Mesh Refinement

Natali_Beginner · April 30, 2013, 20:02

Hello guys,
I am wondering why I cannot reach to a stable and unchanged results when I am doing mesh refinement in many steps. Now, I refined the mesh almost 7 times smaller but th changes are huge compared with the last step.
Really thanks,
Natali

blackmask · April 30, 2013, 20:42

Do you use the first-order discretization? If so, please use second order discretization.

Natali_Beginner · April 30, 2013, 20:46

Quote:

Originally Posted by blackmask

Do you use the first-order discretization? If so, please use second order discretization.

I am using 2nd order.

stuart23 · May 1, 2013, 02:30

How small is your mesh? You could be picking up transients in the flow. Maybe switch to the transient solver with a small timestep?

Far · May 1, 2013, 03:50

Quote:

Originally Posted by Natali_Beginner

Hello guys,
I am wondering why I cannot reach to a stable and unchanged results when I am doing mesh refinement in many steps. Now, I refined the mesh almost 7 times smaller but th changes are huge compared with the last step.
Really thanks,
Natali

What was the size of initial mesh and refined mesh?

What type of flow you are analysing?

April 30, 2013, 20:02	Mesh Refinement	#1
Natali_Beginner New Member Natali Join Date: Apr 2013 Posts: 21 Rep Power: 13	Hello guys, I am wondering why I cannot reach to a stable and unchanged results when I am doing mesh refinement in many steps. Now, I refined the mesh almost 7 times smaller but th changes are huge compared with the last step. Really thanks, Natali

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April 30, 2013, 20:42		#2
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 21	Do you use the first-order discretization? If so, please use second order discretization.

May 1, 2013, 02:30		#4
stuart23 Senior Member Stuart Buckingham Join Date: May 2010 Location: United Kingdom Posts: 267 Rep Power: 25	How small is your mesh? You could be picking up transients in the flow. Maybe switch to the transient solver with a small timestep?