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April 24, 2013, 06:17 |
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#42 |
Senior Member
christine
Join Date: Jul 2009
Location: europe
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I can read the other parts of my geometry, this is the only one I cannot read.
For all the other parts, I have periodicity problem: all the periodic zones are considered as translational, I can change in Fluent to rotational but then the angle is equal to 0 and I don't find where I can give Fluent the real value of the angle. I couldn't read your file (Far) since some files are missing. Or can I use mine to complete (*.uns..)? Rodriguez: I don't have this message, when it starts to read the mesh, appear the message I've posted before. Can you explain me how you deal with periodicity in Fluent? I am working on Linux, Fluent in parallel. |
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April 24, 2013, 06:21 |
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#43 | |
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christine
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Quote:
For periodicity I did : Mesh/Global Mesh Setup, then Set-up periodicity (basis 0.0.0, axis 1.0.0 and angle 45) Blocking/Edit block, then Periodic Vertices Then in Output/Boundary Conditions, I give the periodic conditions to the surfaces |
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April 24, 2013, 06:28 |
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#44 |
Super Moderator
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Instead of default method choose "vector option and select two points of axis of rotation (make these points by yourself). Also when you apply Y-block every thing goes away like edge mesh parameters, association and even periodicity. So you have to again associate, again define periodic vertices and again specify edge mesh parameters (This is bug I think in R14.5) and then you are done.
PS. 1. Files I have uploaded are saved in R14.5. Are you able to open .tin and .blk if yes then you can get generate mesh yourself. 2. I am attaching a sample project done for you where periodicity is applied. |
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April 24, 2013, 06:31 |
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#45 |
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Philipp
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In Icem: You just need to give some name to each surface you want to become periodic, such as "front" and "back" or whatever. Export your mesh.
In Fluent: Go to the "Cell Zone Conditions" and click on each of the surfaces. Note the "ID" number, that is shown in the tab. Then, go to the fluent terminal and type: "mesh" then "modify-zones" then "make-periodic". Follow the instructions. Fluent will then delete one of the zones an the other one will be left under "Cell Zone Conditions". If you click on that surface a "periodic conditions" button will appear, where you can set up things such as pressure drop along the periodic zones.
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April 24, 2013, 06:33 |
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#46 |
Super Moderator
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I showed in one the posts that you can output one periodic boundary condition in ICEM to Fluent easily (your case has single periodicity) and whereas for double periodicity you should define one in ICEM and other in Fluent
Ok found it http://www.cfd-online.com/Forums/ans...ty-fluent.html Here we go for more http://www.cfd-online.com/Forums/ans...ification.html http://www.cfd-online.com/Forums/flu...-geometry.html http://www.cfd-online.com/Forums/ans...h-overlap.html |
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April 24, 2013, 07:10 |
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#47 |
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christine
Join Date: Jul 2009
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Oups, quite hard to understand...I look at it now.
In the meantime, I've generated the mesh from your file and this time, Fluent could read it. But as for the other parts, the periodicity is set to translational. So I tried to do what Rodriguez wrote, but the strange thing is that when imported in Fluent, I have just 1 periodic surface, no shadow, so maybe Fluent just see 1 surface instead of 2 and that's why he puts directly an angle of 0 when I tell him to use rotational. mean, if considering your file, in Fluent, I just have per1, no per2, but on the display, when I clic on per1, I have the 2 surfaces (Fluent puts per1+per2 in per1) |
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April 24, 2013, 08:20 |
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#48 | |
Super Moderator
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Quote:
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April 24, 2013, 08:30 |
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#49 |
Senior Member
christine
Join Date: Jul 2009
Location: europe
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I really don't understand: I've created a part with NO PERIODICITY (no periodic mesh, no vertex periodic...no boundary condition with periodicity in ICEM)... but it's not read in Fluent and I've a message telling that 2 zones have inappropriate zone type (periodic)...but I didn't specify ANY periodic zone in ICEM !!!
I'm getting really mad now. |
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April 24, 2013, 08:30 |
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#50 |
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christine
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April 24, 2013, 08:31 |
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#51 |
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Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
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Did you free all the points in ICEM from beeing periodic? Did you recreate the premesh and re-convert to unstructured mesh?
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April 24, 2013, 08:42 |
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#52 |
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christine
Join Date: Jul 2009
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yes I did.
But the names of surfaces were "periodic_dx" and "periodic_sx", I didn't change that...they are just...names...but this time, I named them : "titi" and "toto"...and Fluent read them as separate surfaces (maybe putting the word "periodic" in the name gives automatically to Fluent the "idea" of periodicity ), no problem for check grid...WUNDERBACH :-) .... but impossible to create the periodicity in Fluent, following your advices.... sorry if you already read that post : ok for periodicity, I just forgot to change the axis in Fluent. It's ok now. So, it seems that a name shouldn't contain "key" words. But why do I have to do it like this? Periodicity in ICEM should be ok! |
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April 24, 2013, 08:44 |
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#53 |
Super Moderator
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April 24, 2013, 09:00 |
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#54 |
Senior Member
christine
Join Date: Jul 2009
Location: europe
Posts: 125
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yes, he did it :-) (45 degrees)
But I still don't understand why I have to cancel all periodicity in ICEM. Isn't there any risk that creating mesh in ICEM with no periodic conditions, leads to an "non-periodic" mesh? I mean, a mesh that would not correspond cell by cell on the 2 surfaces? |
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April 24, 2013, 09:02 |
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#55 |
Super Moderator
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Yes it should do as want to do. But for that you need to understand how ICEM periodic function works. You have to specify that at two places. One in mesh panel and second in blocking (making all corresponding vertices periodic)
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April 24, 2013, 09:03 |
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#56 |
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Philipp
Join Date: Jun 2011
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As far as I understand it, you have to ensure that by yourself. Also, I think that marking nodes as "periodic" won't do that for you. But maybe I am wrong.
ps: great that you did it!
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April 24, 2013, 12:44 |
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#57 |
Senior Member
christine
Join Date: Jul 2009
Location: europe
Posts: 125
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hi Far, Rodriguez,
well, about periodicity in ICEM, except the fact that I was using the "user defined by angle" instead of "vector", where am I wrong? I was doing this: Mesh/Global Mesh Setup then set-up periodicity Blocking/Edit Block , then Periodic Vertices (selecting the pair of periodic vertices, respecting the same orientation each time) Output/ Boundary Conditions , then giving periodic to the periodic surfaces you're right Rodriguez, I'm happy it's quite done, but it's not automatic to cancel the periodic vertices, sometimes when doing Pre-Mesh and loading the mesh, everything is going wrong...so I have to cancel blocking and do it again....taking a lot of time. The good point is that I'm learning a lot like this. Another question, when doing block, the points and curves must not be included really? only surfaces and body? maybe I'm wrong with this from the beginning. Thank you so much to all of you; I wouldn't have done it without you. It's not completely finished, but I hope big problems are over now. |
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April 24, 2013, 13:12 |
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#58 | |||
Super Moderator
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April 29, 2013, 05:42 |
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#59 |
Senior Member
christine
Join Date: Jul 2009
Location: europe
Posts: 125
Rep Power: 16 |
Hello again !!!
I've meshed all the different parts, merged everything in Fluent. It was ok, but when running simulations, results were really strange, I think I had too many interfaces. So I've been trying to mesh again in 1 piece... I've done it maybe 10 times!!! and everytime, there is something wrong. I send you the last try. Could someone tell me why the mesh is coming like this (at the upper right "corner" ) ? sometimes, this part comes ok but with other problems and sometimes not. I always do the same thing so I really don't understand. |
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April 29, 2013, 06:07 |
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#60 |
Senior Member
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 26 |
Hi, there is a .zipx file inside the zip file. Can you uplaod a "common" file format? Such as just .zip ?
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