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[ICEM] what is the strategy to block this geometry?

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Old   October 8, 2012, 06:21
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Sijal Ahmed Memon (turboenginner@gmail.com)
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Oh, it is open. In old file there was no extended surface on roof. If there is extended surface then energy382 is suggesting the right approach.
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Old   October 8, 2012, 07:07
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Originally Posted by energy382 View Post
you insert some new geometry, called roofwinwall. what's that?!

nevertheless, it's not a closed surface, so if you want to insert y-block, you've to insert additional surfaces.
Hi energy382, the problem is solved. I need to add six surfaces to enclosed it. Thank you.

Last edited by llrr; October 8, 2012 at 07:28.
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Old   October 8, 2012, 07:50
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Hi energy382, the problem is solved. I need to add six surfaces to enclosed it. Thank you.

No, your blocking is destroyed. Need to do a new one.

You've to improve mesh quality (edge parameters, smoothing etc). Don't have time to do this too.
Attached Files
File Type: zip ph-exercise2-121008.zip (7.3 KB, 5 views)

Last edited by energy382; October 8, 2012 at 10:05.
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Old   October 9, 2012, 02:34
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No, your blocking is destroyed. Need to do a new one.

You've to improve mesh quality (edge parameters, smoothing etc). Don't have time to do this too.
Hi energy382, thank you for the help. I made the new one yesterday and generate relatively good mesh quality. May I ask why the block is destroyed since I have the same steps to operate the block? I also would like to ask if there should not be any single surface (not closed surface) in the geometry? Thanks a lot.
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Old   October 9, 2012, 06:06
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Originally Posted by llrr View Post
Hi energy382, thank you for the help. I made the new one yesterday and generate relatively good mesh quality. May I ask why the block is destroyed since I have the same steps to operate the block? I also would like to ask if there should not be any single surface (not closed surface) in the geometry? Thanks a lot.
Yes, you should always use a closed volume. If there's a non-closed volume in your real geometry, this is always either an inlet, opening or outlet (and therefore, you have to create a new surface)

Even if you have periodic boundaries (e.g. turbine blade passage), you should at least create a part with a single point within, where you project your faces to. Otherwise, ICEM always project edges to closest surface.

Last edited by energy382; October 9, 2012 at 08:46.
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Old   October 10, 2012, 05:54
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Hello All,

I want to do analysis of heat transfer from water flowing through pipes submerged inside concrete. I am modelling in GAMBIT and wish to analyse it on Ansys FLUENT.

Can anybody help me out, how to model and simulate?

Does any tutorials exist?
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Old   October 10, 2012, 10:20
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Originally Posted by energy382 View Post
Yes, you should always use a closed volume. If there's a non-closed volume in your real geometry, this is always either an inlet, opening or outlet (and therefore, you have to create a new surface)

Even if you have periodic boundaries (e.g. turbine blade passage), you should at least create a part with a single point within, where you project your faces to. Otherwise, ICEM always project edges to closest surface.
Hi energy382, thank you for the explaination. After I check the mesh, I got some error information of multiple edges and non-manifold vertices. May I ask what cuases these errors and how should I fix it? Thank you.
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Old   October 10, 2012, 10:28
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did you output mesh to fluent?
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Old   October 11, 2012, 08:02
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Originally Posted by llrr View Post
Hi energy382, thank you for the explaination. After I check the mesh, I got some error information of multiple edges and non-manifold vertices. May I ask what cuases these errors and how should I fix it? Thank you.
I guess, you've forgotten to merge vertices after creating y-grid!?
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Old   October 12, 2012, 03:13
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I guess, you've forgotten to merge vertices after creating y-grid!?
Should I merge the vertex again after creating the y-block? How to do that? Thank you.
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Old   October 12, 2012, 03:14
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did you output mesh to fluent?
Yes, I will output the mesh to Fluent. but what is the relation between the error information and Fluent solver? Thank you.
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Old   October 12, 2012, 03:54
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Originally Posted by energy382 View Post
I guess, you've forgotten to merge vertices after creating y-grid!?
Hi energy382, what I did is:
(1) split the block
(2) merge the vertex
(3) create y-block
(4) generate the mesh

After I create the y-block, should I merge the vertex again? What vertex should I merge? I tried to merge vertex again, but it gives me the information that the vertex is unique. If there is something that I did wrong, please let me know. Thank you.
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Old   October 15, 2012, 09:32
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Originally Posted by llrr View Post
Hi energy382, what I did is:
(1) split the block
(2) merge the vertex
(3) create y-block
(4) generate the mesh

After I create the y-block, should I merge the vertex again? What vertex should I merge? I tried to merge vertex again, but it gives me the information that the vertex is unique. If there is something that I did wrong, please let me know. Thank you.
you've to do two y-blocks right? (right and left side)
you've to merge the vertices, where the two edges (vertical) of the y-blocks match.

compare my blocking with your blocking at this area.
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Old   October 18, 2012, 08:37
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Quote:
Originally Posted by energy382 View Post
you've to do two y-blocks right? (right and left side)
you've to merge the vertices, where the two edges (vertical) of the y-blocks match.

compare my blocking with your blocking at this area.
Hi energy382, I do the two y-blocks at the same time. I tried to merge the vertex where these two y-blocks meet, but it still gives me the information that the vertex is unique? Is it possible that the vertex already merged when I generate the two y-blocks at the same time? Thank you. BTW, I cannot see your block.
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Old   October 18, 2012, 08:48
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Quote:
Originally Posted by energy382 View Post
you've to do two y-blocks right? (right and left side)
you've to merge the vertices, where the two edges (vertical) of the y-blocks match.

compare my blocking with your blocking at this area.
Hi energy382, the problem has been solved. The mesh is fine. I did not merge the vertexs where the two y-block meets (I generated them at the same time, I could not perform the 'merge vertex' operation at all). Thank you for the help.
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