Have been trying to set up a thermosyphon or NCL. Couple of issues
In an open volume I can get the NCL working no problem. If I take the center out of the volume, basically where v = 0 at the center, I get some type of inverse flow which is very odd.
Setting up closed loop with the settings from the transient heat tutorial, but with the flow solved for velocity vector. To do that I used the setting for the volume from the pipe tutorial. I keep getting an error message in the log:
RANS Flow failed
Solver singularity: smoothSolver: Solving for epsilon, Initial residual = nan, Final residual = nan, No Iterations 100
Any idea what is happening?
Also is there any way to reset the simulation once you have run a time on it? E.g. to clear the sim back to the set-up point.
And for a last question I tried to set up the NCL under compressible and the iteration did not converge. NCL's ostensibly should have a density component to the sim based on the thermal input. Is there any way to do an NCL as compressible or density variable in this software.