Black

Subtype of Pricing Method

Assumes that the underlying forward swap rate F follows the Black process so that it is lognormally distributed at any future time.
Concretely F is diffused as dF = σFdw in its martingale measure, where σ may be time dependent.

Note:
This choice expects volatility input with Vol Type = Black

The QuantLib engine used is the BlackSwaptionEngine.