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Setting a Velocity profile for a circular boundary |
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February 5, 2016, 13:55 |
Setting a Velocity profile for a circular boundary
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#1 |
New Member
Join Date: Nov 2014
Location: SP, Brazil
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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! |
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February 5, 2016, 17:07 |
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#2 |
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Posts: 892
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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).
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February 8, 2016, 08:47 |
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#3 |
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Join Date: Nov 2014
Location: SP, Brazil
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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'! |
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February 8, 2016, 23:21 |
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#4 |
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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. |
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February 11, 2016, 08:22 |
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#5 |
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Quote:
Thanks again 'e', |
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