[Far]

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.

[llrr]

Originally Posted by energy382

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.

[energy382]

Originally Posted by llrr

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.

[llrr]

Originally Posted by energy382

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.

[energy382]

Originally Posted by llrr

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.

[nkme2007]

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?

[llrr]

Originally Posted by energy382

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.

[Far]

did you output mesh to fluent?

[energy382]

Originally Posted by llrr

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!?

[llrr]

Originally Posted by energy382

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.

[llrr]

Originally Posted by Far

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.

[llrr]

Originally Posted by energy382

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.

[energy382]

Originally Posted by llrr

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.

[llrr]

Originally Posted by energy382

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.

[llrr]

Originally Posted by energy382

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.