-vis the blast furnaces. A flash reactor of 12 m diameter and 35 m height with a single burner operating at atmospheric pressure would produce 1.0 million tons of iron per year. The height can be further reduced by either using multiple burners, preheating the feed gas, or both. The computational fluid dynamics (CFD)-based design of potential industrial reactors for flash ironmaking pointed to a number of features that should be incorporated. The flow field should be designed in such a way that a larger portion of the reactor is used for the reduction reaction but at the same time excessive collision of particles with the wall must be avoided. Further, a large diameter-to-height ratio that still allows a high reduction degree should be used from the viewpoint of decreased heat loss. This may require the incorporation of multiple burners and solid feeding ports.

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