O-grid ICEMCFD

kg1913 · August 28, 2014, 08:46

Could someone tell me what is wrong with my O-grid? or how to fix it please?

apoorv · August 28, 2014, 10:29

Hi, Check Associations for egdes and surfaces. I think blocking may not have been projected to surface.

Far · August 29, 2014, 03:47

either you have deleted block or face projection (which is done by default by ICEM) is not properly done. In case of later problem, do the manual face to surface association.

kg1913 · August 29, 2014, 07:13

Thank you. If I do the face association, Ill get the following.. I don't think this is what you meant me to do right ? :S

Far · September 1, 2014, 03:15

share files

kg1913 · September 1, 2014, 04:53

I have attached the file

Ralen · September 1, 2014, 05:53

The geometry file (*.tin) is needed. Not only the project file *.prj.

kg1913 · September 1, 2014, 06:12

attached..

Ralen · September 1, 2014, 06:52

Why the aluminium plate have null thickness (canal into the atmoshere have null length)? The results may be more reaslitic.

kg1913 · September 1, 2014, 08:18

Initially I had a thickness. But I was advised not to have it. (thickness= 0.417499996721745).

Ralen · September 2, 2014, 00:42

Something like that.

kg1913 · September 2, 2014, 03:52

That looks great. Thank you very much

could you tell me how you did this, please (step by step instruction if possible please)? I really would like to know how I can do this. (looking at it did, I guess you created another square cut blocking around the circle --> two o-grids?)

kg1913 · September 2, 2014, 11:52

I have decreased the step size, so the cantilever is closer to the top surface. For some reason, even with correct asccociation etc., it does not allow it to run in CFXpre. It gives me the following error. I had the exact same problem with another model. (Initial model will run in CFXpre, however after changing only slighly it gives me the error). I did check mesh as well.

+--------------------------------------------------------------------+
| ERROR #002100012 has occurred in subroutine Out_NegVol. |
| Message: |
| A negative ELEMENT volume has been detected. This is a fatal |
| error and execution will be terminated. The location of the first |
| negative volume is reported below. |
| Volume : -0.2492E-12 |
| Location : ( 0.20377E-01, 0.13189E-01, -0.12460E-03) |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver could not be started, or exited with return |
| code 255. No results file has been created. |
+--------------------------------------------------------------------+

End of solution stage.

This run of the ANSYS CFX Solver has finished.

Thank you.

Ralen · September 10, 2014, 05:14

Create 3D Block.
1. Split block (prescribed point if possible)
2. Split block (prescribed point if possible)
3. Create O-Grid
4. Associate edges to curves (also I associate all inner vertices to appropriate points)
5. Move vertices

Ralen · September 10, 2014, 05:16

6. Create O-Grid
7. Associate faces to surface OUTLET
My project is not ready for CFX. May require more associations (faces and edges).

Ralen · September 10, 2014, 05:56

For flow around the plate cells are too big.

September 2, 2014, 11:52	Changing geometry --> Error Out_NegVol.	#13
kg1913 New Member Join Date: Jul 2014 Posts: 22 Rep Power: 11	I have decreased the step size, so the cantilever is closer to the top surface. For some reason, even with correct asccociation etc., it does not allow it to run in CFXpre. It gives me the following error. I had the exact same problem with another model. (Initial model will run in CFXpre, however after changing only slighly it gives me the error). I did check mesh as well. +--------------------------------------------------------------------+ \| ERROR #002100012 has occurred in subroutine Out_NegVol. \| \| Message: \| \| A negative ELEMENT volume has been detected. This is a fatal \| \| error and execution will be terminated. The location of the first \| \| negative volume is reported below. \| \| Volume : -0.2492E-12 \| \| Location : ( 0.20377E-01, 0.13189E-01, -0.12460E-03) \| +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ \| An error has occurred in cfx5solve: \| \| \| \| The ANSYS CFX solver could not be started, or exited with return \| \| code 255. No results file has been created. \| +--------------------------------------------------------------------+ End of solution stage. This run of the ANSYS CFX Solver has finished. Thank you.

September 10, 2014, 05:56		#16
Ralen Member Andrey Join Date: Sep 2011 Posts: 86 Rep Power: 16	For flow around the plate cells are too big. Last edited by Ralen; September 10, 2014 at 06:58.

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August 28, 2014, 10:29		#2
apoorv Member A. S. Join Date: Apr 2009 Location: Raipur (INDIA) Posts: 54 Rep Power: 17	Hi, Check Associations for egdes and surfaces. I think blocking may not have been projected to surface.

September 1, 2014, 03:15		#5
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	share files

September 1, 2014, 05:53		#7
Ralen Member Andrey Join Date: Sep 2011 Posts: 86 Rep Power: 16	The geometry file (.tin) is needed. Not only the project file .prj.

September 1, 2014, 06:52		#9
Ralen Member Andrey Join Date: Sep 2011 Posts: 86 Rep Power: 16	Why the aluminium plate have null thickness (canal into the atmoshere have null length)? The results may be more reaslitic.

September 1, 2014, 08:18		#10
kg1913 New Member Join Date: Jul 2014 Posts: 22 Rep Power: 11	Initially I had a thickness. But I was advised not to have it. (thickness= 0.417499996721745).

September 2, 2014, 03:52		#12
kg1913 New Member Join Date: Jul 2014 Posts: 22 Rep Power: 11	That looks great. Thank you very much could you tell me how you did this, please (step by step instruction if possible please)? I really would like to know how I can do this. (looking at it did, I guess you created another square cut blocking around the circle --> two o-grids?)