Learning Forum

[arz25]

Hello to all. I'm a simple user at Ensys. I wanted to simulate a two-dimensional rotating airfoil with some parts porous for my dissertation at the end of the year.
I had a few questions in this regard to draw geometry, should I use pressure jump or use a porous medium?
Or use the perforated wall boundary condition?
My goal is to reduce the drag coefficient.
Should I consider two different zones?
How do I make geometry?
Thank yo

[Rob]

You may want to add some images. The options you suggest should all work, so it's now a case of understanding and choosing the best one.

[arz25]

ok. thanks

[Rob]

In with the text please, staff are not permitted to open attachments.

[arz25]

These photos are for static mode, to which the rotation has not been added yet.I used two methods, one of which was to separate the mesh in the cavity on the airfoil using the separation command and create a pressure jump condition on it.In the next case, I separated the end part from the mesh and applied the pressure jump condition.
How can I create two zones, one for fluid and the other for porous media in the steup fluent?
Do I have to activate the rotation condition for two zones to rotate the airfoil? I want the porous zone to be next to the fluid zone. Do I have to use the interface for the common boundary between the fluid and the porous medium?

[arz25]

Sorry I did not know that.
In the next comment, I provided the explanation

[arz25]

These photos are for static mode, to which the rotation has not been added yet.I used two methods, one of which was to separate the mesh in the cavity on the airfoil using the separation command and create a pressure jump condition on it.In the next case, I separated the end part from the mesh and applied the pressure jump condition.
How can I create two zones, one for fluid and the other for porous media in the steup fluent?
Do I have to activate the rotation condition for two zones to rotate the airfoil? I want the porous zone to be next to the fluid zone. Do I have to use the interface for the common boundary between the fluid and the porous medium?

[Rob]

If you want a separate zone (finite thickness) then use porous media, for a perforated plate (like a flap or the old air brakes on dive bombers) then porous jump may be more suitable.
To create separate zones in split the volume (or surface), then put the two bodies into a single part. Label the main region as "fluid" and the other region as "fluid-porous": "fred" and "ginger" also work as labels but aren't as useful.....
Which bit is rotating and in what direction?

[arz25]

Thank you for your quick and complete replay.
I drew this shape to better understand and clarify the issue.
The axis of rotation is z
And I will use the SMM method for simulation.
The question for me is which method to use for solve Use pressure jump Or use a porous area?
And that if I use a pressure jump, I split the solid body of the airfoil and create a pressure jump in that area?

[arz25]

In the previous comment, I forgot to mention that the simulation is to be done in two dimensions

[Rob]

Assuming z is along the wing "axis" ie is into the page then I'd use sliding or deforming mesh depending on what you're after. With the holes in the image, you need to be careful with the 2d assumption, but you also need to decide what's underneath the holes. Ie does that section cover a cut out? If so, you need that in the model too: we're modelling all of the fluid zone(s).