[mesh manipulation] Converting a 2Dmesh to axisymmetric

gschaider · January 14, 2009, 07:07

Go to
http://openfoam-extend.svn.sourceforge.net/viewvc/openfoam-extend/trunk/Breeder_ 1.5/utilities/mesh/manipulation/MakeAxialMesh/
and click on "Download GNU Traball"

Bernhard

mahendra · January 15, 2009, 06:14

Dear Bernhard,

Thanks for the makeAxialMesh Utility. I am now able to make a axial mesh in OpenFOAM-1.5.

mahendra · January 17, 2009, 08:54

Dear Bernhard !

One quick question, how to specify axis to a grid?

mahendra · January 19, 2009, 00:50

Dear Bernhard,

I am not able to use collapseEdges utility, It is giving me segmentation fault....

Can u shed some light on this?

Regards,
Mahendra

mahendra · January 19, 2009, 01:26

The error i am getting is like this:

Cell:14998 uses faces:6(29649 30248 60346 60347 29349 29648) of which too many are marked for remov
al:
29649 30248 60346 60347 29349 29648
Cell:14999 uses faces:6(30249 30299 60348 60349 29350 29649) of which too many are marked for remov
al:
30249 30299 60348 60349 29350 29649
Morphing ...
--> FOAM Warning :
From function boundBox::boundBox(const pointField& points)
in file meshes/boundBox/boundBox.C at line 52
Cannot find bounding box for zero sized pointField, returning zero
--> FOAM Warning :
From function boundBox::boundBox(const pointField& points)
in file meshes/boundBox/boundBox.C at line 52
Cannot find bounding box for zero sized pointField, returning zero
Collapsing 0 small edges
Collapsing 0 in line edges
#0 Foam::error::printStack(Foam:

stream&) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOp t/libOpenFOAM.so"
#1 Foam::sigSegv::sigSegvHandler(int) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/lib OpenFOAM.so"
#2 ?? in "/lib64/libc.so.6"
#3 collapseHighAspectFaces(Foam::polyMesh const&, Foam::PackedList<1> const&, double, double, Foam ::edgeCollapser&) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/collapseEdg es"
#4 main in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/collapseEdges "
#5 __libc_start_main in "/lib64/libc.so.6"
#6 __gxx_personality_v0 in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/coll apseEdges"
Segmentation fault
lcfd@clust5:~/OpenFOAM/lcfd-1.5/Mahendra/Pipe_trial>

Regards,
Mahendra

gschaider · January 19, 2009, 11:31

Hi Mahendra!

The axis is defined using the axis-option (it assumes that you have a planar patch of that name). With the offset-option you can move the axis away from that line. I'm not sure what happens if the patch is not planar

@the collapseEdge-crash: no idea. At first try to run checkMesh on your original (axial) mesh to see whether it is valid. It seems to me that the utilitiy is trying to remove too many edges. Decrease the tolerance parameter (what value are you using now?)

Bernhard

mahendra · January 20, 2009, 01:53

Dear Bernhard,

I am using a edge length as 3m and angle as 5 degree, what i found was when I used edge length as 0.001m, the collapseEdges utility worked fine saying that 0 edges and 0 faces modified.

I assumed that since my pipe length is 3m and wedge angle is 5 degrees I should use them while specifying the arguments to collapseEdges utilty and it resulted in segmentation fault.

Was I correct in using it or not???

Regards,
Mahendra

gschaider · January 20, 2009, 12:12

Hi Mahendra!

The first parameter means "all edges shorter that this will be removed". Which would mean almost all edges. Vary the feature angle

Bernhard

sega · January 20, 2009, 15:27

Hello!

I have just learned that my meshes created with makeAxialMesh are not 1 cell but 5 cells thick (in the wedge direction).

Did I do something wrong?
Do you have any idea what may be the problem?

Greetings.
Sebastian.

gschaider · January 21, 2009, 15:33

Hi Sebastian!

Have you checked the original (2D planar) mesh? This shouldn't happen unless the original is that thick, too

Bernhard

sega · January 21, 2009, 16:10

Yes I did.

The mesh is just fine in both 2D and wedge.
Due to the big amount of cells and their small size this was just my mistake in seeing them correctly.

Sorry.

olwi · January 21, 2009, 16:34

Mahendra: Please have a look at my post of September 9, 2008: http://www.cfd-online.com/OpenFOAM_D.../126/9114.html

I think your problem is in large differences in sizes of cells/faces in your mesh. Try the modified "collapseEdgesBetter" in my post. Use the option -areaFactor to specify an "areafactor" smaller than the default 1e-9. Maybe 1e-11?

/Ola

sega · January 21, 2009, 17:07

No, that is not the problem.
I was just too blind to see them correctly.
But thanks for your advice.!

mahendra · January 21, 2009, 23:48

Hi Bernhard,
Still I am getting the segmentation fault error with using collapseEdgesBetter.

Cell:49999 uses faces:6(100949 100999 201048 201049 97950 98949) of which too many are marked for removal:
100949 100999 201048 201049 97950 98949
Morphing ...
--> FOAM Warning :
From function boundBox::boundBox(const pointField& points)
in file meshes/boundBox/boundBox.C at line 52
Cannot find bounding box for zero sized pointField, returning zero
--> FOAM Warning :
From function boundBox::boundBox(const pointField& points)
in file meshes/boundBox/boundBox.C at line 52
Cannot find bounding box for zero sized pointField, returning zero
Collapsing 0 small edges
Collapsing 0 in line edges
#0 Foam::error::printStack(Foam:

stream&) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libOpenFOAM.so"
#1 Foam::sigSegv::sigSegvHandler(int) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libOpenFOAM.so"
#2 ?? in "/lib64/libc.so.6"
#3 collapseHighAspectFaces(Foam::polyMesh const&, Foam::PackedList<1> const&, double, double, Foam::edgeCollapser&) in "/home/lcfd/OpenFOAM/lcfd-1.5/applications/bin/linux64GccDPOpt/collapseEdgesBett er"
#4 main in "/home/lcfd/OpenFOAM/lcfd-1.5/applications/bin/linux64GccDPOpt/collapseEdgesBett er"
#5 __libc_start_main in "/lib64/libc.so.6"
#6 __gxx_personality_v0 in "/home/lcfd/OpenFOAM/lcfd-1.5/applications/bin/linux64GccDPOpt/collapseEdgesBett er"
Segmentation fault
lcfd@clust5:~/OpenFOAM/lcfd-1.5/Mahendra/Pipe_2D>

Regards,
Mahendra

gschaider · January 22, 2009, 10:23

Hi Mahendra!

Try skipping the collapseEdges-Stuff. Simply set all scalars to zeroGradient and the vectors to slip on the axis-patch (I think that are the settings that work) and try to use the mesh that way

Bernhard

squadron · February 6, 2009, 05:35

Hi,

I have created a 3D mesh with Gmsh, 1 element thick, and used gmshToFoam to convert it. checkMesh gave an "OK"

Now I want to use makeAxialMesh to convert my mesh into an axi-symmetrical one. This was the result:

Create time

Create mesh for time = 0

Plane of the grid: (0 0 1) (0.105253 0.0174027 0.0005)

The rotation-axis: ((-0.06 0 0.0005) (0.94 0 0.0005))

Creating wedge with an opening angel of 5 degrees

Radius to axis: min = 1.0842e-19 max 0.05
#0 Foam::error::printStack(Foam:

stream&) in "/home/age/OpenFoam/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so"
#1 Foam::sigSegv::sigSegvHandler(int) in "/home/age/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so"
#2 Uninterpreted: [0xb7ff3400]
#3 getDistance(Foam::polyPatch const&, Foam::line<foam::vector<double>, Foam::Vector<double> >&) in "/home/age/OpenFOAM/age-1.5/applications/bin/linuxGccDPOpt/makeAxialMesh"
#4 main in "/home/age/OpenFOAM/age-1.5/applications/bin/linuxGccDPOpt/makeAxialMesh"
#5 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"
#6 _start in "/home/age/OpenFOAM/age-1.5/applications/bin/linuxGccDPOpt/makeAxialMesh"
Segmentation fault

What did I do wrong?

FYI, I'm not only an OpenFoam newby, but also a Linux newby, so please explain the whole process step by step.

elorriaux · February 6, 2009, 08:30

Hello,

i suppose you have followed the wiki instructions and checked the different constraints : http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh

As you have already your model in gmsh, you can directly revolve your mesh in gmsh :

- rotate -2.5° your plane from your main 2D plane
- extrude (revolve) 5°
- save mesh
- gmshToFoam

I've already done that with gmsh, it works fine.

You can also have another solution by revolving your mesh in OpenFoam with the extrudeMesh tool, but it's not the easier way to do, i think.

Good luck.

gschaider · February 6, 2009, 08:35

Hi Age!

No idea (havn't seen that stacktrace). How big is the mesh? Could you pass the mesh to me and I'll have a look

Bernhard

squadron · February 6, 2009, 09:49

@ Etienne:
So you don't use makeAxialMesh at all? Just extrude using rotation in Gmsh?

@ Bernhard:
The mesh-file is very large. I will try some other things first, like simple geo's etc.

Thanks guys

elorriaux · February 6, 2009, 10:52

It depends on the case, if my geometry is done in gmsh, i revolve the mesh in gmsh. If i already have a mesh in gambit or a blockMeshDict, i use makeAxialMesh.

All those procedures should work, i've tried successfully many different ways to build axy cases in OpenFOAM.

If your msh file is too large, perhaps you can zip the .geo, it should be easier to transfer.

January 14, 2009, 07:07	Go to http://openfoam-extend.	#21
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Go to http://openfoam-extend.svn.sourceforge.net/viewvc/openfoam-extend/trunk/Breeder_ 1.5/utilities/mesh/manipulation/MakeAxialMesh/ and click on "Download GNU Traball" Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

January 15, 2009, 06:14	Dear Bernhard, Thanks for t	#22
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	Dear Bernhard, Thanks for the makeAxialMesh Utility. I am now able to make a axial mesh in OpenFOAM-1.5.

January 17, 2009, 08:54	Dear Bernhard ! One quick q	#23
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	Dear Bernhard ! One quick question, how to specify axis to a grid?

January 19, 2009, 00:50	Dear Bernhard, I am not abl	#24
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	Dear Bernhard, I am not able to use collapseEdges utility, It is giving me segmentation fault.... Can u shed some light on this? Regards, Mahendra

January 19, 2009, 01:26	The error i am getting is like	#25
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	The error i am getting is like this: Cell:14998 uses faces:6(29649 30248 60346 60347 29349 29648) of which too many are marked for remov al: 29649 30248 60346 60347 29349 29648 Cell:14999 uses faces:6(30249 30299 60348 60349 29350 29649) of which too many are marked for remov al: 30249 30299 60348 60349 29350 29649 Morphing ... --> FOAM Warning : From function boundBox::boundBox(const pointField& points) in file meshes/boundBox/boundBox.C at line 52 Cannot find bounding box for zero sized pointField, returning zero --> FOAM Warning : From function boundBox::boundBox(const pointField& points) in file meshes/boundBox/boundBox.C at line 52 Cannot find bounding box for zero sized pointField, returning zero Collapsing 0 small edges Collapsing 0 in line edges #0 Foam::error::printStack(Foam:stream&) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOp t/libOpenFOAM.so" #1 Foam::sigSegv::sigSegvHandler(int) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/lib OpenFOAM.so" #2 ?? in "/lib64/libc.so.6" #3 collapseHighAspectFaces(Foam::polyMesh const&, Foam::PackedList<1> const&, double, double, Foam ::edgeCollapser&) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/collapseEdg es" #4 main in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/collapseEdges " #5 __libc_start_main in "/lib64/libc.so.6" #6 __gxx_personality_v0 in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/applications/bin/linux64GccDPOpt/coll apseEdges" Segmentation fault lcfd@clust5:~/OpenFOAM/lcfd-1.5/Mahendra/Pipe_trial> Regards, Mahendra

January 19, 2009, 11:31	Hi Mahendra! The axis is de	#26
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Hi Mahendra! The axis is defined using the axis-option (it assumes that you have a planar patch of that name). With the offset-option you can move the axis away from that line. I'm not sure what happens if the patch is not planar @the collapseEdge-crash: no idea. At first try to run checkMesh on your original (axial) mesh to see whether it is valid. It seems to me that the utilitiy is trying to remove too many edges. Decrease the tolerance parameter (what value are you using now?) Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

January 20, 2009, 01:53	Dear Bernhard, I am using a	#27
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	Dear Bernhard, I am using a edge length as 3m and angle as 5 degree, what i found was when I used edge length as 0.001m, the collapseEdges utility worked fine saying that 0 edges and 0 faces modified. I assumed that since my pipe length is 3m and wedge angle is 5 degrees I should use them while specifying the arguments to collapseEdges utilty and it resulted in segmentation fault. Was I correct in using it or not??? Regards, Mahendra

January 20, 2009, 12:12	Hi Mahendra! The first para	#28
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Hi Mahendra! The first parameter means "all edges shorter that this will be removed". Which would mean almost all edges. Vary the feature angle Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

January 20, 2009, 15:27	Hello! I have just learned	#29
sega Senior Member Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 20	Hello! I have just learned that my meshes created with makeAxialMesh are not 1 cell but 5 cells thick (in the wedge direction). Did I do something wrong? Do you have any idea what may be the problem? Greetings. Sebastian. __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

January 21, 2009, 15:33	Hi Sebastian! Have you chec	#30
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Hi Sebastian! Have you checked the original (2D planar) mesh? This shouldn't happen unless the original is that thick, too Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

January 21, 2009, 16:10	Yes I did. The mesh is just	#31
sega Senior Member Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 20	Yes I did. The mesh is just fine in both 2D and wedge. Due to the big amount of cells and their small size this was just my mistake in seeing them correctly. Sorry. __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

January 21, 2009, 16:34	Mahendra: Please have a look a	#32
olwi Member Ola Widlund Join Date: Mar 2009 Location: Sweden Posts: 87 Rep Power: 17	Mahendra: Please have a look at my post of September 9, 2008: http://www.cfd-online.com/OpenFOAM_D.../126/9114.html I think your problem is in large differences in sizes of cells/faces in your mesh. Try the modified "collapseEdgesBetter" in my post. Use the option -areaFactor to specify an "areafactor" smaller than the default 1e-9. Maybe 1e-11? /Ola

January 21, 2009, 17:07	No, that is not the problem.	#33
sega Senior Member Sebastian Gatzka Join Date: Mar 2009 Location: Frankfurt, Germany Posts: 729 Rep Power: 20	No, that is not the problem. I was just too blind to see them correctly. But thanks for your advice.! __________________ Schrödingers wife: "What did you do to the cat? It's half dead!"

January 21, 2009, 23:48	Hi Bernhard, Still I am getti	#34
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	Hi Bernhard, Still I am getting the segmentation fault error with using collapseEdgesBetter. Cell:49999 uses faces:6(100949 100999 201048 201049 97950 98949) of which too many are marked for removal: 100949 100999 201048 201049 97950 98949 Morphing ... --> FOAM Warning : From function boundBox::boundBox(const pointField& points) in file meshes/boundBox/boundBox.C at line 52 Cannot find bounding box for zero sized pointField, returning zero --> FOAM Warning : From function boundBox::boundBox(const pointField& points) in file meshes/boundBox/boundBox.C at line 52 Cannot find bounding box for zero sized pointField, returning zero Collapsing 0 small edges Collapsing 0 in line edges #0 Foam::error::printStack(Foam:stream&) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libOpenFOAM.so" #1 Foam::sigSegv::sigSegvHandler(int) in "/home/lcfd/OpenFOAM/OpenFOAM-1.5/lib/linux64GccDPOpt/libOpenFOAM.so" #2 ?? in "/lib64/libc.so.6" #3 collapseHighAspectFaces(Foam::polyMesh const&, Foam::PackedList<1> const&, double, double, Foam::edgeCollapser&) in "/home/lcfd/OpenFOAM/lcfd-1.5/applications/bin/linux64GccDPOpt/collapseEdgesBett er" #4 main in "/home/lcfd/OpenFOAM/lcfd-1.5/applications/bin/linux64GccDPOpt/collapseEdgesBett er" #5 __libc_start_main in "/lib64/libc.so.6" #6 __gxx_personality_v0 in "/home/lcfd/OpenFOAM/lcfd-1.5/applications/bin/linux64GccDPOpt/collapseEdgesBett er" Segmentation fault lcfd@clust5:~/OpenFOAM/lcfd-1.5/Mahendra/Pipe_2D> Regards, Mahendra

January 22, 2009, 10:23	Hi Mahendra! Try skipping t	#35
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Hi Mahendra! Try skipping the collapseEdges-Stuff. Simply set all scalars to zeroGradient and the vectors to slip on the axis-patch (I think that are the settings that work) and try to use the mesh that way Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

February 6, 2009, 05:35	Hi, I have created a 3D mes	#36
squadron New Member Age Nammensma Join Date: Mar 2009 Posts: 10 Rep Power: 17	Hi, I have created a 3D mesh with Gmsh, 1 element thick, and used gmshToFoam to convert it. checkMesh gave an "OK" Now I want to use makeAxialMesh to convert my mesh into an axi-symmetrical one. This was the result: Create time Create mesh for time = 0 Plane of the grid: (0 0 1) (0.105253 0.0174027 0.0005) The rotation-axis: ((-0.06 0 0.0005) (0.94 0 0.0005)) Creating wedge with an opening angel of 5 degrees Radius to axis: min = 1.0842e-19 max 0.05 #0 Foam::error::printStack(Foam:stream&) in "/home/age/OpenFoam/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #1 Foam::sigSegv::sigSegvHandler(int) in "/home/age/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #2 Uninterpreted: [0xb7ff3400] #3 getDistance(Foam::polyPatch const&, Foam::line<foam::vector<double>, Foam::Vector<double> >&) in "/home/age/OpenFOAM/age-1.5/applications/bin/linuxGccDPOpt/makeAxialMesh" #4 main in "/home/age/OpenFOAM/age-1.5/applications/bin/linuxGccDPOpt/makeAxialMesh" #5 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6" #6 _start in "/home/age/OpenFOAM/age-1.5/applications/bin/linuxGccDPOpt/makeAxialMesh" Segmentation fault What did I do wrong? FYI, I'm not only an OpenFoam newby, but also a Linux newby, so please explain the whole process step by step.

February 6, 2009, 08:30	Hello, i suppose you have f	#37
elorriaux Member Etienne Lorriaux Join Date: Mar 2009 Location: Compiegne, France Posts: 45 Rep Power: 17	Hello, i suppose you have followed the wiki instructions and checked the different constraints : http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh As you have already your model in gmsh, you can directly revolve your mesh in gmsh : - rotate -2.5° your plane from your main 2D plane - extrude (revolve) 5° - save mesh - gmshToFoam I've already done that with gmsh, it works fine. You can also have another solution by revolving your mesh in OpenFoam with the extrudeMesh tool, but it's not the easier way to do, i think. Good luck. Hisham likes this.

February 6, 2009, 08:35	Hi Age! No idea (havn't see	#38
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Hi Age! No idea (havn't seen that stacktrace). How big is the mesh? Could you pass the mesh to me and I'll have a look Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

February 6, 2009, 09:49	@ Etienne: So you don't use m	#39
squadron New Member Age Nammensma Join Date: Mar 2009 Posts: 10 Rep Power: 17	@ Etienne: So you don't use makeAxialMesh at all? Just extrude using rotation in Gmsh? @ Bernhard: The mesh-file is very large. I will try some other things first, like simple geo's etc. Thanks guys

February 6, 2009, 10:52	It depends on the case, if my	#40
elorriaux Member Etienne Lorriaux Join Date: Mar 2009 Location: Compiegne, France Posts: 45 Rep Power: 17	It depends on the case, if my geometry is done in gmsh, i revolve the mesh in gmsh. If i already have a mesh in gambit or a blockMeshDict, i use makeAxialMesh. All those procedures should work, i've tried successfully many different ways to build axy cases in OpenFOAM. If your msh file is too large, perhaps you can zip the .geo, it should be easier to transfer.

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