[ana_mg]

Dear all,

Could you recommend the best way to assign a velocity profile to a circular surface? I´m making a wind flow study on a circular domain, but I don´t know how to introduce the velocity boundary condition. How can I just assign a velocity magnitude and direction for this case when the velocity signal must change whit the angle?

Thanks in advance!

[`e`]

What is the geometry of the domain and what velocity profile would you like to implement? You can either specify a velocity boundary condition in the normal direction of each cell face or specify the velocity in each direction (x, y, z).

[ana_mg]

A cylinder delimits a portion of a hilly terrain where the wind blows with a heading of 120 degrees west of north. The velocity value could be positive or negative if the vector is entering or leaving the domain, respectively.

Thanks 'e'!

[`e`]

Break the vector up into components (x and y; as well as z in 3-D). For example, your 120 degrees west of north unit vector would be:



Under Define > Boundary Conditions... select the velocity inlet condition and use "Components" for the "Velocity Specification Method". Enter the unit vector (above) multiplied by your wind speed.

[ana_mg]

Originally Posted by `e`

Break the vector up into components (x and y; as well as z in 3-D). For example, your 120 degrees west of north unit vector would be:



Under Define > Boundary Conditions... select the velocity inlet condition and use "Components" for the "Velocity Specification Method". Enter the unit vector (above) multiplied by your wind speed.

Thanks again 'e',