Pressure Drop due to Friction
Hi,
Let me Explain the conditions of problem. Pipe Ø4mm, Air velocity 50m/s, Turbulent flow, Dy viscosity 1.79E5 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 InletVelocity inlet 50m/s and outletmassflow outlet 7.539E9 kg/s and mentioned Roughness Height also for account of friction factor. In physics continuum..Constant density/Segregated flow/Steady state/KEpsilon Turbulence. Can u tell me what i did wrong in software? Thankyou, Sam0508 
What is your 'calculation' value (is it from an empirical experiment)? If so, the CFD and empirical calculation should not necessarily be expected to match exactly.

Pressure drop due to friction
Quote:
**** Hi Ryan Coe, It's not a experimental value, found by normal Dp(Pressure drop) Derived equation.i.e Dp=(f*L*rho*V2)/(2*D) Dp units Pa [f= friction factor(beased on Reynolds No and Relative Roughness), L=Pipe lenght 0.1m, rho=Density of Air, V= velocity of air 50m/s and D=Pipe diameter] Why this values is not match with Theoritical data/Derived one.the difference(STAR CCM+ result DpTheoritical Dp result) is 170Pa,how we can accept? or What i did mistakes in this. Plz give ur feedback.Thankyou 
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