Also, I'm not quite sure what you meant by acoustic extension being available as a standard system in Ansys 2020 R2. Does that mean that it should already be available with the standard installation of Ansys mechanical? In that case, I should clarify that after I installed Ansys, specific acoustic functionalities such as acoustic body or acoustic sources were not available in Harmonic Response module. Could you please explain how to access those functionalities to Ansys 2020 R2?.Thank you,nParinazn