Icem cfd and fluent

Patrick_18 · November 17, 2018, 09:12

I have doubt about icem cfd. I did (geometry-airfoil)mesh in icem cfd and uploaded in fluent and while put on run mode divergence is found. I have already done simulation of this same airfoil geometry .(did mesh in ansys). No divergence is found in ansys simulation.
What is reason behind it ?
Please provide appropriate solution.

Gert-Jan · November 20, 2018, 03:58

I ran fluent with ansys meshes and icem meshes. There is no fundamental diffference. However, fluent is not very forgiven with respect to bad meshes. (For that reason I prefer CFX.) So, probably the ICEM mesh is of bad quality. But where the differences are.......? Impossible to say with the information you provided. I receommend to open both in Post simultaneously to see where the differences are.

Did you you check the mesh on errors in ICEM (mostly surface orientation errors)? Did you see an error popping up upon export to fluent?

Patrick_18 · November 20, 2018, 04:46

I did not find any error in icem mesh and while exporting file in fluent

Gert-Jan · November 20, 2018, 05:03

Did you smooth the mesh? What is your lowest quality?

Patrick_18 · November 20, 2018, 05:44

IMG_20181120_154824091_HDR.jpg

IMG_20181120_154815855_HDR.jpg

IMG_20181120_154922711_HDR.jpg

Here first two are photos of quality and last one is photo of orthogonal quality.

Gert-Jan · November 20, 2018, 06:01

The lowest value is not a very good idea in Fluent. You need at least 0.01.
So, you need to smooth the mesh, or modify the geometry & the blocking to obtain something better.

If you don't know where the problem is, you can use your RMB on the bar of the worst elements in the histogram to create a subset, which you can visualise.

Patrick_18 · November 20, 2018, 06:11

I will try for mesh quality improvement.

November 17, 2018, 09:12	Icem cfd and fluent	#1
Patrick_18 New Member Pratik Join Date: Oct 2018 Posts: 11 Rep Power: 7	I have doubt about icem cfd. I did (geometry-airfoil)mesh in icem cfd and uploaded in fluent and while put on run mode divergence is found. I have already done simulation of this same airfoil geometry .(did mesh in ansys). No divergence is found in ansys simulation. What is reason behind it ? Please provide appropriate solution.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[TurboGrid] turbogrid to icem cfd then icem cfd to fluent	tmeysam92	ANSYS Meshing & Geometry	0	May 7, 2014 06:25
Export mesh from ICEM CFD for Fluent	summerdream	ANSYS	2	September 10, 2013 12:12
Transport mesh from ICEM CFD, to Fluent, to Sysnoise	Wieland	FLUENT	2	April 15, 2012 06:28
Dimension conflict between icem cfd and fluent	highhopes	ANSYS Meshing & Geometry	1	September 9, 2011 11:07
[ICEM] Export unstructured periodic mesh from ICEM CFD to Fluent	ivanddd	ANSYS Meshing & Geometry	1	February 3, 2011 00:51

November 20, 2018, 03:58		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	I ran fluent with ansys meshes and icem meshes. There is no fundamental diffference. However, fluent is not very forgiven with respect to bad meshes. (For that reason I prefer CFX.) So, probably the ICEM mesh is of bad quality. But where the differences are.......? Impossible to say with the information you provided. I receommend to open both in Post simultaneously to see where the differences are. Did you you check the mesh on errors in ICEM (mostly surface orientation errors)? Did you see an error popping up upon export to fluent?

November 20, 2018, 04:46		#3
Patrick_18 New Member Pratik Join Date: Oct 2018 Posts: 11 Rep Power: 7	I did not find any error in icem mesh and while exporting file in fluent

November 20, 2018, 05:03		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	Did you smooth the mesh? What is your lowest quality?

November 20, 2018, 05:44		#5
Patrick_18 New Member Pratik Join Date: Oct 2018 Posts: 11 Rep Power: 7	IMG_20181120_154824091_HDR.jpg IMG_20181120_154815855_HDR.jpg IMG_20181120_154922711_HDR.jpg Here first two are photos of quality and last one is photo of orthogonal quality.

November 20, 2018, 06:01		#6
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	The lowest value is not a very good idea in Fluent. You need at least 0.01. So, you need to smooth the mesh, or modify the geometry & the blocking to obtain something better. If you don't know where the problem is, you can use your RMB on the bar of the worst elements in the histogram to create a subset, which you can visualise.

November 20, 2018, 06:11		#7
Patrick_18 New Member Pratik Join Date: Oct 2018 Posts: 11 Rep Power: 7	I will try for mesh quality improvement.