[niski88]

Hi,
I read this forum and I have found many answers about my CFD Simulation problems, but now I need Your help.

I'm trying to model 3D radial fan and i have problem with 7 blade impeller which is meshing in ICEM CFD. I meshed 1/7 of my impeller (actually space between two blades + front and back disc + 3mm space above; all of this is my rotating zone). All elements are hexa.

I adds help geometry directly in ICEM (curves only ) to improve mesh by egde association.

Technique Block by block, Pre-Mesh/Projected Edges is converted to Unstruct mesh.
Now, I'm trying to copy my mesh 6 times by rotate (~51.4286 degree)/ Merge Nodes/Automatic/ delete duplicate elements; when check mesh i got errors about: Dulicate elements, Non-Manifold vertex and Penetrating Elements and i cant figure it out how should I done with this because after importing mesh to fluent I got errors.

My questions:
1) How can i resolve problem whit penetrating elements?
2) Is this properly technique of modeling impeller/rotating zone?
3) Is this mesh good quality or should I improved it more and how?
I attached files from ICEM.

Thanks for your time. I would really appreciate the help.

[niski88]

Anyone can give me an answer?

[Far]

can you please explain your model?

[niski88]

Hi Far, thank you very much for your response.

My whole model of radial fan looks like in attached pictures. It contains parts: body, inlet pipe, and impeller. That cylindical part is a part of fluid in body/impeller. All of these are already modeled as fluid and between these parts are interfaces. There is no solid part. I mesh them separately i ICEM. Only impeller will be rotational part. I meshed my impeller as 1/7 part of impeller because it have 7 blades. Now I'm trying to rotate mesh x6 to get full impeller but i got errors from first post.

Is this good strategy or should I try different?

BTW
I already have 2D model of radial fan based on the same strategy. In 2D I also rotating mesh 51.4286x6 degrees to get full impeller and i don't have any errors. Maybe in 3D it's different?