mesh a mixing tank
 

Hello
I am doing a project about mixing tank, I have done the geometry in gambit, but I do not know how to mesh well. Firts I did with Tet/Hybrid and Tgrid, but when I export to Fluent and I check it, it gives me some errors.
For the geometry I have done the tank after the impeller and I have created and interface between them.
Could anyone tell me how to mesh and if I have done well the geometry??

Thank you

instead of ansys meshing, try ICEM. I have some of these cases recently.

Hi far:

I tried to do with icem, but I do not know how it works, I have done three tutorial of icem. but I don´t know how to mesh the mixer in icem. Could you tell me how I can learn this program?
Below of your text is a web direccion, Can I ask there to help me? or what do you recommend to me?

That link is expensive :p

We will work here.

http://imageshack.us/a/img441/7810/stridtank2010.jpg

http://imageshack.us/a/img820/9015/striiringtank002.jpg

ok,thanks. At this moment I can´t show you what I have done in icem, because the university at this moment is close.
The geometry I did in gambit and after export to icem, I exported as a parasolid, and after I imported this geometry, after I went to blocking and create block, and after I think that I have to split block but I don´t know in how many cubes I have to split. I can not tell you now more, I know that this is nothing but is it allright? tomorrow I would ask you how can I continue if comes well to you.

Thank you very much

Thats fine. Come back tomorrow and we will work on your case.

Hi
Here I have my design, I am going to attach two pictures for you to see if I have done all right, I put also all boundary conditions in gambit, is it right?
could you tell me what do I have to do now in Icem to start meshing?

Thank you very much

CFX tutorial 17 looks similar to your case, which uses two meshes; an unstructured mesh around the blade and a structured mesh in the tank. Would it be easier to copy that approach instead to get you started quicker?

If look at the pics in my previous post, you would notice that I have meshed exactly same geometry in ICEM.

Yes I see, but I do not know how to mesh like that, could you tell me the steps to get this mesh?

I have tried doing a mesh going to mesh and compute mesh, after I choice hexa-dominant, and I get this mesh.
I think that this is wrong because the mesh in only on the surface, to make a mesh in all I think that I have to go to block all the geometry and after split block, but I do not know how to split well, and after how to connect the blocks with my geometry, could you tell me how to do it?

Thank you very much

No No.

Go to blocking tab. Create master block. Split at the appropriate locations. Associate edges to curves.

I make create block , after I split creating three cubes, and I associate with the curves.
I do not know in how many cubes I have to split, is it all right?

Hi freiends can you tell me step by step geometry making of stirred tank? I create impeller, tank, and moving zone(middle cylinder), but I dont know other seps. I use GAMBIT. Best Regards Reza

I think that what you want is how to get the volumes, is it?
Once you have all geometry you have to go to volume and subtract, you choose in the first the tank and in the second the middle cilinder and click retain for the middle cilinder, and ok. next you choose for the first the middle cilinder and the impeller for the second, you can retain the impeller if you are going to specific the zone of the impeller as a solid.

Thanks for reply yes, you understand rightly. I dont want to be solid zone because I dont solve enregy equation. If I subtract impeller from middle cylinder, the shaft eliminate, yes?

yes
if you do not click retain the volume is deleted

and shaft?

For the shaft you have to choose in the first step with the middle cilinder, after, you have to choose with the impeller. there will be a piece of shaft, you have to go to volume and just delete it.

I am making tut on it :D audio - video ;)

Thank you so much Please forgive me, I confused. I dont know what should I do. please write again step by step. when I export mesh to fluent, surface of middle cylinder define as wall automatically. what should I do, now? Best Reagards Reza

thanks so much far, I am waiting for you:D

reza, in boundary conditions, you have to select the middle cilinder and put as a interface, you will have six interfaces, three from the tank volume and other three form the impeller volume. After in fluent you will have to connect the interfaces, the up faces, the down faces and the cilinder.

Thanks in advance

Hi Far, don´t worry but I would like to know if you really are going to send me the video. I can wait, but I want to know sure that you are going to send me.

Yes it has been on my list for long time. I hope to complete this week.

Hi Far:

I still waiting for the video, I hope you don't forget. It will be fine if you sent me the video before wednesday if is possible.
Do you need my email? or is possible to post here the video??

Thank you

Mikel Mendibe

Hi far:

Could you tell me If you are going to send me the video tutorial how to mesh in Icem the mixing tank? I would apreciate so much, I need it as soon as possible please.

Regards

Mikel Mendibe

Hello Far,

I'm trying to mesh up a stirred tank, but not with Gambit or ICEM, but with Ansys Meshing, and I have some problems. For the first question, is it a good option Ansys Meshing, or it's better if I work with ICEM? and then, as I see in your last comment on this post you said that you're making a tutorial on this, is it right? and can I have its link, or could you email it to me please?

Thanks in advance,
Solmaz.

Hello Far,

I also work on stirred tanks, and firstly I meshed it in Ansys Meshing, but no good results. I wonder if you had made the tutorial you talked about in your last reply to this post? I will be more thab grateful if you could share it with me.

Thanks in advance,
Solmaz.

no, I did not complete it. But i am thinking to do it now

Hi Far,

Thank you for answering me. So I'll wait for it!

So would you please answer one more (general) question? I tried a Fluent case with a mesh I made in Ansys Meshing by MRF method, which had swept mesh in whole volume except in rotating zone (arround impellers) in which the mesh was unstructured (actually as it was advised by a tutorial in Ansys Meshing), but the answers was not good at all, actually it did not converge!

So after some research in internet I reallized that it's better if we can use sweep meshes everywhere, even in the rotating zone (am I right?). So here is my problem in fact. I don't know how to create structured mesh arround the impellers, because Ansys Meshing says this body is not sweepable. Should I make it with ICEM? I mean is it the only way for that? in Ansys Meshing it's not possible?
And if yes, how I can learn ICEM? are the tutorials enough? because as I checked them, I don't see any simillar thing to this case (stirred tank I mean).

I will be really apreciated if you could guide me, I really need it.

Thanks,
solmaz.

ICEM meshing
 

Hi

I am working with gas-liquid stirred vessel. At first I made my mesh in Ansys but I did not obtain good results. I am thinking to make my mesh using ICEM. I would really appreciate if anybody can help me and explain me how I should work with ICEM in details.

Thanks
:)

Nasim,

Can you talk about your system a bit? How many impellers? What gas flow rates? Also by not getting good results could you elaborate on what you mean by that? What parameters are you looking at? It is well documented in literature that there are certain scenarios where gas liquid mixing system fall off in accuracy.