DrAmine
Ansys Employee

First of all you need to use an official Ansys website and not a help hosted on another third-party website. WFGC is required for polyhedral cells. HOTR might improve stability and Frozen Flux might do the same. So all are numerical recipies to make runs more stable but not more accurate. As it is with numerical recipies they are are meds for every situation. Moreover we are enabling and disabling them the same time: you should do it once per time. But if the "virigin" setup is running and providing good convergence trends by terms of Residual, Imbalances and Monitoring: I won't change anything in the default setup!