How to make an Arc Smoother (ie smaller linear intervals)?

I am working on a Rocket Nozzle and I need the throat of the nozzle to be a smooth as possible. In the arc I made, SW simplifies it into 2x linear lines creating a jagged point that completed amplifies the Turbulence of the Flow in CFD. Is there way to increase the # of linear lines to create the arc? Perhaps (10 linear lines rather than 2?) Thanks. Cheers.

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