Energy Saving Device Evaluation in Full Scale Using Computational Fluid Dynamics

As turbine manufacturers strive to develop machines that are more efficient, one area of focus has been the control of secondary flows. To a large extent these methods have been developed through the use of computational fluid dynamics and detailed measurements in linear and annular cascades and proven in full scale engine tests. This study utilises 5-hole probe measurements in a low speed, model turbine in conjunction with computational fluid dynamics to gain a more detailed understanding of the influence of a generic endwall design on the structure of secondary flows within the rotor. This work is aimed at understanding the influence of such endwalls on the structure of secondary flows in the presence of inlet skew, unsteadiness and rotational forces. Results indicate a 0.4% improvement in rotor efficiency as a result of the application of the generic non-axisymmetric endwall contouring. CFD results indicate a clear weakening of the cross passage pressure gradient, but there are also indications that custom endwalls could further improve the gains. Evidence of the influence of endwall contouring on tip clearance flows is also presented.

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Numerical optimization of membrane module design and operation for a full-scale submerged MBR by computational fluid dynamics

Bioresource Technology ◽

10.1016/j.biortech.2018.08.089 ◽

2018 ◽

Vol 269 ◽

pp. 300-308 ◽

Cited By ~ 7

Author(s):

Mengmeng Liu ◽

Min Yang ◽

Meixue Chen ◽

Dawei Yu ◽

Jiaxi Zheng ◽

...

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Numerical Optimization ◽

Full Scale ◽

Membrane Module ◽

Module Design

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Numerical simulation of the airflow over a military aircraft with active intake

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1177/0954410016651294 ◽

2016 ◽

Vol 231 (8) ◽

pp. 1369-1390 ◽

Cited By ~ 1

Author(s):

T Triantafyllou ◽

T Nikolaidis ◽

M Diakostefanis ◽

P Pilidis

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Computational Fluid Dynamics ◽

Wind Tunnel ◽

Research Effort ◽

Full Scale ◽

Interface Plane ◽

Military Aircraft ◽

Basic Tool ◽

The Way

The aim of the study presented herein is to numerically predict the behaviour of the airflow around a flying military aircraft with an active intake in which the airflow may enter and travel all the way up to the aerodynamic interface plane (the analytical interface between the inlet and engine). Computational fluid dynamics is used as the basic tool. The geometry created consists of a full-scale military aircraft exposed to different flight conditions. The flow results are mainly focused at the aerodynamic interface plane since the present study is a part of a greater research effort to estimate how the airflow distortion induced to the engine’s face due to the aircraft’s flight attitude, affects the embedded gas turbine’s performance. The obtained results were validated through a direct comparison against similar experimental ones, collected from a wind tunnel environment.

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A Computational Fluid Dynamics Based Integrated Disinfection Design Approach for Improvement of Full-scale Ozone Contactor Performance

Ozone Science and Engineering ◽

10.1080/01919510701613420 ◽

2007 ◽

Vol 29 (6) ◽

pp. 451-460 ◽

Cited By ~ 16

Author(s):

Jianping Zhang ◽

Peter M. Huck ◽

William B. Anderson ◽

Gordon D. Stubley

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Full Scale ◽

Design Approach ◽

Ozone Contactor

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Escort Tug Performance Prediction Using Computational Fluid Dynamics

Journal of Ship Research ◽

10.5957/jsr.2016.60.2.61 ◽

2016 ◽

Vol 60 (02) ◽

pp. 61-77

Author(s):

Brendan Smoker ◽

Bart Stockdill ◽

Peter Oshkai

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Flow Separation ◽

Travel Speed ◽

Hydrodynamic Forces ◽

Full Scale ◽

Computational Fluid Dynamics Cfd ◽

Cfd Method ◽

Thrust Forces ◽

Steering Force

In this paper, we outline and validate a computational fluid dynamics (CFD) method for determining the hydrodynamic forces of an escort tug in indirect towing mode. We consider a range of yaw angles from 0° to 90° and a travel speed of 8 knots. We discuss the effects of scaling on prediction of flow separation and hydrodynamic forces acting on the vessel by carrying out CFD studies on both model and full-scale escort tugs performing indirect escort maneuvers. As the escort performance in terms of maximum steering forces is strongly dependent on the onset of flow separation from the hull and skeg of the tug, the model-scale simulations under-predict the maximum steering force by 12% relative to the full-scale simulations. In addition, we provide a method for converting the hydrodynamic forces of the CFD escort study into towline and thrust forces.

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Hydrodynamic evaluation of a full-scale facultative pond by computational fluid dynamics (CFD) and field measurements

Water Science & Technology ◽

10.2166/wst.2014.265 ◽

2014 ◽

Vol 70 (3) ◽

pp. 569-575 ◽

Cited By ~ 11

Author(s):

Ricardo Gomes Passos ◽

Marcos von Sperling ◽

Thiago Bressani Ribeiro

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Short Circuit ◽

Field Measurements ◽

Tracer Test ◽

Full Scale ◽

Cfd Model ◽

Cfd Modelling ◽

Hydraulic Behaviour ◽

Computational Fluid Dynamics Cfd

Knowledge of the hydraulic behaviour is very important in the characterization of a stabilization pond, since pond hydrodynamics plays a fundamental role in treatment efficiency. An advanced hydrodynamics characterization may be achieved by carrying out measurements with tracers, dyes and drogues or using mathematical simulation employing computational fluid dynamics (CFD). The current study involved experimental determinations and mathematical simulations of a full-scale facultative pond in Brazil. A 3D CFD model showed major flow lines, degree of dispersion, dead zones and short circuit regions in the pond. Drogue tracking, wind measurements and dye dispersion were also used in order to obtain information about the actual flow in the pond and as a means of assessing the performance of the CFD model. The drogue, designed and built as part of this research, and which included a geographical positioning system (GPS), presented very satisfactory results. The CFD modelling has proven to be very useful in the evaluation of the hydrodynamic conditions of the facultative pond. A virtual tracer test allowed an estimation of the real mean hydraulic retention time and mixing conditions in the pond. The computational model in CFD corresponded well to what was verified in the field.

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Optimization of membrane unit location in a full-scale membrane bioreactor using computational fluid dynamics

Bioresource Technology ◽

10.1016/j.biortech.2017.09.209 ◽

2018 ◽

Vol 249 ◽

pp. 402-409 ◽

Cited By ~ 12

Author(s):

Qing Wu ◽

Xiaoxu Yan ◽

Kang Xiao ◽

Jing Guan ◽

Tianyu Li ◽

...

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Membrane Bioreactor ◽

Full Scale ◽

Membrane Unit

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VIV Prediction of a Truss Spar Pull-Tube Array Using CFD

Volume 7: CFD and VIV; Offshore Geotechnics ◽

10.1115/omae2011-50145 ◽

2011 ◽

Cited By ~ 1

Author(s):

Yiannis Constantinides ◽

Weiwei Yu ◽

Samuel Holmes

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Structural Model ◽

Full Scale ◽

Complex Flows ◽

Single Cylinder ◽

Structure Interaction ◽

Cylinder Arrays ◽

Truss Spar ◽

Computational Fluid Dynamics Cfd

Complex flows through cylinder arrays, such as the case of pull-tubes located in the truss section of a truss spar, are very difficult to describe and analyze. It is especially difficult to predict and correct Vortex Induced Vibration (VIV) response using traditional tools that were developed to analyze single cylinder rather than arrays of cylinders. Computational Fluid Dynamics (CFD) offers the designer the ability to properly analyze these complex problems and increase the reliability of his design. In this study, a full scale truss spar with pull-tubes is modeled using CFD coupled with an FEA structural model of the pull-tubes for a fluid-structure interaction (FSI) computation. The VIV response of the pull-tubes is predicted and analyzed for different current headings and speeds.

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