Hot Spot plotting is a function in SOLIDCast that locates thermal centers or hot spots within the casting by comparing solidification times or critical fraction solid times of points within local areas. The range of values is always 0 to 10, and generally the value plotted is around 1.1 or 1.2 (a value of 1.0 indicates an area of “stagnant” solidification). You can plot Hot Spots based either on Solidification Time or based on Critical Fraction Solid Time.
To figure hot spot values, the system compares either the solidification time, or the critical fraction solid (CFS) time of each metal node to its neighbors. If it froze later than its neighbors, it is an isolated area, or a hot spot. The system keeps track of the differences in time, then orders them from the greatest isolation on down. All isolated areas are normalized to the range of 0-1, where 0 is most isolated, and 1 is stagnant, that is, froze at the same time as neighbors. Non-isolated areas are ordered, then normalized to the range of 1-10, where 1 is stagnant and 10 is most directional.
By plotting at a level of 1, you can see actual isolation locations. If you plot at 1.1 or 1.2, you may be able to see these locations more clearly, since they will cover a greater volume.
The hot spot plot does not give an indication of the severity of the defect, as it does not take contraction/expansion into account. But it does give a good indication of what areas may have problems.