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[lightyagami]

I have created a geometry of Spiral plate heat exchanger. I have tried to mesh it as shown in below image but I can't figure out how to do it. Can anyone suggest some ways to do it ?

This is how I want my mesh to look

This is how geometry looks.

This is two dimensional image, the whole assembly is three dimensional. Any suggestion would be helpful.

Here is the geometry link :

GEOMETRY FILE

 

[peteroznewman]

Here is a 3D spiral along an axis.

[lightyagami]

Sweep method is not showing all four spirals for available bodies to sweep, only two.

[lightyagami]

I have created all the four bodies mesh with the sweep method but in inner spirals I am not getting uniform mesh and maximum skewness is around 0.94

[Rob]

You've got one cell across each section, so the flow solver is going to fail.  It also looks like the mesh is struggling to match across the channel, try breaking this into quarters and see if that helps. 

As an aside, have a look through the older posts: someone's posted this problem before. 

[lightyagami]

I have divide spiral into quarters and have gotten satisfactory results

Now my geometry is 3D 

Whenever try to mesh the geometry horizontally I am not getting node merge between some plates as shown by marks

and whenever I try to divide the spiral the whole mesh looks like this

Any Idea why am I getting this kind of mesh ?

[lightyagami]

Also I have specified named selection but Fluent is converting my outlet named surface into interface zone. Also is there any way to assign system coupling option to all wall simultaneously in ansys fluent ?

 

 

[Rob]

The node alignment problem could be pixelation of the image: are they really not connected? In the last image it looks like you've not done any share topology actions. 

Not sure why it's changing an outlet (named) into an interface. Check for contact regions, also what's the full name you used in the named selection?

[lightyagami]

I have used shared topology option but I am still getting mesh like this :

And I have already figured out outlet boundary condition issue.

[Keyur Kanade]

For those zig zag elements, you will have slice the body at different locations. Then you will have to use same edge sizing for parallel edges. 

For some regions, nodes do not look like connected. You have to use share topology in DM or SpaceClaim. Also you need to have a single part for the bodies, you want to have conformal mesh. 

https://www.youtube.com/watch?v=IO4ZtwZdD2I

Regards,

Keyur

 

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[lightyagami]

I have already used share topology option and divided plates in quarters.

[Keyur Kanade]

But there are 4 parts. If you want conformal mesh for all bodies, please use single part. 

Also use edge sizing in meshing. 

Regards,

Keyur

 

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[lightyagami]

When I create a single part share topology is not working and I am getting error :

[Keyur Kanade]

What is the version?

Can you try latest version 2020R1?

Did you check bodies before sharetopology with tools--> analysis tools--> fault detection. 

If there are any faults, please correct them. 

Also please check if you can try SpaceClaim. 

Regards,

Keyur

 

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[lightyagami]

There wasn't any fault in geometry when I check. When I try to use SpaceClaim my meshing software is stuck at loading the geometry for 1 hour. I am on version 18.1

[Keyur Kanade]

Please use latest version 2020R1. 

Regards,

Keyur

 

If this helps, please mark this post as 'Is Solution' to help others.

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[lightyagami]

I have tried latest version but some quarter plates are missing :

[Rob]

Odd. Can you check the bodies in DM and see if their volume is valid?

[lightyagami]

Well, I have finally figured out how to mesh the geometry, I have assigned edge sizing to every individual quarter circle and it gave satisfactory result. Thank you everyone for helping me.