I see now that you are running ANSYS 15.0, which is an old release. Does your model run?
I am running 18.2. Is it possible for you to upgrade? I understand this model is too large to run on the Student license.
I gave the bullet an Initial Conditions Velocity and deleted the Velocity boundary condition.
Why did you want the bullet to be rigid? Bullets generally deform when they hit concrete.
I changed the bullet to LEAD from the Explicit Dynamics material library and let it be flexible.
I changed the tank to have 3 elements through the thickness of the tank wall instead of one.
I changed the tank to be CONC-35MPA from the Explicit Dynamics material library.
Why did you set the Reference Energy Cycle to 100? I set it to 0.
I increased the Maximum Energy Error to 100 just so I can see some results.
This model is running now on my 4-core laptop but the Time Inc = 1.108E-13 so it will take 9e9 cycles to get to 1 ms of time. That is way too long. That is why you must rethink your model and reduce the domain to a much smaller piece.
Here is a simulation of compression failure of a concrete cylinder with rebar and the post above is without rebar.
Those simulations were using Explicit Dynamics models and are more for post failure illustration than calculating results.
I assume you are interested in seeing the damage caused by the impact.
Please delete the duplicate posts above.