[ICEM] Create different blocks for different bodies

Alam Swift · May 22, 2016, 06:20

The upper region of this model is air, the lower region is water and the object in the air is what I want to drop into water. So I need to mesh the three parts separately as if they are different bodies. But now I can only create one block. I hope that I can create different blocks (At least two, one for the object, and one for the air and water). Could you please tell me how to mesh in ICEM?

Nat Sam · May 23, 2016, 04:45

Hi

I'm far from being an ICEM pro but...
1) You could first start by creating one blocking that covers your whole geometry.
2) Then generate an O-grid 'cause you have a cylinder...
3) Then you can slice it in half so that in the upper half you have the violet part and in the lower part you have the green one.
4) Finally another O-grid in the upper half since you have another cylinder inside...

Hope this helps. Good luck !

bluebase · May 23, 2016, 05:17

Hi Alam,

i think you have two options. It depends on whether you need the mesh on interface surfaces.

If you don't need the interfaces you can just create an additional part and move the respective blocks to that part. (The blocking tab needs to be selected, then, in the add to part options, moving blocks will be available).

The second option is to create subtopologies. Usually there is only a root topology. Check it in the blocking tree. The respective option is found in the context menu.
That way you can create blockings for different regions also with matching interface mesh. I then have to use convert to unstructured for my solvers. I don't know if this works with other "final" meshes, too. Assuming you also need an 'unstructured' mesh for the icem mesh converter, then, you need to select the first subblocking and convert it. Do it sequently with the other two topologies, but remember to use Merge and not Replace for the 2nd, 3rd,.. topology.
That way you obtain a mesh with two matching interface meshes between two blockings.

with regards,
Sebastian

Nat Sam · May 23, 2016, 05:21

Yes Sebastian you're right.
I suggested a second O-grid inside the upper half assuming Alam Swift needs to mesh that inner cylinder too...
And assuming he needed a structured grid. That's what I'm using... Your optionr are probably best suited.

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May 23, 2016, 04:45		#2
Nat Sam New Member Paurnamie Samarakone Join Date: Jun 2015 Posts: 25 Rep Power: 11	Hi I'm far from being an ICEM pro but... 1) You could first start by creating one blocking that covers your whole geometry. 2) Then generate an O-grid 'cause you have a cylinder... 3) Then you can slice it in half so that in the upper half you have the violet part and in the lower part you have the green one. 4) Finally another O-grid in the upper half since you have another cylinder inside... Hope this helps. Good luck !

May 23, 2016, 05:17		#3
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 567 Rep Power: 21	Hi Alam, i think you have two options. It depends on whether you need the mesh on interface surfaces. If you don't need the interfaces you can just create an additional part and move the respective blocks to that part. (The blocking tab needs to be selected, then, in the add to part options, moving blocks will be available). The second option is to create subtopologies. Usually there is only a root topology. Check it in the blocking tree. The respective option is found in the context menu. That way you can create blockings for different regions also with matching interface mesh. I then have to use convert to unstructured for my solvers. I don't know if this works with other "final" meshes, too. Assuming you also need an 'unstructured' mesh for the icem mesh converter, then, you need to select the first subblocking and convert it. Do it sequently with the other two topologies, but remember to use Merge and not Replace for the 2nd, 3rd,.. topology. That way you obtain a mesh with two matching interface meshes between two blockings. with regards, Sebastian

May 23, 2016, 05:21		#4
Nat Sam New Member Paurnamie Samarakone Join Date: Jun 2015 Posts: 25 Rep Power: 11	Yes Sebastian you're right. I suggested a second O-grid inside the upper half assuming Alam Swift needs to mesh that inner cylinder too... And assuming he needed a structured grid. That's what I'm using... Your optionr are probably best suited.