The CONEC matrix contains nodal values. It is structured as follows:
CONEC(INP, ISPAC, ICONE) where:
The nodal value defined by ICONE depends on the type of analysis. In the following paragraph, index $0$ indicates the beginning of the time step, and index $1$ indicates the end of the time step.
1. Static analysis
| ICONE | Nodal value |
|---|---|
| 1 | $X_1$ |
| 2 | $X_0$ |
| 3 | $\dot{X}_0$ |
| 4 | $DX$ if IMDIS=1 |
2. Dynamic analysis
| ICONE | Nodal value |
|---|---|
| 1 | $X_1$ |
| 2 | $X_0$ |
| 3 | $\dot{X}_0$ |
| 4 | $\ddot{X}_0$ |
| 5 | $\dot{X}_1$ (first approximation, used for damping) |
| 6 | $DX$ if IMDIS=1 |
For instance, in the case of a 2D static coupled mechanical water-thermal-air flow analysis (NTANA=5), the value of the nodal speed (ICONE=3) in the Y-direction (ISPAC=2) at node 1 (INP=1) is found in CONEC(1,2,3). Assuming the studied structure has a total of NUMNP=100 nodes and IMDIS=0, the dimensions of the CONEC matrix are CONEC(100, 5, 3).
The corresponding value of IPCON for *.ipn or *.ipc files is then:
ipcon=(icone-1)*nspac+ispac=(3-1)*5+2=12
SIGVA contains the values of variables at integration points. The structure of SIGVA is the following:
Order: