[ICEM] turbine blade meshing

sk0pa · September 13, 2011, 08:12

Hello, I’m trying to set up a 3d structed mesh in flat turbine blade cascade using blocking stratagy. Model consists of one blade and periodic bondaries. As a result I have mesh with hight skewness cells . Blocks structure presented on screenshot. Would you explane the stratagy of turbine blades meshing?

brunoc · September 14, 2011, 00:03

Hi skopa,

What you need here is a blocking strategy that is not so straightforward. Basically you'll have to create a block similar to the ones generated by Turbogrid, where periodic vertices belong to blocks originally from different axial positions. If you send us your .tin file maybe we can get you started.

Cheers

Ludvik · September 14, 2011, 03:15

see: http://www.youtube.com/user/ansysinc#p/u/29/tYrbScUH9RE
cca 3 minute

sk0pa · September 16, 2011, 05:33

Quote:

Originally Posted by brunoc

Hi skopa,

What you need here is a blocking strategy that is not so straightforward. Basically you'll have to create a block similar to the ones generated by Turbogrid, where periodic vertices belong to blocks originally from different axial positions. If you send us your .tin file maybe we can get you started.

Cheers

Unfortunally I haven't turbogrid license. But all exaples of turbogrid blocking structure were applied to geometry with less angle of flow turn then in my case. I tried to split block structure as shown in the picture, but it doesn't solve my problem. There are hight skewness cells near the trailing age. And I tried smoothing and it doesn't solve my problem.

sk0pa · September 16, 2011, 08:46

link with geometry
http://www.4shared.com/file/g_xokif3/Mesh.html

brunoc · September 16, 2011, 10:22

Hi skopa,

There seems to be something wrong with your geometry, since both the hub and the shroud have the same area. This means that it has and infinite radius. If you're working with a turbine, that's impossible.

Anyway, here's a shot at the blocking of your geometry. Correct anything you like and set the bunching.
http://www.4shared.com/file/rhaO7DBt/project1.html

BTW, it just struck me that you can generate this mesh a lot easier if you just create it inside ANSYS Meshing using either a sweeping or a Multizone method. You'll get something similar to what I did without almost any effort.

sk0pa · September 19, 2011, 05:14

Quote:

Originally Posted by brunoc

Hi skopa,

There seems to be something wrong with your geometry, since both the hub and the shroud have the same area. This means that it has and infinite radius. If you're working with a turbine, that's impossible.

Anyway, here's a shot at the blocking of your geometry. Correct anything you like and set the bunching.
http://www.4shared.com/file/rhaO7DBt/project1.html

BTW, it just struck me that you can generate this mesh a lot easier if you just create it inside ANSYS Meshing using either a sweeping or a Multizone method. You'll get something similar to what I did without almost any effort.

Thank you for mesh, but I can't understand some operations which you did. Could you send me script file? the hub and the shroud have infinite radius, because this model is for aerodynamic tunnel.

brunoc · September 19, 2011, 18:17

Sorry, but I don't have a script file. What didn't you understand?

nabilhaneef · October 24, 2011, 14:26

Hello,

I am a new user for the CFD tool and i am doing a current project work on the cascade arrangement of the NGV.. THe problem is that i have set my model in ICEM meshing tool but i am stuck with the grid generation.. Can any one guide me how do i generate the grid and what are the methods involved... its the same form of grid as posted earlier.. How is the grid dimensions set.
Also i am stuck with the validation part of the CFD.. Can anyone help me with these details too.. SO that i can validate my CFD results..

Far · October 25, 2011, 09:59

awesome topology, I really like it. How did you make it?

Far · November 10, 2011, 04:59

@ sk0pa

I did mesh on your geometry, if you need any guidance or script file I am more than happy to help you

hadikhayyamian · March 30, 2012, 22:51

Hi Far;
can I see the blocking of the above 2D mesh, please?

hadikhayyamian · March 30, 2012, 22:53

Hi SK0Pa,
I think in your figure, the leading edge is not associated with its corresponding block edge.

Far · April 5, 2012, 08:43

Hi

I do not have the blk. I can reproduce the topology for you.

ticsh · April 17, 2012, 07:17

hi Far!
could you share the block file with geometry plz )

Far · April 17, 2012, 07:30

Just give me some time to reproduce the blocking.

ticsh · April 25, 2012, 06:49

What are the main criteria of mesh quality in ICEM CFD for such objects? Are they differ for different solvers?

brunoc · April 25, 2012, 07:01

Quote:

Originally Posted by ticsh

What are the main criteria of mesh quality in ICEM CFD for such objects? Are they differ for different solvers?

Yes, each solver has it's strenghts and depends on certain quality metrics. But as a general rule for CFD solvers you should look at face angle (angle between two faces or edges), aspect ratio and volume change. On most cases, checking the skewness alone will give you an idea of your mesh quality.

venkat_aero2007 · August 9, 2013, 05:54

Hi
I am trying to mesh a propeller blade. I tried to mesh the propeller blade just like the wing. The propeller geometry is shown in the figure 1. Firstly I created a block and made it periodic. Then I made a two horizontal split (along y-axis), one in the front of the blade and other behind the blade. And I also made two vertical split (along x-axis), one in the suction side and other in the pressure side. Then I inserted a O-block and merged the vertex in the trailing edge and converted into C-block. Then I associated the edges to the curves of the airfoil section of the propeller blade. Figure 2 shows the block details. I made several split along the span of the propeller blade and associated the edges as I said previously. I got a nice mesh with good quality.

Actually I want to do optimization so I am going to automatize the meshing process. When I change the twist angle along the span of the blade, I get high skew cells near the blade region as shown in the figure 3. I am going to change the twist angle continuously during the optimization process. So this blocking strategy doesn't work.

I heard of shifted periodic blocking strategy will fine for the highly twisted blade. I have seen several posts about the shifted periodic block but I really don’t know how to do it and I don’t know how I can apply the shifted periodic for my propeller blade.

I need a blocking like figure 4. But I dont know how to get that. Please help me to construct such blocking strategy. I have attached the tin and block file. Please help me.

https://www.dropbox.com/sh/jkl3dqoaf...ont_domain.tin
https://www.dropbox.com/sh/jkl3dqoaf...ont_domain.blk

https://www.dropbox.com/sh/jkl3dqoaf...ont_domain.prj

gemxx · March 7, 2015, 06:44

Hi everybody,
I have a question about blocking. I'm new user in ansys and I study on icem for meshing generation. I've a 3D blade geometry. But I need to mesh this blade in 2D. Firstly, I need to convert this 3D geometry to 2D geometry.

How can I convert it to 2D ? I need its side view.

September 16, 2011, 08:46	turbine blade meshing	#5
sk0pa New Member GavrilovIY Join Date: Sep 2011 Location: Russian Posts: 5 Rep Power: 14	link with geometry http://www.4shared.com/file/g_xokif3/Mesh.html mr.dargahi likes this.

September 16, 2011, 10:22		#6
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	Hi skopa, There seems to be something wrong with your geometry, since both the hub and the shroud have the same area. This means that it has and infinite radius. If you're working with a turbine, that's impossible. Anyway, here's a shot at the blocking of your geometry. Correct anything you like and set the bunching. http://www.4shared.com/file/rhaO7DBt/project1.html BTW, it just struck me that you can generate this mesh a lot easier if you just create it inside ANSYS Meshing using either a sweeping or a Multizone method. You'll get something similar to what I did without almost any effort. sk0pa likes this.

October 24, 2011, 14:26	Cfd on ngv cascade	#9
nabilhaneef New Member Nabil Join Date: Oct 2011 Posts: 5 Rep Power: 14	Hello, I am a new user for the CFD tool and i am doing a current project work on the cascade arrangement of the NGV.. THe problem is that i have set my model in ICEM meshing tool but i am stuck with the grid generation.. Can any one guide me how do i generate the grid and what are the methods involved... its the same form of grid as posted earlier.. How is the grid dimensions set. Also i am stuck with the validation part of the CFD.. Can anyone help me with these details too.. SO that i can validate my CFD results..

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September 14, 2011, 00:03		#2
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	Hi skopa, What you need here is a blocking strategy that is not so straightforward. Basically you'll have to create a block similar to the ones generated by Turbogrid, where periodic vertices belong to blocks originally from different axial positions. If you send us your .tin file maybe we can get you started. Cheers

September 14, 2011, 03:15		#3
Ludvik Member Join Date: Apr 2009 Location: Czech Republic Posts: 65 Rep Power: 18	see: http://www.youtube.com/user/ansysinc#p/u/29/tYrbScUH9RE cca 3 minute

September 19, 2011, 18:17		#8
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	Sorry, but I don't have a script file. What didn't you understand?

March 30, 2012, 22:51		#12
hadikhayyamian Member Khayyamian Join Date: Dec 2010 Posts: 46 Rep Power: 15	Hi Far; can I see the blocking of the above 2D mesh, please?

March 30, 2012, 22:53		#13
hadikhayyamian Member Khayyamian Join Date: Dec 2010 Posts: 46 Rep Power: 15	Hi SK0Pa, I think in your figure, the leading edge is not associated with its corresponding block edge.

April 5, 2012, 08:43		#14
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Hi I do not have the blk. I can reproduce the topology for you.

April 17, 2012, 07:17		#15
ticsh New Member Join Date: Aug 2011 Posts: 8 Rep Power: 14	hi Far! could you share the block file with geometry plz )

April 17, 2012, 07:30		#16
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	Just give me some time to reproduce the blocking.

April 25, 2012, 06:49		#17
ticsh New Member Join Date: Aug 2011 Posts: 8 Rep Power: 14	What are the main criteria of mesh quality in ICEM CFD for such objects? Are they differ for different solvers?

March 7, 2015, 06:44		#20
gemxx New Member gemxx Join Date: Feb 2015 Posts: 28 Rep Power: 11	Hi everybody, I have a question about blocking. I'm new user in ansys and I study on icem for meshing generation. I've a 3D blade geometry. But I need to mesh this blade in 2D. Firstly, I need to convert this 3D geometry to 2D geometry. How can I convert it to 2D ? I need its side view.