metal helix and the magnetic field calculation

Hi!

I have a question about a simulation done in ACDC physics.
What I am trying to simulate is the magnetic field lines when there is a metal helix and current passing through it from one end to other.
Since the current is circulating in helix, shouldn't the magnetic field show up? When I try to see it, what I see is the arrow lines of magnetic field shown in the picture. So, they do not show one unique direction.

What might be the problem? If you have idea, I would like to hear it.

Thank you,
Ceren



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physics undergrad
loves photon.