Currently (up to at least Fluent 15), when you attempt to export multiple injections from Fluent to the EnSight format, each injection is written as its own set of Measured Data files **SEPARATELY**, with separate .encas files written.
The result is that if you were to attempt to load any of the separate .encas files into EnSight, you would only see particles from a single injection. You could perhaps load in the multiple .encas files as multiple cases, but this would perhaps multiply the amount of memory used, result in lots of extra parts, and is not a suggested method (although it might work for you).
Fluent are aware of this issue, and have been requested to correctly export multiple injections to a single set of Measured Data files. Their schedule for that improvement is currently unknown.
However, in the meantime, there is a potential work around for this. With a short python script, one can merge the various injections into a single set of measured data files, so that you can visualize all of the injections in a single case. In addition to merging the injections, the routine also creates one additional variable called “inj_id” for the injection ID. Thus, you can still analyze, interrogate, visualize separate injections within EnSight, even though it is contained within a single Measured Data Part.
The ptyhon routine does require a very minor edit, based on your particular dataset, variable export, and timesteps.
A short video tutorial on using this python utility (including the basic editing for your dataset) is provided below.