AnsweredAssumed Answered

error with flow simulation in calculus

Question asked by Mohamed Samy on Oct 26, 2014
Latest reply on Oct 28, 2014 by Jared Conway


I'm using flow simulation in solidworks on sphere to get drag coefficient and known that the drag coefficient = 0.44 when Reynold number = 10,000 to 10^5
So I draw sphere with radius of 0.025 m and made speed = 3.1 m/s then
Re =V*D/v where v = kinematic viscosity = 1.5111 * 10^-5
Re = 10,250


I made global goal force(x) and velocity(x) and i made equation goal cd = 2*force(x)/(1.204*3.141592*0.025^2*velocity(x)^2)

and after running cd not equal 0.44 it equals 0.17 !!

is it error in program or in my calculations or in what ?!!