October 26, 2020 at 10:06 pmvkr535SubscriberOctober 27, 2020 at 10:35 pmKaiAnsys EmployeeHi, below is some old comments related to this problem.nA negative film coefficient (heat transfer coefficient) is usually considered non-physical since it would imply that if the bulk temperature is hotter than the surface temperature, heat would be removed rather than added to the system.nThat being said, however, a negative film coefficient can be defined by using the material property HF lookup table. With the SF family of commands, specify a value of -N, where N is the material ID of MP,HF. Then, one can define constant or temperature-dependent film coefficients with values in MP,HF (see also MPTEMP and MPDATA commands).nSince a negative value for film coefficient in the SF family of commands refers to the material ID of a lookup table in MP,HF, a user cannot specify negative film coefficients directly. Also, tabular loads cannot be used, either, as evaluated negative values are also assumed to be pointing to the MP,HF material ID number.nOctober 27, 2020 at 10:45 pmvkr535SubscriberHello Team,nThank you for the response. I checked giving negative values to HF in MP command and its working now and clean.Viewing 2 reply threads
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