# Suction simulation

Member

I would like to simulate the suction on an airfoil using fluent

the airfoil diagram is shown below, there is a suction slot which the sucked air flows through that leads to the low-pressure cavity which causes the suction.

The idea is to induce high energy turbulent mixing in the boundary layer flow and delay/prevent flow separation, thereby preventing stall

How do I simulate this environment in ANSYS Fluent.

Thanks

• Forum Coordinator
edited March 2019

https://confluence.cornell.edu/display/SIMULATION/FLUENT+-+Flow+over+an+Airfoil-+Problem+Specification

• Member
edited April 2019

Hello,

I don't see any tutorials on how to create suction.

I just need to know how to create a low-pressure environment in the suction cavity i.e. how do I specify boundary conditions that create a low-pressure environment?

Thanks

• Member
edited January 2020

Did you found an answer to this question? I have the same problem.

• Member
edited January 2020

I'm not a CFD expert, but I would assign the vertical edge inside the low pressure cavity to be a Pressure Outlet. Assign a negative gauge pressure to that outlet.  That creates the suction.

There would be a large air domain around the airfoil with an inlet velocity boundary condition on the left side, and a pressure outlet boundary condition on the right side that would have a zero gauge pressure.

• Member
edited January 2020

I changed the geometry entirely, what I did was to make a section of the airfoil wall a velocity inlet BC or a pressure outlet BC

• Member
edited July 2020

hello man..I am trying to do this same problem. But split the edge of the upper surface of NACA 0018 and define pressure outlet BC. But if I create slot at 60% length of the chord, mesh on the face adjacent to the slot becomes unstructured. Can you please give me some solution.. I need to complete this urgently.