I noticed flow simulation provided heat sink in the engineering database. I can see we can specify thermal resistance and pressure drop data in the heat sink component.

My question is how different are there between using the heat sink component in the engineering database and make a model a detail CAD of the real heat sink? For instance, how much computer time can I save with using the component in the database and how accurate it is comparing to a read CAD model?

Thanks and I hope I made myself clear.