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Old   February 28, 2009, 14:50
Default Type of meshing
  #1
Cheung
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hi there,

I'm doing a work on flow over a cube using gambit & fluent. Basically, I put a solid cube of 1.25cm in size in the middle of a tunnel of dimension 390x60x5cm (x, y & z respectively). The problem that I have at the moment is getting proper meshes (face and volume meshes) onto my object. I need to have very fine meshing at the region around the cube (infront, sides, top & back of the cube) cause that's where the I'm going to do the analysis from. I have tried using size function but it resulted in either poor quality meshes or errors would appear.

Any advice/guidance would be mostly appreciated.

Thanks

-Cheung

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Old   March 2, 2009, 08:23
Default Re: Type of meshing
  #2
mange
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divide your domain into several smaller sub volumes (rectangular shape). With some patience and luck you can then mesh using hexahedral cells and stretching. Hopefully you can then satisfy the need of small cells at your "area of interest" while keeping cell count at a minimum.

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Old   March 3, 2009, 03:33
Default Re: Type of meshing
  #3
Nishikant Tamrakar
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you can also see this site: http://www.fluent.com/software/sf_me...l_cylinder.htm

this is for flow past cylinder , but you can use the approach for meshing.

Good luck.
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Old   March 3, 2009, 14:41
Default Re: Type of meshing
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Cheung
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What should if I want to reduce or minimise the number of highly skewed elements in my volume mesh?

Thanks -Cheung
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Old   March 4, 2009, 06:41
Default Re: Type of meshing
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Cheung
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Sorry for the typo..

What I meant was -What should I do if I want to reduce or minimise the number of highly skewed elements in my volume mesh?

Thanks -Cheung
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Old   March 6, 2009, 00:14
Default Re: Type of meshing
  #6
Ganapathy
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IF you do proper subdividing of the geometry, you will not get any skewed elements. your inner cube has 6 faces. So divide the domain into 6 parallelepiped's using these faces. The remaining place will be filled by other parallelepiped's

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Old   March 6, 2009, 13:22
Default Re: Type of meshing
  #7
Cheung
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Hi, I'm sorry for asking this.

But can you elaborate more because I don't really understand what you meant. The cube inside the tunnel is resting on the floor of the tunnel, that's just for additional information.

Sorry for the hassle.

Thank you in advance.

Cheung.
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Old   March 6, 2009, 13:42
Default Re: Type of meshing
  #8
Ganapathy Iyer
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Lets say its a 2D case. You can always extend it to 3D. The cube (Square in 2D) will rest on the Floor. The tunnel will be a huge rectangle on which the Square will be resting. So the Square will sub-divide the rectangle into 5 other rectangles. Three of these will be formed by the sides of the Square. The other two will be the rectangles in the empty spaces. After this subdivision, you can control the mesh using a sizing function on the edges and create a beautiful hex mesh.

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