I want to develop a transient thermal model for a moving heat source in ANSYS using APDL. I have not been getting a nodal solution for temperature distribution any time I selected heat flux as my thermal source. Not only that, but I suspected the problem to be here: For example. Any time I keyed a command: main menu>preprocessor>loads>define loads>apply>thermal>heat flow>on nodes/elements, I will be prompted with a default window to select a DOF. There, I always select temperature as a DOF. The same thing happened if I select: define loads>apply>thermal>temperature>on nodes or else. But whenever I selected: the main menu>preprocessor>loads>define loads>apply>thermal>heat flux>on nodes/elements, the pop-up window for DOF selection will never be. Can anyone help me?