I have to model a pipe with a
 

I have to model a pipe with a circular corona inlet all around the pipe circumference.

I have to specify a velocity normal to this boundary. How can I do it in OpenFOAM?

Thanks in advance
Alberto

surfaceNormalFixedValue (in Op
 

surfaceNormalFixedValue (in OpenFOAM/lnInclude/surfaceNormalFixedValueFvPatchField.H)

needs a 'refValue' entry which is the outwards pointing velocity (so negative for inflow)

Thanks!
 

Thanks!

Hi, it seems that I have a
 

Hi,

it seems that I have a similar problem... I would like to calculate a hvac duct and have to set the inlet velocity normal to the boundary. Unfortunately, I do not understand, what Mattijs wrote as a hint!?

Regards!
Fabian

If the boundary is flat, use f
 

If the boundary is flat, use fixedValue and specify the appropriate components of the velocity.

If it's not flat You can use:

type surfaceNormalFixedValue;
refValue uniform Umag;

As Mattijs said, if you want your flow to enter your domain, Umag has to be negative.

Regards,
Alberto

Hi, On a similar note, if I
 

Hi,

On a similar note, if I were to simulate boundary layer suction or blowing, would it be valid to use an ordinary wall boundary condition with a (strictly) normal velocity specified (either by using fixedValue or surfaceNormalFixedValue), or would a specialized boundary condition need to be build?

Also, could, for moderate normal velocities, a wall function still be used? Or will a low-Re turbulence model be required?

best regards,
Roland

Hi Alberto, thanks for the
 

Hi Alberto,

thanks for the help!

Regards!
Fabian