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The journal International Shipbuilding Progress (ISP) was founded in 1954. Each year four issues appear (in April, July, September and December). Publications submitted to ISP should describe scientific work of high international standards, advancing subjects related to the field of Marine Technology, such as:
The contents may be of a pure scientific or of an applied scientific nature.
Article Type: Research Article
Abstract: A wind tunnel simulation of two boundary layer flows (with and without an adverse pressure gradient) on two surfaces with different roughness was carried out. One of the surfaces was covered throughout with an irregular coarse roughness and the other was identical but additionally overlaid with a large number of deformable nylon on tufts (to simulate the growth of biological fouling on a marine object). Detailed mean flow and turbulence measurements were carried out to perceive the effect of the overlayer on the boundary layer development with different pressure gradient conditions. Generally, the overlayer affected significantly a majority of …the monitored quantities, i.e., the physical growth, displacement, momemtum loss, wall friction, normal and shear turbulent stresses, mixing length, eddy viscosity, etc. However, with the pressure gradient (of nearly constant second derivative) the effect on the physical growth and the displacement thickness parameters was somewhat reduced. The latter flow resulted in a near equilibrium boundary layer at the rear of the test plate. Macro- and micro-scales of turbulence were hardly affected by the overlayer, but the dissipation length was reduced by it. A lag-entrainment method (modified here for the particular surface roughnesses) predicted the present experimental data well. Another family of integral methods did worse. Show more
Citation: International Shipbuilding Progress, vol. 33, no. 386, pp. 174-186, 1986
Article Type: Research Article
Abstract: Recent developments in computing technology and reduced hardware costs have encouraged the use of micro-based CAD workstations. The need for effective design procedures which utilize the attributes of such workstations is recognised. A system for generating a hull form of sufficient accuracy and fairness for use in preliminary design is described. The surface is defined using a set of bi-cubic B-spline surface patches although intermediate forms can be examined via a cubic spline 2-D or 3-D representation. While the mathematical methodology is less sophisticated than that which forms the basis of some of the more advanced systems, fundamental procedures are …adapted and structured in a way that ensures accurate and reliable results. This facilitates the rapid generation of hull forms at relatively low cost. These features provide the designer with a flexible and effective design tool which can be used in an environment where frequent changes may be necessary or a large number of alternative designs have to be examined e.g. at the conceptual or preliminary design stage. An application of the system to the design of a Ro-Ro type form is given. Show more
Citation: International Shipbuilding Progress, vol. 33, no. 386, pp. 187-194, 1986
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