I'm a bit of a novice with SimCFD and was wondering if it is possible to merge edges in the program by selection rather than having the edge merge tool automatically select the edges to merge. Is this possible in CFD or is merging of objects something that should be done in Inventor before importing into CFD?
Great question! The geometry tools are threshold based which means you can't select which ones you want to fix like what you are asking. So, if there is something that you want to fix manually like what you are describing you will want to do that in your CAD tool.
In regards to the edge merge tool. In almost all cases there is no reason not to use the defaults for edge merge. It would be interesting to see why you want to just select a subset.