The following issues are known to affect BlasterSim:
If the flow rate is too high (typically through making d_e too large), BlasterSim can become unstable and produce inaccurate results. This problem can be solved at the moment by making the time step (dt) small enough that the instability disappears, however, this can make running BlasterSim slow.
Plunger impact with the end of the plunger tube is not handled yet as discussed in § 2.1.10.
Additional issues may be available on GitHub: https://github.com/btrettel/blastersim/issues