Optimization and Computational Fluid Dynamics - Department of ...

254 Marco Manzan, Enrico Nobile, Stefano Pieri and Francesco Pinto
10
8
f/f
0 6
4
2
1 1.1 1.2 1.3 1.4 1.5 1.6 1.7
Nu/Nu
0
Fig. 8.16 Two distinct Pareto front for the different type of geometries
10
8
f/f
0 6
4
2
1 1.1 1.2 1.3 1.4 1.5 1.6 1.7
Nu/Nu
0
Fig. 8.17 Overlapping the solutions, leading to a single Pareto front
dominance applied to both subsets of design shows there are clearly two
fronts made of completely different geometries that overlap. From Fig. 8.17,
it is clear that the unfiltered front is mainly made by long geometries with
superpositions of short channels. Figure 8.14 shows two examples of this
phenomenon. It should be noted that at low values of f and Nu, the shape
of designs is close to parallel plate channel, so the different length does not
affect the form of the wave.
The six channels marked in Fig. 8.14 are shown in Fig. 8.18, together with
the streamlines and non-dimensional temperature field. They are scaled with
the same average height in order to be directly compared. In Table 8.5, the