Aspect Ratio, Quality of element (Range)

Peyman_m · July 29, 2014, 12:29

Hi
I dont khow the good range of aspect ratio quality for hexahedral elements, can you help me?
thanks in advance

colinda1 · August 4, 2014, 02:39

Dear Peyman,

Depends. In some critical areas of high flow field gradients you may want ideally to aim for an aspect ratio of 1. On the other hand in other regions and depending on the solver you are using, you could accept aspect ratios as high as 5000.

A mesh dependency study is important to know what should be used in your case or best practices on your type of application, if available.

Best regards,
Colinda

Peyman_m · August 4, 2014, 18:17

thanks Dear colinda for your suggestion.
I mean the acceptable aspect ratio In FLUENT

sidaero · June 2, 2015, 13:31

Do no of cells and no of elements of a mesh mean the same?
I am quite a beginner to icem cfd and in the process of learning the mesh independence study.. Will be very grateful for your answers
thank you

Peyman_m · June 3, 2015, 01:43

Dear sidaero
yes, cells and elements are same.

sidaero · June 3, 2015, 14:38

Thank you.. Got it..

chem.engr · November 10, 2015, 04:16

Hi, I want to know that how to reduce the maximum aspect ratio if you have very minimal flow rate of gas and what should be the best minimum and maximum aspect ratio range?

colinda1 · November 10, 2015, 08:00

Hi,

The optimal is an aspect ratio of 1. But this is in most cases hard to obtain without exploding the number of grid points. The maximum aspect ratio the solver can deal with depends on the solver you are using. Often guidelines are provided for each solver in its documentation. The method to reduce the maximum aspect ratio depends on the meshing technique being used. For example in a structured grid increasing the number of grid points as well as their distribution (clustering) may help to reduce the maximum aspect ratio.

July 29, 2014, 12:29	Aspect Ratio, Quality of element (Range)	#1
Peyman_m New Member Peyman Join Date: Jul 2013 Location: Iran Posts: 29 Rep Power: 12	Hi I dont khow the good range of aspect ratio quality for hexahedral elements, can you help me? thanks in advance

August 4, 2014, 18:17		#3
Peyman_m New Member Peyman Join Date: Jul 2013 Location: Iran Posts: 29 Rep Power: 12	thanks Dear colinda for your suggestion. I mean the acceptable aspect ratio In FLUENT Last edited by Peyman_m; August 7, 2014 at 02:19.

June 2, 2015, 13:31	doubt	#4
sidaero New Member Siddharth Budaraju Join Date: Apr 2015 Posts: 6 Rep Power: 11	Do no of cells and no of elements of a mesh mean the same? I am quite a beginner to icem cfd and in the process of learning the mesh independence study.. Will be very grateful for your answers thank you

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August 4, 2014, 02:39		#2
colinda1 Senior Member Colinda Join Date: May 2012 Location: Brussels Posts: 151 Rep Power: 13	Dear Peyman, Depends. In some critical areas of high flow field gradients you may want ideally to aim for an aspect ratio of 1. On the other hand in other regions and depending on the solver you are using, you could accept aspect ratios as high as 5000. A mesh dependency study is important to know what should be used in your case or best practices on your type of application, if available. Best regards, Colinda

June 3, 2015, 01:43		#5
Peyman_m New Member Peyman Join Date: Jul 2013 Location: Iran Posts: 29 Rep Power: 12	Dear sidaero yes, cells and elements are same.

June 3, 2015, 14:38		#6
sidaero New Member Siddharth Budaraju Join Date: Apr 2015 Posts: 6 Rep Power: 11	Thank you.. Got it..

November 10, 2015, 04:16		#7
chem.engr New Member Join Date: Oct 2015 Posts: 9 Rep Power: 10	Hi, I want to know that how to reduce the maximum aspect ratio if you have very minimal flow rate of gas and what should be the best minimum and maximum aspect ratio range?

November 10, 2015, 08:00		#8
colinda1 Senior Member Colinda Join Date: May 2012 Location: Brussels Posts: 151 Rep Power: 13	Hi, The optimal is an aspect ratio of 1. But this is in most cases hard to obtain without exploding the number of grid points. The maximum aspect ratio the solver can deal with depends on the solver you are using. Often guidelines are provided for each solver in its documentation. The method to reduce the maximum aspect ratio depends on the meshing technique being used. For example in a structured grid increasing the number of grid points as well as their distribution (clustering) may help to reduce the maximum aspect ratio.