Reply To: Thermal analysis using convection surface APDL21

[Mike Rife]

MAPDL takes a negative value of convection coefficient (HF) to be HF is a function of temperature based on the MP command defining HF.  In this case it is possible for the HF expression to return negative values; not sure if you meant that or not.  In any case that element has a negative HF applied so it is looking for a temperature dependent HF defined via MP.  To change the behavior use SCOPT which has a option to force the use of a negative HF.  See the public help on the command for its options: https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v242/en/ans_cmd/Hlp_C_SCOPT.html