Aeroacoustic engineer to find a practical solution to reduce aerodynamic noise of a new product

We need a professional aeroacoustics engineer with a good experience in practical solutions for reducing the aerodynamic noise. Noise in our product (an air conditioner) is produced mainly from high speed air flow within a small gap, and of-course increasing gap is not possible. The solution provided should be practical and suitable for mass production. Noise should be less than 65 dB at the end, while until now it’s about 70 dB. You should provide a CFD simulation on any software (ANSYS Fluent is preferable) to make sure that this solution is successfully reduces noise. We will ask you to sign an NDA (Non-Disclosure Agreement) because it is an innovative design.