Discussion Forum

Dear community,

I have a question about a model that I have created in COMSOL Multiphysics.

I am modelling a piezoelectric transducer that is glued to a glass tube containing water. The piezoelectric transducer has a voltage applied to it at a certain frequency, which makes it vibrate. This induces a vibration in the glass tube as well, which would in reality create standing waves in the water (this has been proven by experiments).

My goal is to find the acoustic pressure in the water at certain points.

So far, I succeeded in creating a transducer and making it vibrate. I have also attached a glass tube to it (with Form Union, but I think it should be done differently).

The problems that I am encountering are: - When I add water to the inside of the tube, I need to add material properties for Water such as Elastic Modulus (which don't exist for water to my knowledge). It seems to apply Electrostatics and Solid Mechanics to Water, which shouldn't be the case. - I don't know how to add a Glue connection between the transducer and the tube. - I can't seem to find the correct combination of Physics that is needed to eventually find the acoustic pressure in the water.

So my questions are: - How do I add a glued connection between the transducer and the tube? - How do I add water in the tube, without the program asking me to provide material properties that don't exist? - Which modules do I need to add to find the (acoustic) pressure in the water?

I have added some pictures for clarification.

Thanks in advance.

Kind regards, Lars