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-   -   [ICEM] Problems adjusting a structured grid to a new baffle geometry (http://www.cfd-online.com/Forums/ansys-meshing/107712-problems-adjusting-structured-grid-new-baffle-geometry.html)

despaired student October 4, 2012 11:32

Problems adjusting a structured grid to a new baffle geometry
 
Hi,

I want to adjust an existing grid to a baffle that I implemented in the Geometry. But I don't have any idea how to do this - it seems more or less impossible. What do you think how to do this? Should I stay with structured mesh or use unstructured?

The ICEM 14.0 files are ayailable with these DropBox links

https://dl.dropbox.com/u/77194917/Modellierung2.atr
https://dl.dropbox.com/u/77194917/Modellierung2.blk
https://dl.dropbox.com/u/77194917/Modellierung2.fbc
https://dl.dropbox.com/u/77194917/Modellierung2.prj
https://dl.dropbox.com/u/77194917/Modellierung2.tin

and a picture of the baffle

https://dl.dropbox.com/u/77194917/baffle.png


Best regards,

Sören

energy382 October 8, 2012 06:41

I didn't follow that. Do you want to adjust a previous blocking (form a similar topology) to a new geometry?!

despaired student October 8, 2012 07:01

Hi,

you are right. I have an existing blocking and I want to adjust this blocking to a new geometry.
The difference between the new and old geometry is the baffle.

I can't see how it could work...so I hoped that some here has an idea...?

energy382 October 8, 2012 11:04

do the outer and inner cylinder still have the same diameter?

so only thing you want to do is to insert two additional baffles?

if so, take your blocking, split at the new created surfaces and align edges to curves .

do the membranes break through these baffles!?

despaired student October 8, 2012 11:55

Hi,

the diameter of the inner and outer cylinder don't change. What I am trying to do is to adjust the blocking (Modellierung2.blk) to the geometry (Modellierung2.tin).

The geometry I've posted already contains the new geometry. I'm sorry, I made myself not so clear in this point.

At contactpoints the membranes break through the baffles.

energy382 October 9, 2012 06:29

Quote:

Originally Posted by despaired student (Post 385572)
Hi,

the diameter of the inner and outer cylinder don't change. What I am trying to do is to adjust the blocking (Modellierung2.blk) to the geometry (Modellierung2.tin).

The geometry I've posted already contains the new geometry. I'm sorry, I made myself not so clear in this point.

At contactpoints the membranes break through the baffles.


it would be easier to use your previous (original) geometry and just transform geometry (e.g. copy cover disc geometry of your cylinder with a specified offset in y-direction to the place, where the baffles should be), and then split your blocking at these new surfaces. There's a option to copy projection.

But you can also use a new geometry (.tin-file). But here, you have the problem, that there are no assignments at all (no edge to curve projection etc). So this would be much more hassle.

Just give me a feedback, if it won't work and I'll take a deeper look at it tomorrow.

Greetings Christoph

energy382 October 9, 2012 08:43

is there any heat transfer through the baffle? then you have to create a fluid/fluid domain interface with thin material option and no slip wall. Otherwise (with solid domain) you'll get mesh problems.

nkme2007 October 10, 2012 05:53

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?

despaired student October 10, 2012 06:00

@energy382

- heattransfer is neglectable.

-
Quote:

it would be easier to use your previous (original) geometry and just transform geometry (e.g. copy cover disc geometry of your cylinder with a specified offset in y-direction to the place, where the baffles should be), and then split your blocking at these new surfaces. There's a option to copy projection.
I haven't tried this yet - thanks for the input.



@nkme2007

can you first provide some data on your problem:

geometry, some pictures maybe, I guess you would like to use structured grid

This will help to better understand your case. (I have no knowledge of GAMBIT, I can only try to give you some general blocking-advice or some ICEM blocking...)


Regards,

Sören

nkme2007 October 10, 2012 06:06

model a fluid flow through pipes that is submerged in Concrete so as to measure heat
 
1 Attachment(s)
Thank you for responding despaired student,

My problem is to model a fluid flow through pipes that is submerged in Concrete so as to measure heat transfer.

The picture...

The fluid is subjected flow through the pipes in the 2D image and I wish to find the temperature distribution.

despaired student October 10, 2012 06:32

The blocking looks good (at least I think so...). In front I'm working with OpenFoam for the simulationpart so I doubt that I can give you a good advise.

But what I noticed on your picture is that there is no grid within the pipes - correct?

Possibility 1) If you want to simulate the heat-transfer of for example from a fluid running through the pipes into the concrete you will also need a mesh for the fluid in the pipes. This means you will have a two-phase model.

Possibility 2) It might be possible to set a constant temperature at the borders of the pipes. This might be less precise (denpending on the precision level you need and the physics (velocity, heattransfer-coefficient, etc.) but easier because you need no 2-phase modelling.

--> These are just some guesses, I really do not have any experience with AnsysFluent. I just can guess from what I know from OpenFoam

--> One thing about what data to provide: usually the users (especially the more experienced) demand more information meaning they want files so that they can open your case on their computers.

nkme2007 October 10, 2012 06:57

Thank you despired student,

I have no idea about how to simulate flow of fluid in the pipes (based on possibility 1, but this is the best one as even i am thinking on). But, I dont think the possibility works out as the fluid temperature varies from place to place as it flows.

Will the cfd-online allow me to upload the case files?

And, can you get me my problem solved if you know anyone on fluent?

despaired student October 10, 2012 07:19

Quote:

Will the cfd-online allow me to upload the case files?
yes, you have a few bits for uploading. If your files are too big you can use dropBox like I did. I can give you a link if you need to find it.

Quote:

And, can you get me my problem solved if you know anyone on fluent?
Hehe, no I dont think so... you have to contact the Fluent-support or wait till someone experienced responds.
But you have also posted your problem in the wrong thread. This thread is about blocking/meshing and for ICEM

Thread: -->[ICEM]<-- Problems adjusting...

Maybe you shoulod open a new topic with your problem maybe in the FLUENT part:
Forum > Software User Forums > ANSYS > FLUENT


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