Velocity profile

[mimarilker]

Hi,

Speed increases linearly with wind intensity for fluid (Note to ObiCloth users: for cloth it doesn't, there the airfoil lift/drag equations are used). That means you can do 

Code:

wind intensity = f(x)

where f() is a logarithmic function (or any other function), and the speed response will be the same as if you did:

Code:

speed = f(wind intensity)

cheers,

Hi,

I am not sure if I explain it correctly, actually I need this wind speed profile at the emitter location. So I dont need any increasing or decreasing wind speed with distance based on a function. 

Wind speed should change in the emitter with respect to the particles' locations (height from the ground or zero). Let's assume a vertical edge emitter, the particles at the lower levels will have low speeds gradually. This is exactly "atmospheric boundary layer". In reality wind speed at higher altitudes has high velocity due to the lower roughness height (since number of obstacles decrease). The attached file includes wind speed power law equation which is very easy to use. Btw, I have alpha values which changes according to the different roughness heights.

Thanks for your response.