Pressure Drop due to Friction
 

Hi,
Let me Explain the conditions of problem.

Pipe Ø4mm, Air velocity 50m/s, Turbulent flow, Dy viscosity 1.79E-5 N.S/m2, Density of Air 1.23kg/m3.Need of finding the Pressure Drop for 0.1m length.

The Calculation value is 1.076kPa,but in STAR CCM+ got value as 1.255kPa.In software i specified the B.C as Inlet-Velocity inlet 50m/s and outlet-massflow outlet -7.539E-9 kg/s and mentioned Roughness Height also for account of friction factor.

In physics continuum..Constant density/Segregated flow/Steady state/K-Epsilon Turbulence.

Can u tell me what i did wrong in software? Thankyou

Is your mesh fine enough? Try to refine it and have a look what happens.

Pressure drop due to friction
 

Thankyou.let me try...