[firavia]

hello I have been trying to do a CFD simulation on a venturi pipe using RNG k epsillon method, the solution converged but when I took a plane to check the velocity profile on it I found out that in the middle of the section plane the velocity is low and on the sides near the wall the velocity get high thn it come close to zero near on the wall.

I have attached an image for the simulation , I just want to know if this is normal or not .
flow rate is :387 kg/s. fluid is water. inlet diameter is 0.8m , diameter of the pipe after the constriction is 0.4m. the section plane was taken in the constricted area.
Please find attached 2 images showing the velocity profile and the geometry of my case.