Learning Forum

[Aras karimi]

Hi to all,

I am going to block the following airfoil in ICEM and then create a mesh structure with hexahedral elements on it:

I have succeeded in creating a structure mesh in ICEM for the airfoil that has a flat Trailing edge, but I don't know how to do this for the airfoil in the above shape?

I will be grateful if you help me.

Regards

[Essence]

Hello,

Just a question. You want to mesh the blade itself and not the domain surrounding it? If such is the case, could you please specify for what application are you meshing in the ICEM?

[Aras karimi]

I'm going to mesh the domain around it. For this purpose, I drew a C-type domain around the wing and subtracted the wing from the domain. Now I came to ICEM software for blocking and networking.

According to the figures below, I blocked the domain around the wing:

 

Then I produced its mesh, which is as follows:

 

As shown in the figure above, the mesh at the end of the airfoil is damaged and does not sit properly on the airfoil. Help me where the problem could be?

Do I have to make splits in the block or do I have to do special associations?

Regards

[mjmiddle]

I think the question Essence was asking is what CFD solver is this intended? Fluent, CFX, something else?

[Aras karimi]

I mesh the geometry for the Fluent solver.

[mjmiddle]

It's just a projection problem. The blocking scheme is essentially the same even if you decide to make some cross sectional block splits for more control. In both your previous model and this current model, you should first make sure you have associated a block edge to the geometry curve at the knife edge.

Associate face-to-surface for the top and bottom airfoil faces. Either use "part" method or "selected surface" method. For the "part" method, first move the surfaces on top to a new part name, and then move the surfaces on the bottom to another new part name. Then associate face-to-surface. See help page:

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/icm_help/iblock_assocface.html

[Aras karimi]

How can I create multiple sectional blocks for more control?

Yes, in both models, I associated the end Edge of the block to the geometry curve that is located at the end of the airfoil.

Dear mjmiddle, look, I have blocked the previous geometry, whose trailing edge was flat, as follows:

 

According to the figure above, I associated the block Edge to the geometry curve that are located at the end of the airfoil and generated its mesh, and there was no problem.

Now I want to block and grid the following geometry which has a curve in the trailing edge. I blocked it exactly like an airfoil with a smooth trailing edge, which is as follows:

    As shown above, I associated line1 (block Edge) to the geometry curve (line 2) and generated its mesh, which produced the broken mesh, and I have sent a photo of it in the previous messages.I blocked the airfoil with the wavy trailing edge exactly like the airfoil with the smooth trailing edge and did nothing else.

I don't know how to work with Associate Face-to-Surface.

Also, I opened the above link you posted, I got a registration page that asks for an account number, and I don't have it :

[mjmiddle]

You need to use the face-to-surface association. What happens when you click on the Ansys folder in your program menu list and click on "Ansys Help?"

It will open a web page. You can go to the ICEM CFD section and then the "Ansys ICEM CFD Help Manual" and you can go to sections that are pretty much organized into button names you would use in the GUI. The face-to-surface association is pretty easy to figure out if you just practice with it. I told you the basics of what you need to do in my previous post. 

[Aras karimi]

You put a link in your previous post. I copied that link into my browser’s toolbar and opened it, which brought up a signup page. (I posted a photo of it in the previous post)

From the Windows start menu, I opened Help Ansys and went to the ICEM-CFD section.

How can I create multiple section blocks for more control? Do you mean that I split the block into several parts in the direction of span wing?   Does it mean as follows?

Do you mean exactly what I have done in the picture above?

 

[mjmiddle]

Yes, I meant splits as you show. But without much curviness at the trailing edge, it may not affect the projections much. You really need to use face-to-surface association. Adding more block splits adds complexity and more vertices to move. I don't think that's necessary if you just associate the top and bottom faces.