DETERMINATION OF DRAG AND LIFT RELATED COEFFICIENTS OF AN AUV USING COMPUTATIONAL AND EXPERIMENTAL FLUID DYNAMICS METHODS

Determination of hydrodynamic coefficients is a vital part of predicting the dynamic behavior of an Autonomous Underwater Vehicle (AUV). The aim of the present study was to determine the drag and lift related hydrodynamic coefficients of a research AUV, using Computational and Experimental Fluid Dynamics methods. Experimental tests were carried out at AUV speed of 1.5 m s-1 for two general cases: I. AUV without control surfaces (Hull) at various angles of attack in order to calculate Hull related hydrodynamic coefficients and II. AUV with control surfaces at zero angle of attack but in different stern angles to calculate hydrodynamic coefficients related to control surfaces. All the experiments carried out in a towing tank were also simulated by a commercial computational fluid dynamics (CFD) code. The hydrodynamic coefficients obtained from the numerical simulations were in close agreement with those obtained from the experiments.

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Determination of Drag and Lift Related Coefficients of an AUV Using Computational and Experimental Fluid Dynamics Methods

10.3940/rina.ijme.2020.a2.600 ◽

2020 ◽

Vol 162 (A2) ◽

Author(s):

E Javanmard ◽

Sh Mansoorzadeh ◽

A Pishevar ◽

J A Mehr

Keyword(s):

Fluid Dynamics ◽

Autonomous Underwater Vehicle ◽

Experimental Tests ◽

Hydrodynamic Coefficients ◽

Experimental Fluid Dynamics ◽

Computational Fluid Dynamics Cfd ◽

Drag And Lift ◽

Control Surfaces ◽

Experimental Fluid

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An investigation of free surface effects on drag and lift coefficients of an autonomous underwater vehicle (AUV) using computational and experimental fluid dynamics methods

Journal of Fluids and Structures ◽

10.1016/j.jfluidstructs.2014.09.001 ◽

2014 ◽

Vol 51 ◽

pp. 161-171 ◽

Cited By ~ 34

Author(s):

Sh. Mansoorzadeh ◽

E. Javanmard

Keyword(s):

Fluid Dynamics ◽

Free Surface ◽

Autonomous Underwater Vehicle ◽

Surface Effects ◽

Underwater Vehicle ◽

Experimental Fluid Dynamics ◽

Drag And Lift Coefficients ◽

Drag And Lift ◽

Experimental Fluid

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Synergistic integration of computational fluid dynamics and experimental fluid dynamics for ground effect aerodynamics studies

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

10.1177/0954410011414321 ◽

2012 ◽

Vol 226 (6) ◽

pp. 602-619 ◽

Cited By ~ 7

Author(s):

T J Barber ◽

G Doig ◽

C Beves ◽

I Watson ◽

S Diasinos

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Ground Effect ◽

Large Datasets ◽

Data Types ◽

Complementary Information ◽

Experimental Fluid Dynamics ◽

Computational Fluid Dynamics Cfd ◽

Disparate Data ◽

Experimental Fluid

This article highlights the ‘synergistic’ use of experimental fluid dynamics (EFD) and computational fluid dynamics (CFD), where the two sets of simulations are performed concurrently and by the same researcher. In particular, examples from the area of ground effect aerodynamics are discussed, where the major facility used was also designed through a combination of CFD and EFD. Three examples are than outlined, to demonstrate the insight that can be obtained from the integration of CFD and EFD studies. The case studies are the study of dimple flow (to enhance aerodynamic performance), the analysis of a Formula-style front wing and wheel, and the study of compressible flow ground effect aerodynamics. In many instances, CFD has been used to not only provide complementary information to an experimental study, but to design the experiments. Laser-based, non-intrusive experimental techniques were used to provide an excellent complement to CFD. The large datasets found from both experimental and numerical simulations have required a new methodology to correlate the information; a new post-processing method has been developed, making use of the kriging and co-kriging estimators, to develop correlations between the often disparate data types.

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Using Experimental Fluid Dynamics and Computational Fluid Dynamics for Evaluating Periodic Mixing

Volume 7: Fluids Engineering ◽

10.1115/imece2018-88531 ◽

2018 ◽

Author(s):

Judith Ann Bamberger ◽

Leonard F. Pease ◽

Kurtis P. Recknagle ◽

Carl W. Enderlin ◽

Michael J. Minette

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

System Performance ◽

Experimental Investigations ◽

Cfd Simulations ◽

Mixing Processes ◽

Experimental Fluid Dynamics ◽

Computational Fluid Dynamics Cfd ◽

Experimental Fluid ◽

Pulse Jet

Periodic mixing using pulse jet mixers is being developed and applied for processing unique slurries of radioactive waste that depending upon the slurry properties may possess either Newtonian or non-Newtonian characteristics. To investigate the performance of these mixing systems, scaled experimental fluid dynamics (EFD) experiments have been conducted and in addition, for certain investigations, computational fluid dynamics (CFD) simulations have been applied. The purpose of this paper is to describe the periodic mixing processes, elaborate regarding the types of scaled experiments that were conducted, and present examples of computational investigations conducted to further define the mixing system performance. The experimental investigations showed the ability to track visual metrics such as cloud height and cavern size. The computational investigations demonstrated the ability to model full-scale experiments with Newtonian slurries.

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Nuclear Steam Dryers Optimized by Computational and Experimental Fluid Dynamics

12th International Conference on Nuclear Engineering, Volume 2 ◽

10.1115/icone12-49457 ◽

2004 ◽

Author(s):

Dani Fadda ◽

David Taylor ◽

Ingemar Greis ◽

Hans Kornfeldt ◽

Heikki Sjo¨vall

Keyword(s):

Fluid Dynamics ◽

Plant Performance ◽

Moisture Removal ◽

Cfd Analysis ◽

Experimental Fluid Dynamics ◽

The Past ◽

Analysis Tools ◽

Computational Fluid Dynamics Cfd ◽

Experimental Fluid ◽

Plant Efficiency

Secondary separators (steam dryers) are used in boiling water reactor vessels as the final stage of moisture removal to provide the highest possible quality steam. Over the past decades many distinct designs were successfully created and put into service. New computational fluid dynamics (CFD) analysis tools and advanced test facilities have been utilized to design higher capacity dryers. These tools have also been utilized for upgrading existing steam dryers and designing new compact dryers, resulting in improved plant efficiency, and better control of radioactivity within the steam loop. Such upgrades are especially attractive to nuclear plant operators and utilities in their evaluation of plant performance, power uprates, and to justify re-licensing efforts. A recent study pertaining to a steam dryer upgrade is discussed for two identical BWRs. The challenges, the analysis tools and considerations from the operator’s perspective are highlighted.

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