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Old   July 16, 2010, 13:19
Default advective BC
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Pascal
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Hi all,

I try to use advective boundary condition with icoFoam (incompressible) in a 2D simulation with OF 1.6.x. here's how I declare it in 0/U file :
Code:
boundaryField
{
    outlet
    {
        type            advective;
        phi             phi;
    }
    frontAndBack
    {
        type            empty;
    }
}
But at the end of the simulation 'value uniform (0 0 0);' has been added and I don't know why :
Code:
boundaryField
{
    outlet
    {
        type            advective;
        value           uniform (0 0 0);
    }
    frontAndBack
    {
        type            empty;
    }
}
Is it the right way to use this BC? Is it the same explanation that has been written in the following thread #18-19 ? (for a cyclic boundary condition) :
http://www.cfd-online.com/Forums/ope...condition.html
Right now, when I use the advective BC, my BC behaves like a wall with a no-slip condition which is totally different of what I expected... Should the advective BC acts like a non reflective boundary condition?? According to the source code description it is supposed to implement the following equation at the BC : DDt(psi, U) = 0 If anybody has an explanation of what I did wrong, please let me know!

Thank you very much,
Pascal

Last edited by Pascal_doran; July 18, 2010 at 22:46.
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Old   August 5, 2015, 07:15
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Agustín Villa
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Hello!

I know this post is quite old, but I have seen your post and I'd lilke to know if you found any solution to this.

Thanks!
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Old   May 30, 2019, 23:31
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Jianrui Zeng
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I am also interested in this post, can anyone give an explanation?
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