Good evening. I am a student, doing a project regarding CFD simulations for a Stirling engine. I would like to ask how would one set the boundary conditions such that I could simulate a cycle involving the expansion of the working fluid and the pressure changes that would bring about the movement of the displacer (or piston).
Initially I had tried to simplify the problem by having adiabatic walls, and then setting a single real wall at the hot reservoir with a high temperature. When I run the simulations, however, there was barely any results apart from the immediate vicinity of the wall.
I had tried scouring the internet for possible solutions, but have ultimately hit a dead end. Would someone point out my mistakes and advise me on how I could fix it, please?
The following is some screenshots of my cut plots
http://puu.sh/nZnIY/6ab133b4ef.jpg
http://puu.sh/nZnIY/6ab133b4ef.jpg
Well, you're not going to be able to simulate the motion of the cylinder, so I'm not sure how useful your simulation will really be. You can't really decouple the motion of the piston from the problem.