[willscottmatt]

I would like to increase the velocity of the fluid throughout my channel395 simulation, because I want to look at the development of the boundary layer as velocity increases. However with the cyclic boundaries I don't know how to include the velocity inlet as a ramp or something like that. So instead I looked at adding a body force to pimpleFoam to accelerate the fluid. Even with the information on this forum pertaining to body forces, I am absolutely lost as to where to start and I really would like someone to just dumb this down for me, because I am pretty new to this.

Regards,

Will

[oswald]

Hi Will,


try changing Ubar in /constant/fvOptions

[willscottmatt]

Thanks for your reply Oswald,

I have been playing around with Ubar, but I don't know how or if it is possible to get it to increase from 0 to 0.5 within the simulation time frame.

 
momentumSource
{
          type                  meanVelocityForce;
          active                yes;
    
          selectionMode     all;
          fields                 (U);
          Ubar
          {
                       uniformValue    table
                       (
                                     (0 (0 0 0))
                                     (1000 (0.5 0 0))
                       );
           }
}

No I know that to anyone even slightly experienced in openFOAM there is a lot terribly wrong with this code, but I hope it gives some idea of what I'm trying to do.

Thanks for reading

Will M