[ICEM] Result of the meshing of a swirl injector

pipolaki · August 10, 2012, 13:50

Hello,

This topic follows this one : http://www.cfd-online.com/Forums/ans...-strategy.html

I have finished the mesh of my swirl injector and I want to share my results with you in order to receive your advice and your critics, especially concerning the quality of the mesh. I remind you that I'm new in ICEM so do not hesitate to give me basic advices if you think it would help me to improve my mesh.

The tin file is here :https://sites.google.com/site/alfred...edirects=0&d=1

1) First of all, you will find some views of my blocking strategy.

2) Then there is the mesh and a focus on one of the more critical area regarding the quality of the mesh.

3) At the end of the topic, you will find some quality graphs. I've heard on another topic that the most important criteria are the "angle", the "determinant" and the "orthogonality".
For the angle, it is advised that the angle MUST be over 9° and only some elements between 9° and 18° are accepted. The determinant MUST be over 0,1. I put the result for the skweness for information. What do you think of all this results ?

Thanks for your help.

Far · August 10, 2012, 14:33

I cannot see the pics...

pipolaki · August 10, 2012, 14:43

Sorry. It should be OK now.

Far · August 11, 2012, 05:18

Your blocking seems very good.

I have some other quick ideas for blocking this geometry.

1. Model it as quarter model with two symmetries. Later on you copy/rotate to reproduce the exact symmetric 360 model as shown below.

2. Insert ogrid around the injector holes in the two circular regions between two concentric circles. Similarly inside the injector holes throughout the injector hole and into the circular region between two concentric circles (Fig 8)

3. I am struggling to put the quarter o-grid inside the small circular region which exits into the plenum through interface

What do you think about this approach?

pipolaki · August 11, 2012, 14:42

Working with the symmetry function is a good idea because it's a way for me to discover a feature I don't know.

When I look on fig. 6, it seems there is interpenetration of blocks in the swirl chamber. Is it the case ? If yes, it can be a problem ?

Far · August 11, 2012, 15:12

Yes, there is penetration of blocks in swirl chamber. It is due to fact 180 deg block (square section ) in swirl chamber and I am unable to get the one quarter. So when copied all blocks to 90 deg and repeated twice to get the 360 model, I have duplicate blocks (180+180+180+180). It is to be noted that in all other blocks I get the 90 deg sector easily.

PS. After creation of main block, I have rotated it by 45 deg.

August 10, 2012, 13:50	Result of the meshing of a swirl injector	#1
pipolaki New Member Join Date: Jul 2012 Location: France Posts: 26 Rep Power: 14	Hello, This topic follows this one : http://www.cfd-online.com/Forums/ans...-strategy.html I have finished the mesh of my swirl injector and I want to share my results with you in order to receive your advice and your critics, especially concerning the quality of the mesh. I remind you that I'm new in ICEM so do not hesitate to give me basic advices if you think it would help me to improve my mesh. The tin file is here :https://sites.google.com/site/alfred...edirects=0&d=1 1) First of all, you will find some views of my blocking strategy. 2) Then there is the mesh and a focus on one of the more critical area regarding the quality of the mesh. 3) At the end of the topic, you will find some quality graphs. I've heard on another topic that the most important criteria are the "angle", the "determinant" and the "orthogonality". For the angle, it is advised that the angle MUST be over 9° and only some elements between 9° and 18° are accepted. The determinant MUST be over 0,1. I put the result for the skweness for information. What do you think of all this results ? Thanks for your help. Last edited by pipolaki; August 10, 2012 at 14:41.

August 10, 2012, 14:33		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	I cannot see the pics... pipolaki likes this.

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August 10, 2012, 14:43		#3
pipolaki New Member Join Date: Jul 2012 Location: France Posts: 26 Rep Power: 14	Sorry. It should be OK now.

August 11, 2012, 05:18		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Your blocking seems very good. I have some other quick ideas for blocking this geometry. 1. Model it as quarter model with two symmetries. Later on you copy/rotate to reproduce the exact symmetric 360 model as shown below. 2. Insert ogrid around the injector holes in the two circular regions between two concentric circles. Similarly inside the injector holes throughout the injector hole and into the circular region between two concentric circles (Fig 8) 3. I am struggling to put the quarter o-grid inside the small circular region which exits into the plenum through interface What do you think about this approach?

August 11, 2012, 14:42		#5
pipolaki New Member Join Date: Jul 2012 Location: France Posts: 26 Rep Power: 14	Working with the symmetry function is a good idea because it's a way for me to discover a feature I don't know. When I look on fig. 6, it seems there is interpenetration of blocks in the swirl chamber. Is it the case ? If yes, it can be a problem ?

August 11, 2012, 15:12		#6
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Yes, there is penetration of blocks in swirl chamber. It is due to fact 180 deg block (square section ) in swirl chamber and I am unable to get the one quarter. So when copied all blocks to 90 deg and repeated twice to get the 360 model, I have duplicate blocks (180+180+180+180). It is to be noted that in all other blocks I get the 90 deg sector easily. PS. After creation of main block, I have rotated it by 45 deg.