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Numerical data visualisation method

In this method, a flow field is numerically analysed by computer, and its 22 Nakayama, Y. et ai., Report of Research Results (5th), Faculty of Engineering, Tokai University (1987), 1. 288 Flow visualisation enormous computational output is presented in an easy-to-understand figure or image by computer graphics techniques. The kinds of presentation include: contours, where physically equal values are connected by a curve; area colouring, where areas are painted in colours respectively corresponding to the physical quantity level of areas; isosurface, where physically equal values are three-dimensionally manifested in surfaces; volume rendering, where the levels expressed in isosurfaces are manifested by changing the degree of transparency; and vectorial, where sizes and directions of flow velocity etc. are manifested by arrow marks. Presentation can also be as graphs or animation. Examples of contour presentation are Fig. 15.4, where streamlines (which are the contours of stream function) and contours of vorticity are manifested, Fig. 15.10, where contours of density are shown, and Plate 5 where the presentation is made three-dimensionally. Examples of area colouring are Plates l(a) and 2, where the pressure distribution is shown, and Plate 6(a) where the presentation is threedimensional. And an example of isosurface presentation is shown in Plate 13,23 and those of the vector presentation in Fig. 15.25(b), Fig. 15.26(b), Plate l(b) and Plate 3.