Ansys 17 Pore Pressure Element Type

[jwise]

Hello,

I am trying to run a simulation looking at the geomechanical stresses in shale rock. I want to change the element type so I can account for pore pressure.

I am new to Ansys, and so far I only know I need to change the element type in the command line in the geometry section.

This is what I have put:

et, matid, 216

r,matid,5000000 !(for 5 MPa pore pressure)

This is showing an "unknown error". So I have two questions.

1. Do I need to do this for every node? I have a 5m x 5m x 1m slab of shale I want to simulate.

2. What am I missing in my code? Do I need more parameters?

Any advice or help is greatly appreciated.

 

[scheah]

CPT216 is a 20 node hexahedron element with no real constant. Your real number in your code will be ignored. A few things to look at:
1. Is your model only made of 20 node hexahedron element? It has to be for ET to work.
2. Take a look at the help file here for initial state of pore pressure.

To answer your question:
1. No, it is specified on the element, not nodes.
2. Quite a bit it appears. See pointers above for starting out.

Sorry I'm not much help as I've not dealt much with geomechanics problem before.


Kind regards,
Jason

 

[jwise]

Thank you for your response. That file helps a lot. I will give it a try and see what happens.

Thank you again,

Jarrett