Reply To: Compare between Volume Flow Rate and calculation with Simpson 1/3 rule.

[Makara]

thanks for your fast reply.
The Velocity from At Y=3mm to 18mm is about 1% difference. But I if we compare between Y=1mm, 2mm and Y=19mm the difference is about 45%. and I use no slip boundary condition but there is still have x-velocity Y=0mm and Y=20mm too.