Thermal Engineering is a specialised sub-discipline of Mechanical Engineering that deals exclusively with heat energy and its transfer between not only different mediums, but also into other usable forms of energy.

You can go for below provided names -

List of Mechanical short term courses
AutoCAD
CATIA
Solid Edge
Pro-E
Ansys
Solid Works
CAD/CAM software
Fluent / Gambit
CNC Programming
Unigraphics
Coade
Piping - Stress Analysis course for Mechanical Graduates
PATENT CLAIMS DRAFTING
Computer Aided Manufacture
Diploma In Tool Design
Course in CNC Machining
Robotics lab
Engineering drawing courses of higher level
Matlab course etc.

Hope this helps!!!