[Robbb]

Hello everyone. I'm simulating a fluid flow through an helicoidal heat exchanger. The fluid (liquid) gets heated along the exchanger. When I'm post-processing the simulation and I'm trying to display pathlines starting from the inlet to calculate total temperature profiles along the exchanger, everything is ok but there's always one single pathline which doesn't escape the exchanger, or better.. this single pathline takes much longer to escape the exchanger. I've tried to change the flow rate entering the exchanger, but there's always the same problem. How can I fix this?