A new phenomenon in interference effect on catamaran dynamic response

Honaryar, Amir; Ghiasi, Mahmoud; Liu, Pengfei

doi:10.1016/j.ijmecsci.2020.106041

Cited by 8 publications

(5 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The functionality of the ST40M engine was tested for the entire operating domain by using the same fuel system, lubrication installations, control systems, and instrumentation designed for operation on the ship. A short description of the process can be found in [25], where the results obtained for the intake manifold are presented.…”

Section: Experimental Methodologymentioning

confidence: 99%

Experimental Validation of a Multi-Purpose Exhaust System Designed for a Naval Propulsion Group

Dumitrescu

Drãgan

Gherman

et al. 2023

JMSE

View full text Add to dashboard Cite

This paper describes the effort of designing an unconventional exhaust manifold for a marine gas turbine engine, with an integrated passive ventilation port for cooling the engine housing. The study is part of a larger program to substitute the propulsion gas turbines for the T22R defense frigate and make the proper aerodynamic adaptations. The system in question is unique, in the sense that it uses the exhaust gas momentum to entrain outside air and ventilate the engine enclosure. In achieving this, RANS computation was used to test various concepts and dimensions for the ventilation system. Based on these analyses, the design that provided adequate air circulation with minimum pressure losses was chosen and the parts were integrated in the overall assembly. The experimental campaign performed on the entire aero-package showed good synergies of the ventilation system with the other adaptations and the engine itself. Performance was evaluated with pressure and temperature probes distributed around the aero-package and were found to be within 3.5% of the data predicted by CFD. This brings further studies closer to a technology readiness level vital for insitu testing on board the ship itself.

show abstract

Section: Experimental Methodologymentioning

confidence: 99%

Experimental Validation of a Multi-Purpose Exhaust System Designed for a Naval Propulsion Group

Dumitrescu

Drãgan

Gherman

et al. 2023

JMSE

View full text Add to dashboard Cite

show abstract

“…Lately, Computational Fluid Dynamics (CFD) has imposed itself as a very valuable tool for many numerical studies related to the investigation of the total resistance of a catamaran and the interference phenomenon. [12][13][14][15][16][17][18][19][20] The combination of experimental and computational fluid dynamics currently represents the best practice for the investigation of catamaran hydrodynamics. 21 The influence of a bulbous bow on the total resistance of a yacht was investigated using both towing tank tests and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of interference effects for the Delft 372 catamaran

Farkas,

Degiuli,

Tomljenović

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

Due to interference effects, the resistance of a catamaran is not the same as the double resistance of the monohull. If demihulls are close enough to each other, the wave fields generated by each demihull usually significantly interfere causing either advantageous or disadvantageous effects. In this paper, the numerical investigation of interference effects for the Delft 372 catamaran is performed. The verification and validation studies are performed demonstrating the potential of the proposed numerical model for the analysis of interference effects. The investigation of the effect of Froude number and demihull separation on the total resistance of a catamaran, trim angle, and sinkage is conducted. The interference effects are quantified through the interference factor, which is defined based on the total resistance of a catamaran and double the total resistance of the monohull. Finally, the flow field characteristics, wave patterns, and pressure distributions are analysed using Computational Fluid Dynamics.

show abstract

“…In recent years, multi-hulls have been widely studied by a large number of researchers because of their wide deck area, excellent speed, and seakeeping performance. The catamaran is one of the most widely studied and applied hull forms, with relatively variable designs, including the small waterline catamaran (SWATH), wave-piercing catamaran, partial air cushion support catamaran (PACSCAT) [1][2], asymmetric catamaran [3][4][5], supercritical catamaran [6], etc. Trimarans and pentamarans mostly use the form of a large main hull in the middle and small demihulls distributed on both sides of the main hull, while the hull forms are mostly slender or small waterline hulls.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Resistance Characteristics of a Novel High-Speed Quadramaran

Liu

Yang

et al. 2023

Polish Maritime Research

View full text Add to dashboard Cite

This paper utilised computational fluid dynamics (CFD) technology to calculate the resistance of a novel high-speed quadramaran in calm water using the Navier‒Stokes (N‒S) equation, analysed the total resistance, frictional resistance, and residual resistance characteristics of this novel high-speed quadramaran at different length Froude numbers, and compared them with the results of a conventional high-speed catamaran with the same displacement. The results showed that the total resistance of the quadramaran had a significant hump at the Froude number of 0.6, due to the complexity of the wave interference among the four demihulls, and the hump value was about 1.6 times that of the catamaran. Above the hump speed, the total resistance of the quadramaran decreased with the increase of the Froude number, until reaching the Froude number of 1.06, when the curve became flat, and it showed a maximum resistance reduction of 40% at the Froude number of 1.66 compared with the catamaran, where the total resistance curve was steep. The frictional resistance of the quadramaran increased gradually with the growth of the Froude number, which was basically consistent with the change trend of the catamaran. The residual resistance of the quadramaran first rose and then reduced with the rising Froude number, the curve showed a large hump due to the adverse wave interference, and the hump value was about 1.7 times that of the catamaran. Above the Froude number of 1.06, as the wave interference changed from adverse to favourable, the quadramaran had lower residual resistance than the catamaran. The bow and stern demihulls of the quadramaran were also analysed for their resistance characteristics. The total resistance of the bow demihulls increased gradually with the increase of the Froude number, the curve had a small hump at the Froude number of 0.7, and above the hump speed, the curve was steep. The total resistance of the stern demihulls first increased and then decreased with the growth of the Froude number, the hump value at the Froude number of 0.85 was significant and was about 2 times that of the bow demihulls, and the curve became flat above the Froude number of 1.51.

show abstract

A new phenomenon in interference effect on catamaran dynamic response

Cited by 8 publications

References 86 publications

Experimental Validation of a Multi-Purpose Exhaust System Designed for a Naval Propulsion Group

Experimental Validation of a Multi-Purpose Exhaust System Designed for a Naval Propulsion Group

Numerical investigation of interference effects for the Delft 372 catamaran

Numerical Analysis of Resistance Characteristics of a Novel High-Speed Quadramaran

Contact Info

Product

Resources

About