Effect of tunnel on the resistance of high-speed planing craft

Dublin Core

Title

Effect of tunnel on the resistance of high-speed planing craft

Subject

High speed planing craft
Tunnels
Resistance
Extrapolation methods
Pressure distribution
CFD Studies

Description

Tunnels are provided in ship hulls to accommodate propellers under reduced draught conditions, thereby avoiding reduction of propeller diameter and consequent loss of efficiency. In this work the hydrodynamic effect of propeller tunnels in high speed craft, by way of modified resistance and pressure distribution, are studied both numerically using CFD, and experimentally using geometrically scaled models. The experimental study has been conducted on the model of a single hard chine hull form designed for specific length to displacement ratio. The parametric study considers two other draught conditions. In order to bring out pressure influences, CFD based simulations have been carried out. It is noted that the pressure distributions are altered around the tunnel region and, for an investigated case of tunnel area ratio, there is consistent reduction of resistance for all the three draught conditions tested. The study also compares the merits of the modified Froude extrapolation method, after correction for flow velocity due to pressure development in the hull zone, with the classical Savitsky's method for planing hulls. The qualitative aspects with respect to pressure distribution are brought out in the CFD based studies and the pressure predictions do show consistency with obtained experimental data. Keywords: High speed planing craft, Tunnels, Resistance, Extrapolation methods, Pressure distribution, CFD Studies. doi: 10.3329/jname.v2i1.2025 Journal of Naval Architecture and Marine Engineering 2(1)(2005) 1-14

Creator

Subramanian, V Anantha
Subramanyam, PVV

Source

Journal of Naval Architecture and Marine Engineering; Vol. 2 No. 1 (2005); 1-14
2070-8998
1813-8535

Publisher

Association of Naval Architects and Marine Engineers

Date

2009-02-10

Relation

Format

application/pdf

Language

eng

Type

info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

Identifier

Citation

V Subramanian Anantha and PVV Subramanyam, Effect of tunnel on the resistance of high-speed planing craft, Association of Naval Architects and Marine Engineers, 2009, accessed November 22, 2024, https://igi.indrastra.com/items/show/3162

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