In 3D steady state, with insulation under the slab, what augmentation at the corner is needed to restore it to the same temperature as in step 2?
Any suggestions you’d like to share will be welcome. A. Perhaps chapter 11 A few tips in the HEAT2 manual may help you. Most of it applies to 3D cases as well. You should try to use a fast computer with a modern Pentium or a Athlon CPU. Using larger numerical cells will increase the time-step but also increase the numerical error. When I have problems of this kind with frost heave, I usually start from the steady-state temperature (with the average outdoor mean value) and then continue with transient calculations with a sinusoidal maybe 3-5 years until more or less the same variation is reached. After that I apply a sudden cold-spell (e.g. -18 degC) for 1 or 2 weeks and look at the isotherms under or near the house. A rule of Swedish thumb is that the zero degree isotherm must not reach below/under a 45 degree line that goes under and out from the side of the house. However if the soil is not sensible for frost heave the zero isotherm may go beneath the house. The corner (3D) is normal
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