coef of drag and Re

November 2, 2001, 15:49

I am trying to work through the derivation of why Cd is proportional to 1/Re at low Re, directly related....why Cd is constant with respect to Re at high Re. Any help would be greatly appreciated.

November 3, 2001, 02:45

How to define your Re. number?

Re=U*d/nu ?

In your case, what is d ? Are you studying on the bluff body aerodynamics? Depends on the body shape (geometry), the values of coefficients are different.

Now, I almost finished calculating Reynolds number dependency analysis of two-dimensional square cylinder using large eddy simulation.

Reynolds number range is from 20 to 22000 and the aerodynamic coefficients are Cd_mean, Cl_mean, Cd_rms, Cl_rms, Strouhal Number. Pressure on cylinder and velocity fields around cylinder are also analyzed.

If you have interesting on this fields, please send e-mail.

November 2, 2001, 15:49	coef of drag and Re	#1
ucsd Guest Posts: n/a	I am trying to work through the derivation of why Cd is proportional to 1/Re at low Re, directly related....why Cd is constant with respect to Re at high Re. Any help would be greatly appreciated.

November 3, 2001, 02:45	Re: coef of drag and Re	#2
Jongdae Kim Guest Posts: n/a	How to define your Re. number? Re=U*d/nu ? In your case, what is d ? Are you studying on the bluff body aerodynamics? Depends on the body shape (geometry), the values of coefficients are different. Now, I almost finished calculating Reynolds number dependency analysis of two-dimensional square cylinder using large eddy simulation. Reynolds number range is from 20 to 22000 and the aerodynamic coefficients are Cd_mean, Cl_mean, Cd_rms, Cl_rms, Strouhal Number. Pressure on cylinder and velocity fields around cylinder are also analyzed. If you have interesting on this fields, please send e-mail.