[FJSJ]

Hi guys,

I want to ask you for a doubt about blocks and quality. In the first three pictures you can see the domain, mesh quality and some blocks. Then in the 3 last, you can see a very similar example (the same as before but... with the tip). But as you can see the quality is very bad. So.. my question is..is it a normal behaviour? I mean, I´ve placed all the vertices in the same location that example before where I got a good quality . I think that, maybe, this can be for the tip blocking that is new in the second example and can influence in them but I´m not sure.

[FJSJ]

Here the bad elements in the second example

[BrolY]

Those are not bad elements, they are inverted elements ! Something is wrong with your blocking.
Share your *.tin and *.blk files so we can have a look.

[FJSJ]

Inverted elements?? I have exactly the same blocking in the first example and I don´t have inverted elements. That is my question. I can´t understand why in one yes and other not.

[BrolY]

But your geometry is not the same than in the first example ?
That's why there are inverted elements !

[FJSJ]

I have the same geometry and blocking in both examples. That´s the weird...

[BrolY]

Originally Posted by FJSJ

Hi guys,

I want to ask you for a doubt about blocks and quality. In the first three pictures you can see the domain, mesh quality and some blocks. Then in the 3 last, you can see a very similar example (the same as before but... with the tip). But as you can see the quality is very bad. So.. my question is..is it a normal behaviour? I mean, I´ve placed all the vertices in the same location that example before where I got a good quality . I think that, maybe, this can be for the tip blocking that is new in the second example and can influence in them but I´m not sure.

You said "the same as before but ... with the tip". Maybe your blocking doesn't cover that, and that's why it created inverted elements.
Can you share both projects ?

[FJSJ]

Maybe I explained wrong. I said "the same as before.." but refered at the geometry plus the tip blade. But yes, the blocking in the second example covers the tip. Look at this pictures.

[diamondx]

it should be a minor problem with your blocking , run scan mesh and scan planes for investigation

[FJSJ]

It´s possible that It can be because ICEM confused parts? As you can see, I have a color blade part in a part where doesn´t have to... Diamondx told me once again, I have to specify more precisely... Can be for this reason?

[diamondx]

the problem is related to association, you have to re-do your associations

[FJSJ]

Ok. I´ll do again the associations. I´ll post tomorrow the result.

[FJSJ]

However, the edge association picture of this examples is this. And I don´t see any wrong association. The problem is only in that area or.. can be in any of them?

[FJSJ]

I think I´ve just resolved the problem about inverted cells. I´ve disassociated from geometry the edges but It didn´t work. So.. I used "Associate Edge to Surface" tool and problem was resolved. Here the picture. Thank you guys for the answers!

Although I would like to know why in the first example that I showed you I didn't have to use this tool and only I used "edge to curve associate". How does this behavior depend?

[FJSJ]

I don´t know If I should create a new thread or not to ask for this topic... I´ve reduced highly bad elements but I have a bit of them. The problem is that bad elements are in a difficult area.. the tip. I got this approach few days ago. And now, I don´t know if I have to think in other approach or I can improve this one. I´ve seen Ralen´s approach but I decided to think in other because my domain is cylindrical. So... if anybody can provide some idea... this is welcome.
Thanks!