[YanNW]

Dear all,

I got one thing confusable in my simulation. Here is the brief of my computation.

I am simulating to get the wind coefficient over the 3D structure. Let's say the structure has the length 0.44725 m and projected are is 0.2422 m2. Assuming at 15C, the kinematic viscosity of the air is approximately 1.48*10e-5. My plan is to simulate this structure in different wind speeds and to compare the drag coefficients. So, I keep kinematic viscosity (nu), length constant. And I kept changing U as 5 m/s, 10 m/s, 15 m/s, 20 m/s, 25 m/s etc.

Here is my problem. The drag coefficients for all cases are similar. I cannot see any differences that is quite strange.

When I look at many others' computation, I saw some of them keep U fixed and changed Rn so that (nu) is changing. Is that physically meaningful?

Please anyone who got experiences on the case like this, suggest me what is the point of problem.

Thanks.