Geometric modelling of bulbous bows with the use of non-uniform rational B-spline surfaces |
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Authors: | Francisco Pérez José A Suárez Juan A Clemente Antonio Souto |
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Institution: | (1) Naval Architecture School of Madrid (ETSIN), Universidad Politecnica de Madrid (UPM), Avda. Arco de la Victoria, SN., 28040 Madrid, Spain;(2) NAVANTIA Astillero San Fernando-Puerto Real, Cádiz, Spain |
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Abstract: | Nowadays, bulbous bow forms have become a common design feature in most conventional ship designs. The design of a bulbous
bow is usually attempted with the use of certain form parameters that are imposed using the designer's experience or regression
values that provide the optimum parameters based on experimental tests or computational fluid dynamics (CFD) calculations.
In this article, the geometric modelling of a bulbous bow form that complies with a series of parameters is presented. First,
a wire model was constructed with cubic B-spline curves that hold certain form parameters that the designer wants to impose.
Second, a B-spline surface that fits these splines was mathematically constructed. A review of the influence of the design
parameters used on the bulbous bow properties was made. This method could be used prior to numerical optimization of a bulbous
bow because different variations of the design can be easily generated. These variations can be tested numerically using CFD
software. A practical application example of the method is shown. |
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Keywords: | Bulbous bow NURBS B-splines Ship design Hull form expression |
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