When the calculations are finished, the message Process '…', started on … has finished. are displayed. Then we can proceed to visualising the results by pressing Postprocess (therefore the problem must still be loaded; should this not be the case we first have to open the problem files again).
As the postprocessing options to be used are the same as in the previous example, they will not be described in detail here again.
The results
given below correspond to the last
Figure 74 Velocity module distribution |
Figure 75 Velocity contour lines |
Figure 76 Velocity vectors, detail |
Figure 77 Pressure distribution |
Figure 78 k (eddy energy) level contours |
Figure 79e level contours |
Figure 80 Eddy viscosity level contours |
We can verify the numerical results by comparing them with experimental and other numerical results. More specifically the length of the vortex developed down stream of the step can be compared to experiments that give a value of (7.0 ± 1.0) H for the length of the vortex [12]. This length can be measured by using the border graph facilities of GiD. If we draw a border graph of the velocity X component of the bottom contour of Set 4 we will obtain the result shown in Figure 66.
Figure 81 Horizontal velocity along the bottom contour |
From Figure 81 a vortex length of approximately 8.0 H is measured (distance between the two points with null X velocity component) which is a reasonably good result for the coarse mesh used.
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