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[FAQ]

It represents thermal conduction through the contact.
q=TCC(Tc-Tt)
Theoretically, TCC=infinity would represent perfect contact. Thus, Tc=Tt for TCC=infinity. However if user defines too large a TCC value, it will create numerical instability issues. So the default calculation is an attempt to come up with a large enough value for TCC to simulate “perfect” thermal contact without causing numerical instability. Partial thermal contact can be achieved by throttling TCC down to a small value. As TCC gets smaller, the Delta Temp between contact and target surfaces should increase. As TCC approaches zero, q=zero and the interfaces approaches a perfectly insulated condition with no heat transfer.