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-   -   How to extract an internal volume in star ccm? (http://www.cfd-online.com/Forums/cd-adapco/97062-how-extract-internal-volume-star-ccm.html)

itsme_kit February 8, 2012 06:48

How to extract an internal volume in star ccm?
 
Hi
I want to extract an internal volume for simulation
Can I do it in star ccm?
Thanks

willimanili February 8, 2012 07:16

Yes, you can. There are several ways how you can do this.

One way is to load your geometry either in CAD-modeler or as parts. If your geometry consists of more than one body/part unite them with boolean operation. Because later on you will use the split by surface topolgie operation which can be just operate on one single part. Now assign your bodies to parts if you havent imported your geometry as parts. Launch the surface repair tool and fill all holes which define your internal volume (inlets and outlets). Go back to parts level and execute the split by surface topologie command. If all has been successfull you will now have two parts, the internal volume and your geometry part.

itsme_kit February 8, 2012 07:58

Quote:

Originally Posted by willimanili (Post 343329)
Yes, you can. There are several ways how you can do this.

One way is to load your geometry either in CAD-modeler or as parts. If your geometry consists of more than one body/part unite them with boolean operation. Because later on you will use the split by surface topolgie operation which can be just operate on one single part. Now assign your bodies to parts if you havent imported your geometry as parts. Launch the surface repair tool and fill all holes which define your internal volume (inlets and outlets). Go back to parts level and execute the split by surface topologie command. If all has been successfull you will now have two parts, the internal volume and your geometry part.

Hi willimanili
I still can not do it in right way
Can you help me extract it?

willimanili February 8, 2012 09:19

Where exactly is the problem?

rwryne February 8, 2012 09:46

Quote:

Originally Posted by itsme_kit (Post 343331)
Hi willimanili
I still can not do it in right way
Can you help me extract it?


I assume your part is a solid body an d you are wanting the internal volume of it, lets say just a simple pipe.

1. Import it as a part into STAR.
2. Using the "surface repair tool" (right click the part, repair surface), fill the holes at the inlet and outlet of the pipe.
3. Right click on Mesh Operations and do New->Extract Volume
4. For input parts, select all the parts of the pipe
5. For volume options, change Mode to Surface then for Volume Surfaces, select your inlet surface
6. Select okay, you should have a volume representation now

edit: I am also assuming you are using a recent version of STAR. The mesh operations were added in 6.04 I think

itsme_kit February 8, 2012 12:29

Quote:

Originally Posted by rwryne (Post 343357)
I assume your part is a solid body an d you are wanting the internal volume of it, lets say just a simple pipe.

1. Import it as a part into STAR.
2. Using the "surface repair tool" (right click the part, repair surface), fill the holes at the inlet and outlet of the pipe.
3. Right click on Mesh Operations and do New->Extract Volume
4. For input parts, select all the parts of the pipe
5. For volume options, change Mode to Surface then for Volume Surfaces, select your inlet surface
6. Select okay, you should have a volume representation now

edit: I am also assuming you are using a recent version of STAR. The mesh operations were added in 6.04 I think

Hi rwryne
I think at present I have extracted the internal volume
Is the extracted volume a solid or hollow body?
How can I mesh the extracted volume?
Thanks

rwryne February 8, 2012 12:39

Quote:

Originally Posted by itsme_kit (Post 343411)
Hi rwryne
I think at present I have extracted the internal volume
Is the extracted volume a solid or hollow body?
How can I mesh the extracted volume?
Thanks


When in the geometry phase, all things will be "hollow". Thinking like this is an artifact of using CAD software...in STAR-CCM, everything is a surface until you make a volume mesh.The real way to think of it is that your surfaces in STAR are going to be the boundaries for the volume mesh.

If you have the internal volume extracted then:

(Really broad steps, read the help to get more info on these)
1. Set up your mesh continua
2. Right click your Part, then click Assign Part to Regions , and click New Region.

itsme_kit February 8, 2012 14:58

Quote:

Originally Posted by rwryne (Post 343418)
When in the geometry phase, all things will be "hollow". Thinking like this is an artifact of using CAD software...in STAR-CCM, everything is a surface until you make a volume mesh.The real way to think of it is that your surfaces in STAR are going to be the boundaries for the volume mesh.

If you have the internal volume extracted then:

(Really broad steps, read the help to get more info on these)
1. Set up your mesh continua
2. Right click your Part, then click Assign Part to Regions , and click New Region.

Does it mean the the region I creaded will be a solid body?

rwryne February 8, 2012 15:35

Quote:

Originally Posted by itsme_kit (Post 343438)
Does it mean the the region I creaded will be a solid body?


Again, there really is no "solid body" in the STAR-CCM+ environment. There is a volume mesh, which you create from the regions.

Once you get your regions set, and your mesh continua set up, hit generate volume mesh.

willimanili February 8, 2012 15:52

Read this thread maybe it helps your understanding. Especially the second post from abdul :)

itsme_kit February 16, 2012 11:58

Quote:

Originally Posted by rwryne (Post 343449)
Again, there really is no "solid body" in the STAR-CCM+ environment. There is a volume mesh, which you create from the regions.

Once you get your regions set, and your mesh continua set up, hit generate volume mesh.

so far i can successfully extract the volume from a single part
However, after combining three parts together by using Solidworks, i can't extract the volume

is there something wrong?

rwryne February 16, 2012 14:39

Quote:

Originally Posted by itsme_kit (Post 344792)
so far i can successfully extract the volume from a single part
However, after combining three parts together by using Solidworks, i can't extract the volume

is there something wrong?


A lot can be wrong hoenstly. Maybe your geometry isnt fully connected?

I would suggest doing an "extract volume" on each of the 3 parts individually, then doing a Unite operation in CCM+ to the 3 volumes.

karan75 May 14, 2012 05:21

it can do it in a right way.



karan chananaa.k

karan75 May 14, 2012 05:28

we should load geometry or either in CAD modeler.



chananakaran

karan75 May 14, 2012 05:32

actually I don't have deeply idea about CAD software.




mutthukaran

karan75 May 14, 2012 05:36

New version supports multithread, a visible assembling tool, a graphic management tool, and can support dynamic deployment.



chris karan

karan75 May 14, 2012 05:38

StarCCM 1.0 is an OMG's CORBA Component Model(CCM) implementation in c++ language. This software is developed by StarCCM Team.



tomkaranchan


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