[jeanbvb]

Hi guys.

I'm trying to simulate a shear driven flow (Couette flow) with different temperatures between the superior an inferior boundaries, with the top wall moving an the bottom wall at rest. I'm using OpenFoam 2.4.0.

For that I'm plainning to use the buoyantPimpleFoam solver. The superior and inferior boundaries are of the type wall, and the horizontal boundaries (streamwise and spanwise directions) are of the type cyclic.

For the phi field it is needed to specify a value for the cyclic boundary condition, and I dont know the right way to set this. Setting it like the code bellow I'm able to run my case, but I think that it makes no sense setting it to uniform 0 on the cyclic boundaries.

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

internalField   uniform 0; 

boundaryField
{
    bottomWall
    {
       type            fixedValue;
	value 		uniform 0;
    }
    topWall
    {
       type            fixedValue;
	value 		uniform 0;
    }

    sides1_half0
    {
       type            cyclic;
        value           $internalField;
    }
    sides1_half1
    {
       type            cyclic;
        value           $internalField;
    }

    sides2_half0
    {
       type            cyclic;
        value           $internalField;
    }
    sides2_half1
    {
       type            cyclic;
        value           $internalField;
    }

    inout1_half0
    {
       type            cyclic;
        value           $internalField;
    }
    inout1_half1
    {
       type            cyclic;
        value           $internalField;
    }

    inout2_half0
    {
       type            cyclic;
        value           $internalField;
    }
    inout2_half1
    {
       type            cyclic;
        value           $internalField;
    }
}

Also for the Ubar configuration in the constant/transportProperties, being it a shear driven flow, it is still necessary to specify the mean flow velocity or setting Ubar to ( 0 0 0 ) would be ok?

Regards.

[nimasam]

as much as i know, here the value is place holder and your assigned magnitude is irrelevant.

[jeanbvb]

Originally Posted by nimasam

as much as i know, here the value is place holder and your assigned magnitude is irrelevant.

Hi Nima, indeed the results for the ciclic bc seems to be correct having a quick view of the flow in paraView.

Thanks for your replly.