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-   -   [ICEM] How can I define different zones in ICEM? (http://www.cfd-online.com/Forums/ansys-meshing/68932-how-can-i-define-different-zones-icem.html)

llrr October 6, 2009 16:39

How can I define different zones in ICEM?
 
1 Attachment(s)
Hi, I am trying to model a geometry in attachment. Would you please tell me how I can define the porous media zones in the model? Thank you.

PSYMN October 7, 2009 10:35

Parts...
 
You just need the mesh to be in a different "part" so you can apply different properties.

If it is a 2D mesh, then just change the part of those surfaces (Create a new part and add those surfaces to it).

If it is a 3D mesh, then just create a new material point for each region. Tetra will use a floodfill command to assing the elements in that region to that material part and then you can assign separate material properties to each separate region.

If it is Hexa, still create the material points, but you will need to interactively assign the specific blocks to their specific Material Part...

If you have two separate material regions, ICEM CFD will assume a wall between them... You may need to delete the shell elements between them (or at least set up the bocos on that shell part so it is not a wall). In hexa you can set it up so it won't assume wall projection between specified materials.

Simon

llrr October 7, 2009 13:21

Hi Simon,

Thank you very much for the answer in detail. I have another question in 2D model. Should I have to create surface in 2D model if I use block to generate the mesh? I defined several material regions but after I output the mesh I still only got one zone. I think the problem is maybe that I didn't assign specific blocks accordingly. Please correct me if I am wrong. Thanks a lot.

BTW, I saw the tread about the hybrid mesh and you post a link. unfortunately, I cannot open the link.

Li

PSYMN October 7, 2009 16:45

No surfaces...
 
Ok, so this is a 2D surface blocking with no surfaces... No problem. When you intialized the blocking, it created everything in some material (called FLUID or SOLID or whatever). Create some more material points in the names of your POROUS regions... Then right click on those material points in the tree and choose "Add to Part". The third ICON on the Add to Part DEZ (Data entry zone) is the "Blocking Material, Add Blocks to a Part". Select that, then select the 2D blocks you want to add to the porous parts...

Simon

llrr October 8, 2009 09:33

Hi Simon,

I tried what you said, but when I right click on the material points and chose 'Add to part', I can only click the first icon. The other two are not availabe, I mean, they are in grey. Thank you.

Li

llrr October 8, 2009 09:34

Oh, I got it.

PSYMN October 8, 2009 09:55

Blocking Loaded...
 
Since I am already here, and others may read this...

I am guessing that you just needed to have the blocking loaded so you could access that icon.

I am glad you figured it out.

Best regards,

Simon

llrr October 8, 2009 10:27

Hi Simon,

I did what you suggested in #4. Then I generated the mesh and imported it to Fluent6.3. I got some warnings which are:

//Warning: Thread 3 has 2 contiguous regions.
Warning: Thread 1 has 2 contiguous regions.
creating geom:008-shadow
creating geom:006-shadow
creating geom:004-shadow
creating geom:003-shadow
creating geom:001-shadow
shell conduction zones,
Done.//

On #2, you mentioned if there are two material point or more than two then ICEM will assume a wall between them, but with Hexa mesh I can set it up. I generated the hexa mesh, does it mean the mesh I got is ok? Of course, I mean the connection between porous media zone and the room. Thank you.

llrr October 8, 2009 11:13

1 Attachment(s)
I checked the define/boundary conditions..., and there a lot of new items:

diffusion1-------------------I defined, material point
diffusion2-------------------I defined, material point
drainedfloor-----------------I defined, material point
geom-----------------------ICEM
geom:001-------------------New item, I am gonna define as porous jump
geom:001-shadow-----------New item, I am gonna define as porous jump
geom:002-------------------New item, I am gonna define as the wall, the short edge of the porous media area
geom:003-------------------New item, defined as porous jump
geom:003-shadow-----------New item, defined as porous jump
geom:004-------------------New item, defined as porous jump
geom:004-shadow-----------New item, defined as porous jump
geom:005-------------------New item, defined as porous jump
geom:006-------------------New item, defined as porous jump
geom:006-shadow-----------New item, defined as porous jump
geom:007-------------------New item, defined as wall, the short edge in porous meida area
geom:008-------------------New item, defined as porous jump
geom:008-shadow-----------New item, defined as porous jump
geom:009-------------------New item, defined as wall, short edge in porous media
slattedfloor------------------I defined, material point
ini-diffusion1-----------------New item, defined as porous jump
ini-diffusion2-----------------New item, defined as porous jump
ini-drainedfloor---------------New item, defined as porous jump
ini-slattedfloor---------------New item, defined as porous jump
solid-------------------------ICEM, defined as fluid

I am not sure the patterns like geom:001 and geom:001-shadow, should I define an interface between them in Fluent ( I think I should)? Please also have a look at the attachment. It probably help to understand what I am talking about. Thanks a lot.

Li

PSYMN October 12, 2009 09:40

L8r.
 
Sorry, I am out of time today...:( I will try to get back to this later. But my first thought is that shadows are double walls (the wall and its shadow)... I will look properly at the messages and bocos later.

Simon

llrr October 12, 2009 10:27

Yes, you are right. I think I already figure out how to define them. Some of them are interior and some of them are walls:-) But if I am wrong, please correct me. Thanks.

Li

Fawzy8 February 5, 2013 03:50

I was facing that problem >>>> So thanks much Simon and Li.

Volumeoffluid November 14, 2013 13:06

Quote:

Originally Posted by PSYMN (Post 231807)
Ok, so this is a 2D surface blocking with no surfaces... No problem. When you intialized the blocking, it created everything in some material (called FLUID or SOLID or whatever). Create some more material points in the names of your POROUS regions... Then right click on those material points in the tree and choose "Add to Part". The third ICON on the Add to Part DEZ (Data entry zone) is the "Blocking Material, Add Blocks to a Part". Select that, then select the 2D blocks you want to add to the porous parts...

Simon

Hi,
where exactly can do that??in ansys meshing??
i have 2 fluids and i want to be one the air and water the other.
How can define them before mesh??
Thank you in advance!

hooman.4028 August 4, 2014 20:04

Quote:

Originally Posted by PSYMN (Post 232260)
Sorry, I am out of time today...:( I will try to get back to this later. But my first thought is that shadows are double walls (the wall and its shadow)... I will look properly at the messages and bocos later.

Simon

Dear all,

I have a quick question for you, I have a geometry and only a small region is porous. I do not know how I can define this so when I import it to Fluent I can choose the small part as Porous and the rest just non-porous! Basically how can I have different zones? I do not understand the material point technique, how does Fluent/ICEM understand the exact boundaries of my Porous region? In order to define a body I need two material points, that is what makes me confused. I am trying to use all tetra mesh elements. Your help is greatly appreciated.

Thanks,


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