[itsme_kit]

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

[willimanili]

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]

Originally Posted by willimanili

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]

Where exactly is the problem?

[rwryne]

Originally Posted by itsme_kit

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]

Originally Posted by rwryne

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]

Originally Posted by itsme_kit

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]

Originally Posted by rwryne

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]

Originally Posted by itsme_kit

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]

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

[itsme_kit]

Originally Posted by rwryne

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]

Originally Posted by itsme_kit

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.