Explain the observed distribution of surface pressure.
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Answer:
The surface pressure distribution for a cube is compared in Fig. 5[8]. The most important position to be noted is the frontal corner where the largest negative value appears. The result of k−ε deviates greatly at this area. The large negative peak just at the corner decreases rapidly in a distribution peculiar to k−ε. We often get such inaccurate pressure distribution when k−ε is applied to a bluff body. This is caused by the failure to reproduce the small separation here, as is shown in Fig.6, where the area around the frontal corner is magnified. We can observe a small separation in the results of the experiment, ASM and LES, but not in the result of k−ε. It should be noted again that the conditions of the numerics including boundary conditions are made as identical as possible for the simulations of all three turbulence models (cf. Note 2).
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