Learning Forum

[mutianzi1]

Hi, I have the following structure. The four side walls are assumed to be rigid. The roof is assumed to be flexible

In ANSYS Workbench, the roof consists of four surface bodies, forming one part. The four side walls are all surface bodies, forming one part. Therefore, there are two parts for the numerical model.

The behavior of the roof surface bodies are flexible, and the behavior of the side wall surface bodies are rigid.

The side walls are connected to the ground using body-ground fixed joint.

The edge of the roof surface body is connected to the side wall using body-body fixed joint.

Two surface bodies of the roof is loaded with uniform pressure.

 

My questions are:

1) There is one warning says, one or more MPC or remote boundary conditions may have conflicts with other applied boundary condition.

2) There is another warning says, two or more remote boundary conditions are sharing a common face, edge, vertex. How can I solve these two warnings. I guess the rigid body connections are not reasonable. But I did not figure out.

3) When I take a look at the total deformation. It looks like the four surface bodies of the roof are separated. They are formed into one part. I thought they should be connected with each other, but they do not. Can anyone give me some suggestions about this? Thank you. Appreciate it.

[peteroznewman]

A) If the side walls are rigid, they can be left out of the model.  Just apply a displacement BC on the outside edges of the roof directly.

You can connect the four inside edges of the four quarters of the roof in several ways. 

• Mesh Connection


• Shared Topology in Geometry editor


• Bonded Contact

[mutianzi1]

 Hello, I leave the four rigid walls in the model is because I will put the structure in a wind field later. The roof will be coupled with the wind field, while the side walls will be treated as rigid. The whole structure is an enclosed structure. This is just a simpler model to test the method. A complex model will be created later on.

Any thoughts on how to achieve this? Thank you.

 

[peteroznewman]

You can leave the rigid walls in, just try the methods in to connect the four quadrants of the roof.

[mutianzi1]

Thanks. Appreciate it.

[mutianzi1]

Hello Peteroznewman,

 

I tried Mesh connection to connect the shells. All the edges of the shells are meshed into 4 elements.

I used Mesh > Mesh Edit > Mesh connection Group. I selected the four pieces of roof surfaces, and detect connections. But the Mesh Edit cannot be generated successfully. Could you please give me some suggestions? Thank you.

 

[mutianzi1]

Hello Peter,

 

I also tried shard topology method in DesignModeler. The setup is shown below.

But the shells still seem separated from each other. Am I doing it right for the shared topology method? Could you give me some suggestions? Thank you.

 

[peteroznewman]

Please reply with a Workbench Project Archive .wbpz file attached so I can try it and report back.

Also say which version of ANSYS you are using.

[mutianzi1]

Hello Peter, I figured out how to solve the problem. Thank you.