I have simulated an argon plasma in a coaxial structure by COMSOL. To do this, I have used two interfaces, Plasma and Laminar flow, but in the period I have studied (microsecond), the shape of the flame does not appear at the outlet of the tube, and plasma is formed inside the structure.

When I simulated the movement of the fluid in the tube, the fluid formed its own jet-like profile in 3 milliseconds however the plasma formation occurred at 0.4 microseconds.

1. Can fluid at the plasma interface be defined as flowing from the beginning?

2. What other steps are needed to link these two interfaces?

please guide me. thanks...

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