Discussion Forum

For simulation of fluid actuated piezoelectric energy harvester in COMSOL, I performed following steps

1. I choose physics of Fluid structure Interaction and Piezoelectric Devices.
2. In study, I selected Stationary.
3. Next, I designed the geometry of energy harvester as defined in the paper.
4. In materials, I have used PZT 5H for piezoelectric layer (domain 4) and Aluminium for substrate (domain 3) and D shaped bluff body (domain 2).
5. Under fluid structure Interface I choose all the domains
(i) In fluid properties, i selected Domain 1, where the fluid is flowing and then defined its density and dynamic viscosity as given in paper.
(ii) I choose Inlet and Outlet boundaries as defined in paper. Rest of the boundaries have no slip condition.
(iii) In the linear elastic material i choose piezoelectric layer (domain 4) and Aluminium for substrate (domain 3) and D shaped bluff body (domain 2).
(iv)In fixed constraint I fixed bluff body.
6. In solid mechanics part
(i) I have selected substrate and bluff boy under linear elastic material and piezoelectric layer under piezoelectric material category.
(ii) Top and bottom surfaces of piezoelectric material has been grounded.
7. In mesh I used physics controlled mesh
8. Now for study, I used direct solver.
problem: Nonlinear solver did not converge and it shows infinity values

Please help me...in solving this problem.