PIPES INTERNAL PRESSURE

[john.kapogiannis]

Dear FEAP-users,

I am trying to assign pressure in the following model, using pressure elements but finally i get the message
"**** SMPAK-ERROR (SDRV): Zero pivot in line    1 ****"

Note that the models consists of break element, created in the cartesian cooridinates system, while the pressure is  applied in  the polar system.
I have attached the input file.
If another way to assign the pressure exists (i.e. direct pressure on element side), please let me know.

Thanks in advance
J. Kapogiannis

[Prof. S. Govindjee]

You have two issues:  (1) It seems that many of your elements are not numbered in the correct order.  Run CHECk to see this (which also performs an auto correction, which you can output using OUTMesh).  (2) Your pressure element is not tied to your pipe.  Coordinates look off or tolerances need to be fixed.

Additional comment, using a single giant pressure element is not going to give you what you want.  The pressure elements need to match the mesh at the same pitch.

[john.kapogiannis]

Thank you professor,

I will fix them both and i will come back!