A new method for the design and manufacture of flow conditioning devices has been developed. The devices are capable of producing any desired outlet flow profile consisting of total pressure and flow angle (swirl) distributions. The method utilizes new computational procedures for the aerodynamic and mechanical design of the device, providing improved accuracy for aerodynamic flow and expanded capabilities for producing a desired flow field. Along with increased capability, cost and time associated with producing the device are drastically reduced with respect to current practice. The method is capable of producing any arbitrary total pressure and swirl field, either individually or in combination.