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Old   April 8, 2019, 09:55
Default Suction simulation
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Akin AKinneye
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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

Last edited by Akin-iii; April 9, 2019 at 18:44.
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Old   April 22, 2020, 04:24
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Hi,

Can you explain a bit about the simulation? I am working on the simulation of boundary layer suction as well. Did you try it with a boundary condition on the airfoil surface rather than modeling the slot?
Your suggestions will be appreciated.
Thanks in advance.
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Old   April 22, 2020, 15:03
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Quote:
Originally Posted by Dronzer View Post
Hi,

Can you explain a bit about the simulation? I am working on the simulation of boundary layer suction as well. Did you try it with a boundary condition on the airfoil surface rather than modeling the slot?
Your suggestions will be appreciated.
Thanks in advance.
Yh, that's exactly what I did instead.
I was relatively new to the concept of suction control and hadn't really explored all possible avenues.
I eventually created a suction boundary
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Old   April 22, 2020, 21:41
Default Thank you! Have a few more simple questions
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Quote:
Originally Posted by Akin-iii View Post
Yh, that's exactly what I did instead.
I was relatively new to the concept of suction control and hadn't really explored all possible avenues.
I eventually created a suction boundary
Hi Akin

Many thanks for the reply.

Can you please answer a few more questions?
1) Did you try blowing simulations also?
2) The boundary conditions for suction and blowing are pressure outlet and velocity inlet, respectively, am I right?
3) Is it possible to do the simulations at steady-state conditions, or transient settings are necessary?
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Old   April 23, 2020, 04:07
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Quote:
Originally Posted by Dronzer View Post
Hi Akin

Many thanks for the reply.

Can you please answer a few more questions?
1) Did you try blowing simulations also?
2) The boundary conditions for suction and blowing are pressure outlet and velocity inlet, respectively, am I right?
3) Is it possible to do the simulations at steady-state conditions, or transient settings are necessary?
Hi
to answer your questions
1) No, I only carried out suction simulations as per the objectives of my project.

2) Yes, you're right. You can also use mass flow BCs as well, but using velocity or pressure BCs is most common. In my case, I specified a velocity boundary condition normal to the suction slot/surface
However, I must warn you that the use of a pressure bc at the outlet (suction) will lead to unstable results (as I painstakingly found out) so I'll post a link to another thread on this forum to give an idea of the best blowing and suction combination to use. (If these are the operating parameters of your simulation)
The Boundary Condition of a suction problem

3) You can carry out simulations in steady-state and vary the inlet velocity to simulate a change in the Angle of attack, but for a dynamic stall, the simulations have to be transient
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Old   April 23, 2020, 04:41
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Quote:
Originally Posted by Akin-iii View Post
Hi
to answer your questions
1) No, I only carried out suction simulations as per the objectives of my project.

2) Yes, you're right. You can also use mass flow BCs as well, but using velocity or pressure BCs is most common. In my case, I specified a velocity boundary condition normal to the suction slot/surface
However, I must warn you that the use of a pressure bc at the outlet (suction) will lead to unstable results (as I painstakingly found out) so I'll post a link to another thread on this forum to give an idea of the best blowing and suction combination to use. (If these are the operating parameters of your simulation)
The Boundary Condition of a suction problem

3) You can carry out simulations in steady-state and vary the inlet velocity to simulate a change in the Angle of attack, but for a dynamic stall, the simulations have to be transient
Hi Akin,

Thanks a lot! I will keep your advice in mind.
It is very kind of you.
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