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dispersion with radial velocity

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Old   September 10, 2019, 14:55
Default dispersion with radial velocity
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Dear OpenFoam users,

I'm trying to simulate the dispersion of a plume with an initial radial velocity of around 10 m/s (the plume is expanding in all the directions).

I'm working in incompressible with pimpleFoam and I've set a concentration scalar (dye), as I would have set temperature.
Would you know how I can set the initial velocity of the plume?

I've tried to use funkySetField but it does not work at all (it works well for a vertical initial velocity but fails when I set a radial velocity - it might be due to the fact that I try to expand something that cannot be expanded in incompressible because a negative pressure appears in the center of the plume and stop the dispersion).
I've also tried to set a concentration source, as well as a velocity source or a pressure source. But it's not working neither, I don't succeed to give the initial "push".

Does someone have an idea about how to solve the problem? It would be a great help to me.

Thank you very much in advance,
Charline
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Old   September 12, 2019, 14:16
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no idea ?
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Old   September 13, 2019, 02:59
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Just a weird idea: Maybe you could create a spherical mesh (computational domain = space between two spheres) and set the velocity normal to the inner boundary to be 10 m/s. I think the pressure could then adapt. In 2D it would be a circle in a circle.
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Old   September 13, 2019, 12:24
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Quote:
Originally Posted by raumpolizei View Post
Just a weird idea: Maybe you could create a spherical mesh (computational domain = space between two spheres) and set the velocity normal to the inner boundary to be 10 m/s. I think the pressure could then adapt. In 2D it would be a circle in a circle.
Hi Raumpolizei,
Thank you for your reply. I will have a try ! I'm running out of ideas right now so thank you
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