[priyankap]

Hello everyone,


I have a question related to direction of velocity. shape of my fluid region is given in the figure attached.


The inlet is in the in the x direction, but the pipe has multiple curves in it, so, I am getting confused that in which direction should I define the velocity while putting the initial values and boundary conditions for the velocity (U)? I am currently using the following:

U
{
    internalField   uniform (1.33 0 0);

    boundaryField
    {
        inlet
        {
            type                fixedValue;
            value               uniform (1.33 0 0);
        }

        outlet
        {
            type                zeroGradient;
            
        }

        "fluid_to_box"
        {
            type            noSlip;
        }
    }
}

As you can see in the attached figure, the direction of flow is changing throughout the domain.


So I need to know in which direction should I define my velocity in internalField and at inlet?


Thank you!