[Hcapellato]

Hello everyone!
I really need help about an issue.

I'm doing my Final Year Thesis (a radiator inside a duct) and I'm having a problem to generate my mesh.
On my Ansys Meshing the following message appears: "The following surface or surface bound may have incorrect orientation"

I need to finish my simulation soon because my time to deliver my thesis is finishing...

If someone can help me will be great!

Regards,
Henrique

[fresty]

the message seems pretty clear i guess but still a clear picture of your design would be important for any one to try and help...

[Hcapellato]

Dear Fresty,
I don't know how to fix this problem... I already try the repair tools on designmodeler and fix the geometry of my radiator fins to solve this problem, but Ididn't have success.

Attached I uploaded the profile of my fin in light brown (I change the design from elipse to rectangle to solve the problem, but I'm sill without success)

How I should proceed? My time is ending...

[fresty]

Have you tried applying local mesh controls?? The depth dimensions of the fins seem pretty minute..local mesh sizing may be the only answer to achieve a proper grid..
You may also have to reconsider if this is the best way to model your system..
Details about what you intend to achieve or details about your simulation may have a significant impact on answering your query as well..

[Hcapellato]

To avoid this problem, yesterday I changed the geometry of my fin (from an elipse to a rectangle), however this approach didn't change the problem to generate the mesh as well as perform refinement on this area.

The only thing which allow me to generate the mesh was change my domain from (10 x 10 x 35 meters to 5 x 5 x 15 meters)...
I don't know why, but this was the only approach which allow me to generate my mesh (same configuration and withouth refinement methods!!!)

Now I can simulate but with low accuracy of my results...

[fresty]

I think it is pretty simple to comprehend.. automatic grid generation depends on determining the minimum element size and usually if the ration between the minimum length and maximum length is too high the automatic grid generator fails.. so by reducing the size like you did, you have brought down the ratio to an acceptable level.. this sort of roughly explains your case.. once again you may still need to ponder on a different way of modelling your system if your focal point is the performance of the fins..

[vasava]

Can you post pictures of your geometry? Are you using any of the size functions?

[Hcapellato]

This is a radiator and these are the fins.
each fin has 2mm of thickness and 0.048 of lenght

[Hcapellato]

fresty, despite I increase my domain, I applyed a Body of Influence with the same size of my small domain and with the same element size, even with this approach the mesh fail...

[vasava]

First, disable the advanced size function. This will give you a better control of the mesh. Next, select all the edges for the small finns and impose a size (e.g. size of the smallest edge). Use cut-planes to notice and make sure that you have fine mesh where it is needed.

Also I recomend you to first make a smaller model that has less finns i.e an axi-symmetric representation of the main model. Try all the mesh set-up(s) you want to and once you find optimum setup, switch to the bigger model.

[Hcapellato]

Thank you very much Vasava!!
I applied the sizing on the problematic edges and the mesh was generated with better quality and with less elements than the first mesh!
Perfect...

Thanks again,
Henrique