change dimensions on an existing mesh

abcdesi · October 14, 2015, 19:04

Absolute newbie to STAR-CCM+
I have a mesh that I've imported into STAR-CCM+. For starters, how do I (see existing dim) and change the dimensions? Help much appreciated

me3840 · October 14, 2015, 19:28

What kind of mesh did you import?

I'm not sure what you mean by see existing dimensions. You can plot a scalar field of position in any direction on your model by simply adding your surface to a scalar scene and picking position as the function.

abcdesi · October 15, 2015, 00:08

Thanks me3840. I'll try that tomorrow since I don't have access now. The mesh file has an extension .ccm and is just a very simple structured (rectangular) mesh. But any ideas on how to change the dimensions? By that I mean let's say the original dimensions of the meshed surface is 2m x 1m. Would I be able to change it to say 3m x 0.5m? If so, how?

me3840 · October 15, 2015, 16:00

You can transform a region by right-clicking it and saying transform > scale

abcdesi · October 15, 2015, 17:09

1. In the mesh that I have loaded, I would like to know the dimensions so that I can use the transform->scale option to make the part/region have the dimensions that I want
2. Using the mesh that I have loaded, I'd like to change the resolution while retaining the same boundary names, etc...

I'm having a hard time doing either of these. I'm now wondering if these can be done at all?

Thanks

me3840 · October 15, 2015, 17:29

1. If you want to know the dimensions of the region, just make minimum and maximum reports for position in x, y, and z. That will tell you the bounding box of the mesh.

2. I'm not sure what you mean by change resolution. Do you mean you want to remesh it? If so you need to extract the boundary surfaces, import that surface as a part, and mesh it like normal. But the sizes of the initial surface will be retained, so you cannot get a finer boundary surface than you already have.

abcdesi · October 15, 2015, 18:02

Thanks me3840. That is exactly what I want to do: rescale and remesh. Was able to rescale following what you said. After that I selected File-> Export and chose the boundaries and saved it in .ccm format. Then I imported it, but seem to have not gotten anything back So, can you please elaborate on the export and remesh procedure. Sorry, as I mentioned I'm a total newbie...

me3840 · October 15, 2015, 20:26

If you already have a volume mesh imported, this is the procedure to extract a surface of the mesh:

Go to the bottom of the tree and find representations>volume mesh>right click> extract boundary surface
That will make an extracted surface representation. You can right-click that and export it as a .dbs file. Import that and mesh as normal.

October 14, 2015, 19:04	change dimensions on an existing mesh	#1
abcdesi New Member Join Date: Oct 2015 Posts: 4 Rep Power: 10	Absolute newbie to STAR-CCM+ I have a mesh that I've imported into STAR-CCM+. For starters, how do I (see existing dim) and change the dimensions? Help much appreciated

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October 14, 2015, 19:28		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	What kind of mesh did you import? I'm not sure what you mean by see existing dimensions. You can plot a scalar field of position in any direction on your model by simply adding your surface to a scalar scene and picking position as the function.

October 15, 2015, 00:08		#3
abcdesi New Member Join Date: Oct 2015 Posts: 4 Rep Power: 10	Thanks me3840. I'll try that tomorrow since I don't have access now. The mesh file has an extension .ccm and is just a very simple structured (rectangular) mesh. But any ideas on how to change the dimensions? By that I mean let's say the original dimensions of the meshed surface is 2m x 1m. Would I be able to change it to say 3m x 0.5m? If so, how?

October 15, 2015, 16:00		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	You can transform a region by right-clicking it and saying transform > scale

October 15, 2015, 17:09		#5
abcdesi New Member Join Date: Oct 2015 Posts: 4 Rep Power: 10	1. In the mesh that I have loaded, I would like to know the dimensions so that I can use the transform->scale option to make the part/region have the dimensions that I want 2. Using the mesh that I have loaded, I'd like to change the resolution while retaining the same boundary names, etc... I'm having a hard time doing either of these. I'm now wondering if these can be done at all? Thanks

October 15, 2015, 17:29		#6
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	1. If you want to know the dimensions of the region, just make minimum and maximum reports for position in x, y, and z. That will tell you the bounding box of the mesh. 2. I'm not sure what you mean by change resolution. Do you mean you want to remesh it? If so you need to extract the boundary surfaces, import that surface as a part, and mesh it like normal. But the sizes of the initial surface will be retained, so you cannot get a finer boundary surface than you already have.

October 15, 2015, 18:02		#7
abcdesi New Member Join Date: Oct 2015 Posts: 4 Rep Power: 10	Thanks me3840. That is exactly what I want to do: rescale and remesh. Was able to rescale following what you said. After that I selected File-> Export and chose the boundaries and saved it in .ccm format. Then I imported it, but seem to have not gotten anything back So, can you please elaborate on the export and remesh procedure. Sorry, as I mentioned I'm a total newbie...

October 15, 2015, 20:26		#8
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	If you already have a volume mesh imported, this is the procedure to extract a surface of the mesh: Go to the bottom of the tree and find representations>volume mesh>right click> extract boundary surface That will make an extracted surface representation. You can right-click that and export it as a .dbs file. Import that and mesh as normal.