I would like to make the angular velocity in a rotational speed be a function of the torque so that it is adjusted
until the torque reaches a desired value. How can I do this?

You can let the angular velocity of a rotating domain be a function of the torque exerted on one of the rotating components. It's best to do this with a User CEL function which keeps track of the rotation rate at the start of each new outer loop iteration and adjusts it with the start of each outer loop based on the current value of the torque and the desired value.

An example FORTRAN file, FORTRAN output file, and CFX output file are attached. The files are based on the axial rotor-stator tutorial in ANSYS CFX 11.0, Tutorial 12. The definition file can be found in the Examples directory of the CFX installation.

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