Directly coupled fluid structural model of a ship rudder behind a propeller

A computational method is presented that models fluid structural interaction problems for three-dimensional marine structures. Flow can be modelled with either potential or viscous incompressible flow. The structure deformation is modelled by a shell finite element formulation. The two fields are coupled by a domain decomposition approach that uses virtual surfaces to transfer information. A typical spade rudder has been modelled for steady-state three-dimensional problems in a free stream and in way of a propeller race. These computational models have been tested for mesh dependancy in both the fluid and structural domains as well as the virtual surface definition. The results show increased correlation to experimental data from uncoupled hydrodynamic modelling as well as detailed structural deformation. Of note is the variation in rudder stock bending moment from that utilised by classification society scantling rules.

[1]  J. Hess.  Panel Methods in Computational Fluid Dynamics , 1990 .

[2]  Guru P. Guruswamy,et al.  Wing-body aeroelasticity on parallel computers , 1996 .

[3]  Stephen R. Turnock.  Prediction of ship rudder-propeller interaction using parallel computations and wind tunnel measurements , 1993 .

[4]  J. Anderson,et al.  Computational fluid dynamics : the basics with applications , 1995 .

[5]  G. Guruswamy.  Unsteady aerodynamic and aeroelastic calculations for wings using Euler equations , 1990 .

[6]  Stephen R. Turnock.  Technical manual and user guide for the surface panel code: PALISUPAN , 1997 .

[7]  C. Hirsch,et al.  Numerical Computation of Internal and External Flows. By C. HIRSCH. Wiley. Vol. 1, Fundamentals of Numerical Discretization. 1988. 515 pp. £60. Vol. 2, Computational Methods for Inviscid and Viscous Flows. 1990, 691 pp. £65. , 1991, Journal of Fluid Mechanics.

[8]  W. G. Price,et al.  Hydroelasticity of Ships , 1980 .

[9]  Anthony F. Molland,et al.  WIND TUNNEL INVESTIGATION OF THE INFLUENCE OF PROPELLER LOADING ON SHIP RUDDER PERFORMANCE , 1992 .

[10]  Stephen R. Turnock,et al.  Wind tunnel tests on the influence of propeller loading on ship rudder performance: four quadrant operation, low and zero speed operation , 1993 .

[11]  Thomas E. Noll,et al.  Active Flexible Wing Program , 1995 .

[12]  Owen F. Hughes,et al.  Ship Structural Design: A Rationally-based, Computer-aided, Optimization Approach , 1983 .

[13]  Guru P. Guruswamy,et al.  Fluid-structural interactions using Navier-Stokes flow equations coupled with shell finite element structures , 1993 .

[14]  Joel H. Ferziger,et al.  Computational methods for fluid dynamics , 1996 .