I recommend ABAQUES software for this purpose. It is somewhat close to ANSYS software for being a finite elements analysis (FEA) software tool.

Also, I recommend that you visit the U.S. Department of Energy (US DOE) as they have many downloadable (at no cost) software for solar thermal systems. Here is the link:

www.doe.gov

Also try the national renewable emery laboratory website at: 

www.nrel.gov

and Sandia national laboratories at:

www.snal.gov

Hope this helps answer your question.

I cover such topics in my Yale College course.

Khalil, Y.F. (2016). Green Energy Systems (GES). ENVT S-105, Yale College, New Haven, CT 06520

Professor Yehia Khalil, Yale University, USA

Fellow of the University of Oxford, United Kingdom

I suggest you transys rather than ANSYS

Ansys is better option for solar thermal analysis

TRANSYS is better