If you have a molding scenario where certain areas of the mold are known to have higher or lower temperatures, you can simulate this using the Ideal cavity-side mold temperature and Ideal core-side mold temperature. For a Fill+Pack analysis, use this property to simulate a mold that does not have a constant temperature.
Creating an accurate model of not only the part, but the mold used to make the part, is critical to a successful flow simulation. Often, the mold used to make a plastic part consists not only of a cavity hollowed from the mold plates, but also a core (the moving plate), which extends into the overall plane of a part to make a cylinder or depression. Inherently, the use of a core in a mold creates problems with the cooling system. A core area is more difficult to penetrate with cooling channels, bubblers, baffles, and other cooling devices. Because the core is deep within the mold base, it is not only less accessible to the cooling system, but it also has more difficulty in diffusing heat away from the part.
Unbalanced cooling, which is the result of temperature differences between the mold walls, can result in asymmetrical thermal-induced residual stress. This kind of unbalanced cooling results in an asymmetric tension-compression pattern across the part, and consequently a bending moment that tends to cause warpage of the part.
You can set your own cavity-side and core-side temperatures so that the flow simulation can provide you with predictions of warpage. Using the simulation results, you can tailor your process to minimize the temperature difference, and therefore a major cause of warpage, as much as possible.
Generally speaking, only a small portion of a mold is designed to operate under different cavity-side and core-side mold wall temperatures. This feature is provided so you can determine the optimal core-side and cavity-side temperatures for minimum warpage. For all elements in which the cavity-side temperature equals the core-side temperature, you do not need to assign the temperatures separately.