[Solved] POST_RELEVE_T and GROUP_NO

paul18

Hi,

After the simulation (the base has been recorded), i'm trying to extract nodal results (displacements for instance) using POST_RELEVE_T which requires GROUP_NO: how can I explicitely define node numbers (N7 for instance)?

The simulation is performed using Code Aster standalone (not using Salome) and i'm going around in circles without success

Thanks

jacob

Hello, create group of nodes in your mesher, or create group of nodes from group of elements using DEFI_GROUP.

paul18

jacob wrote:
Hello, create group of nodes in your mesher, or create group of nodes from group of elements using DEFI_GROUP.

Hi Jacob

Analysis has ever been performed in a first stage: in other word, the base of results ("glob.1" file) ever exists; furthermore, i'm using Code aster standalone and not Salome in which one can create it (but it need to rerun the complete simulation).

Of course i tried using DEFI_GROUP, but how to explicitely specify (by hand) a node number? each time I've tested something, it fails.

Another solution would be to export results in .med format and post-process it into Paravis (for instance), but in that case, I cannot perform additional calculations into CA (FFT for example).

Paul

paul18

Finally I found a way from an old .comm file

mesh = DEFI_GROUP(reuse=mesh,

CREA_GROUP_NO=_F(NOEUD=('N77', ),

NOM='Tip_N'),

MAILLAGE=mesh)

GROUP_NO has been manually replaced by NOEUD: Note digging into Salome 2022.0.0, i've not found NOEUD option yet in DEFI_GROUP

jacob

Yeah, and creating group can be done like this:

nodeList=[] # empty python list to initialize the BC list

nodeList.append(NOEUD = 'N%d' % (node_ID) )

lIlIl

jacob wrote:
Yeah, and creating group can be done like this:

nodeList=[] # empty python list to initialize the BC list

nodeList.append(NOEUD = 'N%d' % (node_ID) )

I think you meant:

nodeList.append('N%d' % (node_ID) )

For , do you simply write:

POST_RELEVE_T(ACTION=_F(GROUP_NO=(nodeList, ), ...

To add more information on this topic, I tested the following syntaxes and they all work:

grp1 = DEFI_GROUP(reuse=mesh,
                  CREA_GROUP_NO=_F(NOEUD=('N1','N2','N3',), # the last "," is optional
                                   NOM='Tip_N1'),
                  MAILLAGE=mesh)

nodeList = ['N1','N2','N3']
grp2 = DEFI_GROUP(reuse=mesh,
                  CREA_GROUP_NO=_F(NOEUD=nodeList,
                                   NOM='Tip_N2'),
                  MAILLAGE=mesh)

nodeList = ['N1','N2','N3']
grp3 = DEFI_GROUP(reuse=mesh,
                  CREA_GROUP_NO=_F(NOEUD=(nodeList),
                                   NOM='Tip_N3'),
                  MAILLAGE=mesh)

This fails:

nodeList = ['N1','N2','N3']
grp4 = DEFI_GROUP(reuse=mesh,
                  CREA_GROUP_NO=_F(NOEUD=(nodeList,), # Unexpected type: <class 'list'>
                                   NOM='Tip_N4'),
                  MAILLAGE=mesh)