如此螺旋不知如何实现结构化网格

arwang

多谢了,不知道有没有什么较简单的方法

[ 本帖最后由 arwang 于 2008-8-16 21:33 编辑 ]

40534427

可以实现 用blk 沿着螺旋线推进即可

Kiddosuper

很基本的應用把他想成是一長條形的block
讓四個邊去投影到四條蜿蜒而上的邊界線條上
tips:
1. dont use topology repair for this case, coz you need to combine all the curves
2. use boundary curve function to generate the 4 curve (esaier)
3. use automatic linear function  (in Edit edge/split type)

the quality is very high (close to 0.8)

arwang

这些功能没有用到过,我已经将block上的四边投影到螺旋四边了,也选了auto linear split type 但发现project vertices 后,block的四边还是直的,麻烦K哥讲一下关键点.

Kiddosuper

nothing special
All tips have been writen above
Be sure to
1. snap vertice to points correctly
2. snap edges to curves  correctly
3. then use automatic linear

arwang

K哥,是不是也要把block split into mutiblocks ,then snap vertice to point ,snap edge to curve ???螺旋少些操作起来还方便的,不过要是螺旋上百个,是不是这样做有点复杂？你能把你做的prj文档上传一下,我想看看你是怎么做的.

Kiddosuper

only one block, dont need to split
I do this mesh, very quick, even you add  ten times height, the effort is same
just remember , use boundary curve to generate the required 4 helical curve

arwang

thank u .i've completed it with ur strong help.
the quality is over 8.5

arwang

突然有个问题,就是如何对这种螺旋体做O-GRid？

Kiddosuper

O grid is so easy in this case, just choose in/out face , then you get O grid
sounds you need to make more practice of blocking skills

chenhuanlong

这道题虽然做出来了，但是我还是不理解为什么要执行“use automatic linear function  (in Edit edge/split type)”这一步？相反当我执行这一步时，网格全部乱了，始终得不到高质量的网格，难道是snap vertice或snap edges to curves与use automatic linear function  (in Edit edge/split type)的顺序问题，到底是先执行谁？

rainman08

自动线性分割是将一整条自动的分成很多份以适应几何曲线的形状，省得手动去分，麻烦。
我想应该是这样

rainman08

我试过了，与顺序没有关系的，无论谁先谁后，都是一样的结果。
至于网格扭在一起，原因可能是Edge关联有误或者在“auto linear split"时，局部位置的分段点错位了。

[ 本帖最后由 rainman08 于 2008-11-2 17:04 编辑 ]

rainman08

原帖由 chenhuanlong 于 2008-11-1 15:53 发表
这道题虽然做出来了，但是我还是不理解为什么要执行“use automatic linear function  (in Edit edge/split type)”这一步？相反当我执行这一步时，网格全部乱了，始终得不到高质量的网格，难道是snap vertice或snap ...

I ve found a few advanced function.
After you "automatic linear function  (in Edit edge/split type)",you will find lots of hexa on edges which can be moved by "move vertex".By moving these hexa ，effect of spliting can be improved,and so is the Pre-mesh.
This method can solve the promblem of  mesh twisting in some local place.
The detalied infomation you can refer to is in the picture below.Hope it can help you.

[ 本帖最后由 rainman08 于 2008-11-2 15:46 编辑 ]

rainman08

Found a new  function again.
Without using  "split edge" ,higher quality mesh can also be generated by "projecete edge shape"(right mouse on "edge" in model tree and check it)"after "edge association".
Then you can modify "edge parameter" to improve the distrubition of mesh on edge.

See  picture below ,the good quality mesh (higher then 0.8)has been generated.

daqinxll

用GAMBIT2.0可以实现螺旋结构的结构化网格的划分么

hzkl

原帖由 daqinxll 于 2008-11-3 15:14 发表
用GAMBIT2.0可以实现螺旋结构的结构化网格的划分么

可以,直接划分

[ 本帖最后由 hzkl 于 2008-11-4 20:20 编辑 ]

88492773

你好，可以把这个例子做成教学贴吗？我一直在学块的这个功能，一直弄不会。麻烦把你做的步骤贴出来。可以吗？

chenhuanlong

谢谢楼上的详细解答！！

qymzszy

我用create/modify curves>surface-surface intersection生成螺旋的边界线，可是不能生成连续的曲线，请教各位是用何办法生成boundary curves呢？