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[ICEM] Blocking strategy for multi-element airfoil

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Old   December 18, 2019, 09:45
Default Blocking strategy for multi-element airfoil
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Hi everyone,

I am trying to create a structured mesh for double-element airfoil using ICEM CFD. Luckily, my first attempt was successful (PFA, the figures). The minimum angle and determinant were 36 deg and 0.9, respectively.

But, I wish to know if there is a better way to do the blocking. Please share if anyone in the forum has any info regarding or past experiences. Let me know if you want to see the blocking and geometry files.

Thanks in advance.
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Old   December 20, 2019, 01:41
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Guys, any thoughts on the above?
Please let me know.
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Old   December 22, 2019, 13:10
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Quote:
Originally Posted by Ubuntu View Post
Guys, any thoughts on the above?
Please let me know.
may be this way? I was assuming your foil trailing edge is sharp
step1.png

step2.png
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Old   December 22, 2019, 21:13
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Hi Shereez,

Thanks for the reply. Yes, the main element and the flap has a sharp trailing edge.
Below is how I created the blocks.
1)Created a C-grid imagining, there is no gap between the airfoils
2)Then did the necessary splits and adjusted the vertices

Could you please tell me how the blocking is done in your case? If it gives better quality, I will go with it.
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Old   December 23, 2019, 04:29
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Quote:
Originally Posted by Ubuntu View Post
Hi Shereez,

Thanks for the reply. Yes, the main element and the flap has a sharp trailing edge.
Below is how I created the blocks.
1)Created a C-grid imagining, there is no gap between the airfoils
2)Then did the necessary splits and adjusted the vertices

Could you please tell me how the blocking is done in your case? If it gives better quality, I will go with it.
Alright let me have a crack at explaining it. For this particular one, I used two blocks one for the top (main) and one for the bottom (flap)

The main block is split close to the flap (vertically).

The flap block and the main block initially goes all the way back to the outlet,
The blocks that goes to outlet (one from the flap and one from the main wing) are then collapsed using collapse blocks facility in ICEM.
Then the blocks inside the flaps and wings are selected in two separate steps (or you can choose both at once) to create an O grid outside. After that its just linking the edges and linear splits, control points , mesh spacings etc to improve quality.

Ps: https://www.youtube.com/watch?v=rfMn...YtBS-&index=12

I have explained in this video slat, wing, flap blocking if you will be interested.
Blocking is a piece of art, there is no wrong way of doing it (if you know what you are doing )
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Old   December 23, 2019, 08:10
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Quote:
Originally Posted by shereez234 View Post
For this particular one, I used two blocks one for the top (main) and one for the bottom (flap)

The main block is split close to the flap (vertically).

The flap block and the main block initially goes all the way back to the outlet,
The blocks that goes to outlet (one from the flap and one from the main wing) are then collapsed using collapse blocks facility in ICEM.
Then the blocks inside the flaps and wings are selected in two separate steps (or you can choose both at once) to create an O grid outside. After that its just linking the edges and linear splits, control points , mesh spacings etc to improve quality.

Ps: https://www.youtube.com/watch?v=rfMn...YtBS-&index=12

I have explained in this video slat, wing, flap blocking if you will be interested.
Thanks, I will definitely check this method.
Good that you have created a video earlier.
I will update the thread as soon as I try the method.
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airfoil 2d, blocking strategy, multi-element, quality metrics

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