Comparative assessment of URANS, SAS and DES turbulence modeling in the predictions of massively separated ship airwake characteristics

Shukla, Shrish; Singh, Sadhna; Sinha, Sawan Suman; Vijayakumar, R.

doi:10.1016/j.oceaneng.2021.108954

Cited by 22 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the turbulence intensity ( I ) is calculated by dividing the standard deviation of the respective velocity components (σ u and σ v ) by the freestream velocity ( U ∞ ), as per equations (3)–(5) respectively. 30,41–43…”

Section: Resultsmentioning

confidence: 99%

“…Cheney and Zan 17 and subsequently Zan, 18,19 reported the results of experiments conducted on the prototype. Many research groups from around the world have also adopted and utilized the SFS for research on ship-helicopter interface (Reddy et al, 20 Liu et al, 21 Syms, 22 Roper et al, 23 Forrest et al, 24 Mora, 25 Shukla et al [26][27][28][29][30] ). The comprehensive review of research on the ship-helicopter interface discussed by Shukla et al 27 highlights the impact of the SFS, as a common geometry, in furthering collaborative research in this field.…”

Section: Studies On Ship-helicopter Dynamic Interfacementioning

confidence: 99%

See 1 more Smart Citation

Pressure and velocity measurements of air flow past a proposed generic Aircraft carrier geometry

Kumar

Sheikh

Shukla

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

Research on the air flow disturbances in the aircraft carrier environment has gained prominence in recent times. However, there is presently no representative carrier model analogous to the Simplified Frigate Shape (SFS) which is generic naval frigate for air flow investigation. In the present study, a Generic Aircraft Carrier (GAC) model is proposed, as a simplified, benchmark model for aerodynamic research. With the motivation to provide validation data for future CFD studies, baseline experimental data is generated in the wind tunnel, in terms of pressure distribution over the deck, for two variants, namely, a complete flat deck configuration with no island and secondly, with the island in the baseline position of the GAC. Effect of the island in modifying the flow is discussed by a comparison between the two variants. Particle Image Velocimetry (PIV) is employed to record velocity and turbulence levels in the GAC environment, highlighting regions of velocity deficits, and unsteady flow which may hinder the landing procedure of an approaching pilot. Comprehensive database of experimental data is presented as baseline data for future work and for validation of numerical models. Traditional tuft and smoke visualization studies are also conducted to provide corroboratory qualitative insights.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Studies On Ship-helicopter Dynamic Interfacementioning

confidence: 99%

Pressure and velocity measurements of air flow past a proposed generic Aircraft carrier geometry

Kumar

Sheikh

Shukla

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

show abstract

“…Despite a higher speed value than reported in previous studies, the used material supported the blood-induced viscous stress in the three configurations of the pores. As the size of the pore increased, the decreasing tendencies in all the physical properties showed significant improvements, resulting in permeability enhancement [17][18][19]. It is interesting to observe that the pressure drops as low as 300 µm for PLA, while PEI turns out to be the highest of all.…”

Section: Selection Of the Fsi Calculation Methodsmentioning

confidence: 94%

“…The precision of the k-ε model in the outer zones decreases the weakness of the Wilcox model given the presence of the higher Reynolds values. The model also improves the calculation of the FSS derived from turbulence, as well as the computation of the pressure gradients [17].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Turbulence Methods Applied to the Design of a 3D-Printed Scaffold and the Selection of the Appropriate Numerical Scheme to Simulate the Scaffold for Tissue Engineering

Suffo

López-Marín

2021

Applied Sciences

View full text Add to dashboard Cite

Current commercial software tools implement turbulence models on computational fluid dynamics (CFD) techniques and combine them with fluid-structural interaction (FSI) techniques. There are currently a great variety of turbulence methods that are worth investigating through a comparative study in order to delineate their behavior on scaffolds used in tissue engineering and bone regeneration. Additive manufacturing (AM) offers the opportunity to obtain three-dimensional printed scaffolds (3D scaffolds) that are designed respecting morphologies and that are typically used for the fused deposition model (FDM). These are typically made using biocompatible and biodegradable materials, such as polyetherimide (PEI), ULTEM 1010 biocompatible and polylactic acid (PLA). Starting from our own geometric model, simulations were carried out applying a series of turbulence models which have been proposed due to a variety of properties, such as permeability, speed regime, pressures, depressions and stiffness, that in turn are subject to boundary conditions based on a blood torrent. The obtained results revealed that the detached eddy simulation (DES) model shows better performance for the use of 3D scaffolds in its normal operating regime. Finally, although the results do not present relevant differences between the two materials used in the comparison, the prototypes simulated in PEI ULTEM 1010 do not allow their manufacture in FDM for the required pore size. The printed 3D scaffolds of PLA reveal an elastic behavior and a rigidity that are similar to other prototypes of ceramic composition. Prototypes made of PLA reveal unpredictable variability in pore and layer size which are very similar to cell growth itself and difficult to keep constant.

show abstract

Hydrodynamic Characteristics of an Underwater Manipulator in Pulsating Flow

Liu,

Duan,

Zhang

et al. 2024

J. Marine. Sci. Appl.

View full text Add to dashboard Cite

Comparative assessment of URANS, SAS and DES turbulence modeling in the predictions of massively separated ship airwake characteristics

Cited by 22 publications

References 16 publications

Pressure and velocity measurements of air flow past a proposed generic Aircraft carrier geometry

Pressure and velocity measurements of air flow past a proposed generic Aircraft carrier geometry

A Comparative Study of Turbulence Methods Applied to the Design of a 3D-Printed Scaffold and the Selection of the Appropriate Numerical Scheme to Simulate the Scaffold for Tissue Engineering

Hydrodynamic Characteristics of an Underwater Manipulator in Pulsating Flow

Contact Info

Product

Resources

About