Reply To: porousPlate2d
Any OpenLB case can be executed sequentially (this is just parallel with nProcess=1 after all :-)).
We also sometimes observe such gnuplot warnings/errors on some systems – generally you should be able to ignore them. Just to confirm: The output is correct despite the error on your system?
(In general I would recommend to not rely on the gnuplot interface for any serious post-processing – it is neither good for performance (as the gnuplot process blocks execution of the simulation) nor convenient to re-plot results for large simulations without rerunning them.)