advective BC

Pascal_doran · July 16, 2010, 14:19

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

agustinvo · August 5, 2015, 08:15

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!

calf.Z · May 31, 2019, 00:31

I am also interested in this post, can anyone give an explanation?

July 16, 2010, 14:19	advective BC	#1
Pascal_doran Member Pascal Join Date: Jun 2009 Location: Montreal Posts: 65 Rep Power: 17	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 23:46.

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August 5, 2015, 08:15		#2
agustinvo Senior Member Agustín Villa Join Date: Apr 2013 Location: Alcorcón Posts: 314 Rep Power: 15	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!

May 31, 2019, 00:31		#3
calf.Z Senior Member Jianrui Zeng Join Date: May 2018 Location: China Posts: 157 Rep Power: 8	I am also interested in this post, can anyone give an explanation?