i make model in unsaturated expansive soil with coupled pore fluid and stress analysis. in manual the part is created by orphan mesh feature how can i do this and why?
There is no strict requirement for any analysis to have orphan mesh. If you can create a model and mesh it in ABAQUS/cae that will also work.
Orphan mesh is something which has only element and node information. It does not have any thing like part, lines or areas or cells, which are there in a general model created by ABAQUS/cae. There are several way you can create orphan mesh.
1. If you have a odb file from earlier analysis you can import it in ABAQUS, it will create an Orphan mesh.
2. If you have the mesh information from some where else (say from other meshing software), then just write the nodal coordinates and element connectivity (in proper format) in the input file (*.inp) and then import it in ABAQUS. Then also you will get orphan mesh.
Hope this helps.
Orphan meshes are only required if you cannot mesh in abaqus cae itself. If you can, then always go for the latter option, since you can define surfaces, sets etc very easily. Also you can make use of surface to surface contact, if your problem has contact requirements.
Orphan meshes are generally required if you have a complicated part which cannot be meshed in abaqus, or if you want to import the deformed mesh of another simulation. In such cases, import your orphan mesh by going to file>import>model and choosing your inp file.
Can I change the dimensions in Abaqus after importing the model (.inp file) ?
Because there is an orphan mesh. It cannot allow to edit dimensions ( length , width). After changing the dimensions I want to change the mesh and element type. Is this possible? If any one knows please help me.
I would also like to ask, whether it is possible to change somehow the orphan mesh.
So far I have computed the nodal coordinates of a beam in Matlab in order to create a helix. But after importing the .inp file into Abaqus, the program says, that part contains no geometry.
"No geometry" means that there are no geometric features attached to your mesh (since you did not draw it with CAE). You can still edit the mesh, there are some options for that.
Rajesh Meena Olena Shkadron
In order to convert an orphan mesh part to a geometry, you need to export the orphan mesh model as an STL file (Plug-ins ---> Tools ---> STL Export), then using any CAD software to convert it into a STEP or IGS file and then importing it again to Abaqus.
I used this method for an orphan mesh part comprises several components and it worked very well.
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