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[ICEM] Meshing a Rocket Injector Assembly

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Old   January 6, 2014, 17:30
Default Meshing a Rocket Injector Assembly
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Ashis Ghosh
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Hi There,

I'm creating a mesh for an injector assembly to be used in a hybrid rocket. I will eventually export the mesh to use with OpenFoam.

With the mesh featured in the pictures I achieved a non-orthogonality of 85, which is much to high to obtain usable results.

To create the mesh I set up the line mesh for all the edges to achieve that orthogonal appearance that you can see on the outside. However, I do not know how I can replicate that for the inside. I've tried the various types of meshing methods available between octree and hexa dominant.

As this is my first serious project with ICEM-CFD I am still highly inexperienced. Any advice or tips would be welcome.

cutmesh.PNG

fulloutside.PNG

closeoutside.PNG

model.jpg

Thanks.
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Old   January 7, 2014, 01:09
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Sijal Ahmed Memon (turboenginner@gmail.com)
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you are using ICEM HEXA?
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Old   January 18, 2014, 15:29
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Upon trying that, I get the following:

Cut view:
full.jpg

Close up:
close.PNG

The max non-orthogonality increased from 85-89, but the average went down to 17 from 29.

However, this time it failed to checkMesh checks from OpenFoam for skewness.

Any suggestions?

Thanks!
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Old   January 19, 2014, 04:06
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Sijal Ahmed Memon (turboenginner@gmail.com)
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i would recommend you to use hexa method
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Old   January 19, 2014, 06:13
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Can you share your geometry?
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Old   January 19, 2014, 12:54
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I used the hexa-dominant method - is that different from the HEXA method? I am a bit confused with all of this.


Here's my geometry as a .STEP file.

InjFlow.zip

Thanks!
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Old   January 19, 2014, 13:03
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yes both are different.

Hexa dominant is for FEA and ICEM CFD HEXA is for CFD and uses blocking.
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Old   January 21, 2014, 06:06
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Hi Ashis,

I have uploaded the files in the dropbox
https://www.dropbox.com/s/spsxctmlz9zui38/InFlowShared.zip

You can refine further if u want.


Regards,
Raghav
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Last edited by raghav; January 21, 2014 at 07:12.
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Old   February 5, 2014, 01:52
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Thank you very much - this will be a great help!

Where would I be able to learn how to do it to this degree? I tried many times to achieve the same thing. Could you explain your blocking strategy?

Again, much thanks!
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Old   March 7, 2014, 01:40
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Hi Ashis,

It will come by practice. I used
1. Combo of Bottom-Up and Top-Down approach.
2. Used O-Grids in Tandem
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