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Old   November 2, 2020, 11:29
Question wind inlet with angle
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Anonymous
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Hey everyone,


We have a wind tunnel (18x4x2 m3) that blows wind with a slight angle of around 10 degrees (TBH, depending on the speed, the angle changes). I'd like to simulate the wind in our wind tunnel in OpenFOAM, and I'd like the wind to have some angle as well (I don't need it to be precise, I just want don't want a straight wind flow).

So, what I did is to simply set the U fixedValue of my inlet in folder 0 to "uniform (-0.1 0.1 0);", but it seems like only the inlet cells get the angle and the rest of the cells get straight wind flow. I attached the paraview glyph representation and here is what I have in my U file in 0 folder:
_____________________________

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
inlet
{
type fixedValue;
value uniform (-0.1 0.1 0);
}
outlet
{
type zeroGradient;
}
walls
{
type fixedValue;
value uniform (0 0 0);
}
}
________________________________


I also tried to set internalField to the same value as the inlet, but I ended up with the same result as before.

BTW, I need the steady state flow, and I'm using simple as solver.

Is there anything else that I need to change? I'm attaching the case, so any feedback or comment would be greatly appreciated.
Attached Images
File Type: jpg paraview_windtunnel.jpg (101.4 KB, 12 views)
Attached Files
File Type: zip map0_wind0.1_angle.zip (15.5 KB, 0 views)
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Old   November 8, 2020, 17:28
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Ran
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Quote:
Originally Posted by fr_epfl View Post
Hey everyone,


We have a wind tunnel (18x4x2 m3) that blows wind with a slight angle of around 10 degrees (TBH, depending on the speed, the angle changes). I'd like to simulate the wind in our wind tunnel in OpenFOAM, and I'd like the wind to have some angle as well (I don't need it to be precise, I just want don't want a straight wind flow).

So, what I did is to simply set the U fixedValue of my inlet in folder 0 to "uniform (-0.1 0.1 0);", but it seems like only the inlet cells get the angle and the rest of the cells get straight wind flow. I attached the paraview glyph representation and here is what I have in my U file in 0 folder:
_____________________________

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
inlet
{
type fixedValue;
value uniform (-0.1 0.1 0);
}
outlet
{
type zeroGradient;
}
walls
{
type fixedValue;
value uniform (0 0 0);
}
}
________________________________


I also tried to set internalField to the same value as the inlet, but I ended up with the same result as before.

BTW, I need the steady state flow, and I'm using simple as solver.

Is there anything else that I need to change? I'm attaching the case, so any feedback or comment would be greatly appreciated.

What is your domain of interesting. People usually manipute the object with attacking angle instead of changing the wind tunnel.
__________________
Yours in CFD,

Ran
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Old   November 9, 2020, 09:32
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Anonymous
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Thanks for your reply.

I'm interested in the wind velocity in the internal field. I don't see how I could manipulate the entire field. I would appreciate it if you had any suggestions on this.


Best,
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