[osuRobin]

Hi everyone,

I am trying to create a 2D hybrid mesh with Gridgen (v. 15.18). The geometry consists of a turbine vane, that has an internal cooling cavity and a slot for film cooling. Essentially, I would like most of the mesh to be unstructured, with a structured boundary layer around the blade profile.

When I export the grid to Fluent, I get the error:
"cell(s) might not be closed, e.g. a face is missing fluent ...." and something about a cell centroid. I also get the "Left-handed" faces error.

I'm not sure that I'm doing the domains and blocks correctly. Any help, advice, anything would be appreciated!

Thanks,
Robin

[cnsidero]

Robin,

Sorry for the slow reply. My default answer for 2D meshes with Fluent is to be mindful of the domain orientation. First, the domains must be in the XY plane. Second, the domain normals must be pointing in the +z direction. For unstructured domains this is obvious. For structured domains, it's less obvious and you determine it from the IJ computational coordinates, ie. K should point in the +z direction. See this previous explanation I gave:

Pointwise to Fluent problem

Let me know if that is the issue, otherwise you'll need to provide some more information.

Regards, Chris

Originally Posted by osuRobin

Hi everyone,

I am trying to create a 2D hybrid mesh with Gridgen (v. 15.18). The geometry consists of a turbine vane, that has an internal cooling cavity and a slot for film cooling. Essentially, I would like most of the mesh to be unstructured, with a structured boundary layer around the blade profile.

When I export the grid to Fluent, I get the error:
"cell(s) might not be closed, e.g. a face is missing fluent ...." and something about a cell centroid. I also get the "Left-handed" faces error.

I'm not sure that I'm doing the domains and blocks correctly. Any help, advice, anything would be appreciated!

Thanks,
Robin

[osuRobin]

Hi Chris,

Thanks for your reply. I took a look at your other post, and I don't think orientation is my problem. I think the problem has to do with the interface between the structured and unstructured domains, and perhaps also with how I am creating the domains/blocks.

What other information can I provide that would help?

Thanks so much!
Robin

[cnsidero]

Originally Posted by osuRobin

Hi Chris,

Thanks for your reply. I took a look at your other post, and I don't think orientation is my problem. I think the problem has to do with the interface between the structured and unstructured domains, and perhaps also with how I am creating the domains/blocks.

What other information can I provide that would help?

Thanks so much!
Robin

Well the best would be if you can send me the mesh file to inspect. If you can't send it, the next best thing would be to post pictures of where you think the problem is occurring. If you can send it to me send me a private message and I'll give you my email address.

Something else just came to my mind. You need to create one volume condition for each of your Fluent zones. For example, if you had 6 domains representing your fluid region, create a volume condition and assign those 6 domains to the fluid VC. Same for the solid region. It's important to assign your domains to volume conditions for Fluent export. Otherwise the Pointwise will create one VC and thus a Fluent zone for each domain it exports - generally not what you want.

-Chris