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[ICEM] Propeller blade-Shifted periodic or J-Type BLOCK

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Old   August 9, 2013, 06:50
Default Propeller blade-Shifted periodic or J-Type BLOCK
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venkatesh
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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
Attached Images
File Type: jpg Figure1.jpg (35.0 KB, 45 views)
File Type: jpg Figure2.jpg (65.3 KB, 48 views)
File Type: jpg Figure3.jpg (89.3 KB, 51 views)
File Type: jpg b.JPG (39.8 KB, 50 views)
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Old   August 14, 2013, 12:50
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Cesar
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Dear venkatesh,

This is a pretty interesting problem that surely needs a lot of ingenuity during blocking. By the way, I couldn't see the attached image that you posted in the other thread. I have not meshed anything like that but I can try to help you. Let me take a look at the geometry and blocking files that you just posted and I'll let you know if I find a way to tackle this problem.

Regards,
César
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Old   August 15, 2013, 09:43
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Dear cesarcg,

Thanks for your reply. I am struggling a lot to mesh this geometry.


I have uploaded the images of the thread

Shifted Periodic topology

Regards,
venkatesh
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Old   August 15, 2013, 10:07
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Dear cesarcg,

Please have a look on the below post, I have already generated a mesh with the help of Far.

Quarter O-grid topology for propeller blade

But In this current post, I want to generate mesh with shifted periodic topology.
waiting eagerly for your suggestion.

Regards,
venkatesh
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Old   August 16, 2013, 20:08
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I have seen your geometry and blocking files. It is difficult for me to start from the 3D model. I think it would be easier to start by proposing the strategy for a 2D model and then, based on that, propose a strategy to mesh the 3D model. Let me know if you can generate a 2D model using the aerodynamic profile that you are using at the root of the rotor.

Regards,
César
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Old   January 5, 2014, 07:06
Post Help in cfd plz
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I am new to cfd i hav to do a project on propeller simulation . can any body help me plz in this regard . . . . . awaiting
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Old   January 5, 2014, 12:45
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For quick simulation you can use Prism+tetra. However hexa will give you good results but will take some time to learn...
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