Don't have much idea with Simulation but here is what I have found from SW Help files:
Virtual Wall. Available for static studies only. This contact type defines contact between the Set 1 entities and a virtual wall defined by a target plane. The target plane may be rigid or flexible. You can define friction between the Set 1 entities and the target plane by assigning a non-zero value for the friction coefficient.
So simply create a plane and select that as virtual wall.
Ok I found the answer for those that are looking for it too.
To set a virtual wall;
In the Simulation feature tree - Right click on "Connections"
Select "Contact sets"
In the drop down menu select "Virtual Wall"
Select the part of the object that is to be in contact with the plane that you want to make virtual.
Select the plane.
If you need, you can define a gap. And have the option to define it as "Rigid" or "Flexible" and set the friction.
Then the virtual wall will appear in the "Fixtures" tab in the simulation feature tree.
Hope this helps someone.
Probably worth starting a new thread and posting your file.
I have followed the instructions outlined above and have a virtual wall listed under my "Fixtures" on the study tree, but when I select the foundation bolt I still am getting the message:
"Rigid Virtual wall contact must be defined for foundation bolt"
Am I missing something obvious? The underside of my model sits on the ground which I then hoped to use the foundation bolts on.
* Edit *
It now works!
is it elastic or rigid? can you show the definition of your virtual wall?
can you please give the example for flexible virtaul wall.