Hi

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 ?!!

have not validated your calcs/equation as I assume you have checked those thoroughly so here are some questions:

have you checked a surface goal instead of just global goal?

do pressure and velocity/pressure distributions look correct?

has the solution converged completely?

have you checked drag force in addition to the Cd?

what does your mesh look like?

how big is your comp domain?

have you tried a transient analysis?

have you looked at the tutorial/validation problem in the documentation for this exact setup?