Flow simulation in Axial Pump Impeller
 

I am now carrying out flow simulation of Axial Flow Pump (Impeller)by using Solidworks, one of CFD commercial software. here, pressure drop is happening instead of pressure rise. according to theory, pressure in axial pump should be risen at outlet than inlet. What will I do? pLs suggestions or comments. And then, Most of flow simulation in Solidworks, Environmental Pressure (101325Pa) is specified as Outlet boundary conditions. Why is it used? please may I Know.
Respectfully
Aungkyaw

i am looking forward to getting your answers or suggestions as quick as possible.
Thank you