Error 6523 - Negative basic x coordinate (GRID 3) is illegal (Axisymmetric analysis)

Wesley Peijnenburg

 

In a 2D axisymmetric analysis I get the following error: "Error 6523 - Negative basic x coordinate (GRID 3) is illegal". But no geometry is defined in negative X in my model. 

 

What could be the cause, and how to solve that?

 

Tutorial OS-T 1394 was used for comparison; if I use the initial file "Ball_Joint_2D_Axisymmetry.hm" then everything is fine but if I start from scratch, this error keeps popping up? So it looks like I missed something. I tried both the XY and XZ system.

 

PaulAltair

As the original error states, GRID 3 has a negative X value (albeit a very very small one of -8.6e-17), if I make that 0.0, the model is able to run

PaulAltair

What are the coordinates of GRID 3? can you share your model?

Wesley Peijnenburg

Paul Sharp_21301 said:

What are the coordinates of GRID 3? can you share your model?

Yes, see attached:

- The model from OS-T 1394 (works fine) and,

- The model of a sphere against a wall which I'm currently working on

PaulAltair

As the original error states, GRID 3 has a negative X value (albeit a very very small one of -8.6e-17), if I make that 0.0, the model is able to run

Wesley Peijnenburg

Paul Sharp_21301 said:

As the original error states, GRID 3 has a negative X value (albeit a very very small one of -8.6e-17), if I make that 0.0, the model is able to run

Indeed, thank you!

Wesley Peijnenburg

 

For anyone with the same error: Paul Sharp's solution could be automated with the below TCL code for this model. 

 

# Loop over node coordinates and correct X<0 if needed:
*createmark nodes 1 "all"
foreach {nid} [hm_getmark nodes 1] {
    set coord_x [hm_getvalue nodes id=$nid dataname=x]
    set coord_y [hm_getvalue nodes id=$nid dataname=y]
    set coord_z [hm_getvalue nodes id=$nid dataname=z]

    if {$coord_x < 0} then {
      *setvalue nodes id=$nid localcoordinates={0 $coord_y $coord_z}
    }
}