The Department of Materials Science at Harvard University did lots of modeling of energy harvesting from piezoelectrics and other polymeric electroactive materials (EAP). Here is the website:

www.harvard.edu

Hope this helps answer your question.

Professor Yehia Khalil

Yale University

USA

Thank-you Sir @Professor Yehia F. Khalil. for your valuable Reply.

Dear M. Toyabur Rahman,

I'm dealing with this problem in COMSOL. Could you please help me with that?? How to Model 3D piezoelectric harvester in COMSOL???

Many Thanks,

Mahmoud