[ANSYS Meshing] Expanding Mesh Size

Sphagnum · July 15, 2015, 16:45

Hi all,

Say that I have a 2d simulation with just a rectangle. I'd like to have the mesh be very fine near the bottom of the rectangle, and become increasingly larger as we move in the positive y direction. How is this done in fluent? The only thing I've found so far is the inflation method, but that isn't doing quite what I want- I ultimately need a triangular mesh and inflation always seems to force it to be rectangular.

Any and all input is much appreciated. Thanks!

hwet · July 15, 2015, 18:17

Maybe trias with bias meshing, read the tutorials on this available on Ansys customer portal. i am sure i have read about doing this before.

Kapi · July 15, 2015, 18:57

Hi sphagnum,

As hwet suggested, giving Bias factor on vertical edges will make sure you have fine mesh at start and coarse mesh at top depending on which Bias type you choose.

I am not sure about fluent but in
"Ansys Meshing>Use Advance Size Function> On proximity and Curvature" helps in achieving the same result with Given growth rate(depends on your size of your geometry)

Cheers
KAPI

Sphagnum · July 15, 2015, 20:29

Ahhh yes, I thought there was something I was forgetting from the tutorials I had done. Thank you very much for the help.

Sphagnum · July 16, 2015, 15:42

Hi all,
So I've been adding an edge sizing with bias factor, but that only expands the mesh close to the edge. Is there a way to change this so that it applies to the entirety of the rectangle?

Thanks again!

Kapi · July 16, 2015, 19:11

Give a higher "Bias Factor" and it will cover your whole geometry!

July 15, 2015, 16:45	Expanding Mesh Size	#1
Sphagnum New Member Join Date: Jun 2015 Posts: 14 Rep Power: 10	Hi all, Say that I have a 2d simulation with just a rectangle. I'd like to have the mesh be very fine near the bottom of the rectangle, and become increasingly larger as we move in the positive y direction. How is this done in fluent? The only thing I've found so far is the inflation method, but that isn't doing quite what I want- I ultimately need a triangular mesh and inflation always seems to force it to be rectangular. Any and all input is much appreciated. Thanks! Last edited by Sphagnum; July 15, 2015 at 16:51. Reason: typo

July 15, 2015, 18:17		#2
hwet Senior Member Join Date: Mar 2014 Posts: 375 Rep Power: 13	Maybe trias with bias meshing, read the tutorials on this available on Ansys customer portal. i am sure i have read about doing this before. Suzuki likes this.

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July 15, 2015, 18:57		#3
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 14	Hi sphagnum, As hwet suggested, giving Bias factor on vertical edges will make sure you have fine mesh at start and coarse mesh at top depending on which Bias type you choose. I am not sure about fluent but in "Ansys Meshing>Use Advance Size Function> On proximity and Curvature" helps in achieving the same result with Given growth rate(depends on your size of your geometry) Cheers KAPI

July 15, 2015, 20:29		#4
Sphagnum New Member Join Date: Jun 2015 Posts: 14 Rep Power: 10	Ahhh yes, I thought there was something I was forgetting from the tutorials I had done. Thank you very much for the help.

July 16, 2015, 15:42		#5
Sphagnum New Member Join Date: Jun 2015 Posts: 14 Rep Power: 10	Hi all, So I've been adding an edge sizing with bias factor, but that only expands the mesh close to the edge. Is there a way to change this so that it applies to the entirety of the rectangle? Thanks again!

July 16, 2015, 19:11		#6
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 14	Give a higher "Bias Factor" and it will cover your whole geometry!