HI,
I am analyzing a fluid structure interaction using system coupling in Ansys Workbench.
The structural model is similar to a 3D airfoil and air is the fluid medium.
I created "Fluid Structure Interface" in transient structural module.
But I am facing a problem in determining the surface to define as "system coupling" in dynamic meshing part of fluent. Also I need some guidance in putting boundary conditions.
I created enclosure in fluent, and have put following details for boundary conditions and dynamic mesh-
1. Inlet side of enclosure
I have set this to velocity inlet condition and stationery mesh
2. Outlet side of enclosire
This is pressure outlet and again stationery mesh
3. Wall-Enclosure-
These are rest 4 walls of the cubic enclosure.
So I put it under stationary mesh (wall type)
4. Interior Enclosure-
As per my understanding its a interior part of the fluid domain and hence I put that for deforming mesh and set boundary type as interior.
5. Enclosure-
I dont understand how this is different that interior enclosure, but I just set it to deforming mesh and its not there in boundary conditions. Also If I set it to system coupling mesh zone, it shows error that "system coupling does not support mapping to this zone"
These are automatically generated domains/ named connections in fluent. Which one shall I set for "System coupling" dynamic mesh?
I am not able to set up data transfer since the fluid domain contact area is un-access-able.
PLease help me in this,
Thank You,
Prachi
From the statement of your problem, its a bit hard to get the problem description so I suggest could you provide the pictorial representation. Besides, based on my experience in FSI, I must say either you did not apply the proper boundary condition or solid fluid coupling is inappropriate.
Hi,
As Mr Shrish told, please provide an image of your model.
Also I would suggest to name each of the boundaries of fluid domain while meshing to avoid any confusion. So, while applying boundary conditions it will be easy.
Regards,
Mahesh
Hi,
Sorry for the confusion.
To simplify my question,
by default, the boundary conditions generated in fluent are:
1. inlet
2. outlet
3. Enclosure wall
4. Enclosure
For fluid-structure interaction we need an additional boundary at the airfoil surface, which we will defined for dynamic mesh as "system coupling".
How to get that boundary?
The image of simple case of model is attached.
Thanks,
Prachi
Hi, Try to set the “wall boundary condition” for all interface walls in your mesh. If you have more than one interface walls, you can set different names for them. Also, in the fluent, there is no any boundary condition with the title of “system coupling”. Therefore, all interfaces should be defined as “wall” in the boundary condition panel. The “system coupling” should be also defined in the dynamic mesh panel.
So, in your case, the airfoil surface should be defined as a "wall" in the mesh and as well as in the boundary condition panel of the fluent. Also, it should be set as “system coupling” in dynamic mesh panel. The interior part of the domain, which will be changed due to the mesh deformation, should be set as “Deforming” in the dynamic mesh panel.
Regards, Siamak
Ansys mechanical: Select the faces on the wing in the workbench and then in analysis setting insert fluid structure interaction.
Fluent: In the workbench model define the air foil faces with some name.
In the fluent Dynamic mesh couple the airfoil boundary using system coupling option.
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