acoustic streaming using surface acoustic wave

I want to simulate the acoustic streaming effects due to a surface acoustic wave....I understand from literature that the acoustic streaming can be obtained using a two subproblem- acoustics and acoustic streaming.There are some equations available for the both subproblems. But I dont understand, how to model them in COMSOL.

If someone is aware about this, could you please help me!!!!

Thanks & Regards,
Rahul Kishor