how to define an analytical rigid surface for the ground model

[mohtech]

Hi,
I want to model the contact reaction between a pipeline and the seabed. I used only one part in which I defined the pipeline.
for the ground model, I wanted to use an analytical rigid surface, but I don't know at which level of the .inp file I should insert the following command lines for the analytical rigid surface definition.
----------------------
*node
12345, 0, -240, 0
*SURFACE,TYPE=CYLINDER,NAME=seabed
0 , 0, 0, 0 , 0 , -1
1 , 0 , 0
start, -500, -240
line, 500, -240
*rigid body, analytical surface=seabed ,ref node=12345
-------------------------------------------
I tried to insert those command lines just after the line (*end instance) for the part instance I created for the pipeline but I had the following error message :
----------------------------------
When the *SURFACE option is used to define an analytical surface,
it can only appear within a part (or part instance) definition, even
if the rigid body is defined at the assembly level.
-----------------------------------
Do I have to create another part for the ground to resolve this problem?
Thanks in advance

 

[Mustaine3]

Yes, the rigid is also a part and has to be added similar to the deformable part, so with the part and instance command.

 

[mohtech]

Ok thank you!