[skuznet]

I'm trying to make a simple case - flow through a channel with no-slip BC at boundaries of the channel.
I've prescribed fixedValue uniform velocity and zero gradient pressure at inlet.
At outlet I've prescribed fixedValue pressure. (p=0) and zeroGradient velocity.

I can run this case with these BC conditions, however velocity profile at inlet will be uniform and will not satisfy no-sleep BC and boundaries.

Is any way to prescribe average velocity or total flow at inlet to satisfy zero BC for velocities?

I was looking for the BC type here http://www.openfoam.org/docs/user/boundaries.php
but was not able to fine average velocity or total flow type.

[nimasam]

i guess you have two options :

1- using flowRateInletVelocity

Example of the boundary condition specification for a volumetric flow rate:
\verbatim
myPatch
{
type flowRateInletVelocity;
volumetricFlowRate 0.2;
value uniform (0 0 0); // placeholder
}
\endverbatim

Example of the boundary condition specification for a mass flow rate:
\verbatim
myPatch
{
type flowRateInletVelocity;
massFlowRate 0.2;
rho rho;
rhoInlet 1.0;
}
\endverbatim

2- define a non-uniform inlet with :
groovyBC or code-stream

[skuznet]

Salam!
Nima, thank you for you reply. I was able to run my case with inlet defined with keywords your suggested

type flowRateInletVelocity;
volumetricFlowRate;

However, the velocity profile is still uniform. Can I require velocities to satisfy no-sleep BC, i.e. zero velocities on the boundaries of the channel?

[nimasam]

i guess so ,
however if you applied no-slip condition and still you have uniform velocity, then you may want to try the second option

[luis.felipesteves]

Hi Sergey,

I know it was long ago, but have you found any solution for the problem?