Learning Forum

[Daniel.dejan.gunde]

Hello!

I'd need help with finding the most efficient approach and tool choice for meshing a Lafond turbine. It probably needs to be a structured mesh but let me know if there are other options. ICEM CFD would be the last resort so I was hoping if there is some other way to mesh the turbine in the way you can see in the attached figure. The main idea is to substantially reduce the total number of cells by stretching the cells in the axial direction of the turbine. Can it be done in Ansys Meshing or perhaps in Turbogrid? If yes, can you provide even some example or tutorial? Thank you very much for your help!

Best regards,

Daniel

[Rob]

With a small amount of decomposition it'll mesh in Ansys Meshing with a swept mesh, check the tutorials out in Help. Otherwise Multizone in Fluent Meshing (use 24R2) ought to work. 

[Daniel.dejan.gunde]

Thank you for a fast reply! Besides the help file do you have some more examples or tutorials that can be found elsewhere or on your webpage? I was hoping I could find a similar meshing problem as a base.

[Rob]

https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/prod_page.html?pn=Meshing&pid=Meshing&lang=en

https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/prod_page.html?pn=Fluent&pid=Fluent&lang=en

I very much doubt you'll find an exact match for your case, Intro tutorials are intended to show a feature and how it's used. Even advanced content tends to be fairly generic so it can be used across most/all industries & applications. Ie your device could be fixed so generate swirling flow, forced rotation as a pump or free rotation caused by flow to generate power! I'd mesh a pipe in much the same way: extrude/sweep a face mesh down the section. 

[Daniel.dejan.gunde]

I understand. Thank you for your help!

[Daniel.dejan.gunde]

Hello again,

My case would be best solved by using ICEM CFD but I don't know how to use block meshing and the learning curve is steep. Furthermore it is a pitty that ICEM is not being updated anymore allthough it is still being widely used both in industry and academia. At the same time I'm worried that if I learn block meshing my newly acquired knowledge will not be "future proof". The ICEM feels old and is buggy and I'm afraid that it will just disapear from the Workbench soon. What's the ICEM CFD's destiny/future? I guess your goal is to completely replace ICEM with Ansys meshing? 

In your opinion, what software is is a better bet to invest time into for ocassional structured meshing?

[Rob]

As of 25R1 I'd probably focus on using Multizone in Fluent Meshing. Equally, I've not built a fully block structured mesh in about 15-20 years, nor used a solver that needed one in that time. 

[Daniel.dejan.gunde]

Why would you prefer Fluent Meshing over Ansys meshing? Does it have some special strength? I find Ansys Meshing slightly more user friendly and 3D Connexion support is a big plus. 

[Rob]

Generally faster, more robust and I can poly just about anything. I do use (and like) Ansys Meshing, but for Fluent we usually just train Fluent Meshing now. 

[Daniel.dejan.gunde]

I also noticed it's fast and polymeshing is just wonderful. Do you know what will happen with ICEM?

[Rob]

I don't, but given we tend not to switch off tools ICEM CFD is likely to be around for a while. 

[Daniel.dejan.gunde]

I decided to go with Ansys Meshing and I think I found a good aproach how to mesh it. However I have some troubles with Workbench/Ansys Meshing. I get this error message and I cannot open any mesh at all in Workbench after a lot of work.

AnsysWBU.exe encountered a problem. A diagnostic file has been written: C:\ ............AnsysWBDumpFile.dmp

What could be the problem?

 

[Rob]

Any mesh or just this project? 

[Daniel.dejan.gunde]

It was for any mesh in any project. It seems that I solved that problem. I had to remove the following folder: c:\users\appdata\roaming\Ansys.

However, a new old problem reapeared. It had happened before and because of it I started over with the current project in hope that it won't reapear but it did anyway. This time it is for any mesh in any project. I was looking for solutions before but couldn't find anything in this topic.

[Rob]

That's been covered before - check in Products. I don't support the install/software side of things so leave that for people far better trained in that than I am. 

[Daniel.dejan.gunde]

I understand. Thank you for a quick help again!