[lyro]

I've modeled a 4 riser solar water heater with a 5l water tank above it. Using coupled with 2nd order methods. No initial velocity or anything on the system, I'm trying to simulate thermosyphon action with 1000 w/m2 heat flux on my collector panel. I've been running the iterations for few hours now and the residuals look interesting. Yet nowhere on the console is any error message and solution converges for each time step (1s) for now. Are the scaled residuals normal, or can you guys spot anything funny about the system.

https://imgur.com/gv3sYc1