[BLK]

Hello,

I am wondering if there exists a boundary condition for vacuuming (aspiration) suction in OpenFoam. I need to simulate an air blowing process at the top of a greenhouse with aspiration at the bottom. Any help would be greatly appreciated.

Thank you in advance.

[Alczem]

Hey


You can simply impose a fixedValue boundary condition in 0/U with the vector leaving your domain. An alternative is using the flowrateInletVelocity condition with the a negative sign (or positive, not sure ). Just make sure the pressure can be balanced somewhere !

[BLK]

Hey Alczem,

Thanks for the tip, the calculation works but I have problems with k and epsilon.

For the BC of k and epsiole, should i impose the same condition as inlet fixedValue or an outlet condition? and for the estimation of k and epsilon it will be the same as the inletor I have to calculate it according to the size of my inspiration outlet.

Thanks!

[Alczem]

Originally Posted by BLK

Hey Alczem,

Thanks for the tip, the calculation works but I have problems with k and epsilon.

For the BC of k and epsiole, should i impose the same condition as inlet fixedValue or an outlet condition? and for the estimation of k and epsilon it will be the same as the inletor I have to calculate it according to the size of my inspiration outlet.

Thanks!

I usually use inletOutlet conditions for my inlets and outlets, so that a zeroGradient condition is applied whenever the fluid is leaving the domain, and fixedValue for the fluid entering the domain. I prefer to compute my turbulent values by hand rather than use the different turbulent boundary conditions using a mixing length or intensity and so on.