Reply To: Thermal Poiseuille 2D.
thanks for reporting back.
I tested your example on OpenLB r1.4 and can reproduce the results.
The appearing effect could also be a result of boundary/inlet conditions or dynamics coupling.
Since we have realized a new dynamics concept in r1.5, I would suggest to update your code according to the new release.
If this does not change anything, please let me know again.
Thank you again for contributing!