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Transient conduction can create large data files since by default, ANSYS stores temperature values at all nodes at each time step. This can result in large data files if you have a lot of nodes and/or time steps. It is advisable to save at equally spaced time intervals by selecting the option below. Adjust the value to get reasonable sized data files.

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When This is unavoidable while working on the project; so make sure you have several GB of diskspace available. But when saving your project after you are done, you can create a small project file using the trick shown in the following video. Also, the solve times could be long (more than 20 minutes for this problem) if you have a lot of nodes and/or time steps. This is because a stiffness matrix inversion is involved at each time step. In contrast, in the steady case, there is only one stiffness matrix inversion for a linear problem, which is what we have here. 

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