[ICEM] Blocking Strategy for Intersecting Tapered Cylinders

scribby182 · December 11, 2012, 12:29

All,

I have a part that is a curved surface with a tapered cylinder extruded from the airfoil. I am looking to make a structured mesh in ICEM to use for 3D CFD. The geometry is periodic, so each extrusion mates with the neighboring extrusion in the flowpath. Image 1 shows a top-down view, simplified view of this mating (in black) with an example of the periodic boundary for the domain (in red). Image 2 shows a solid model on the intersecting tapered cylinders.

The problem I have is with the curve made by the mating surface (curve along the intersection between neighboring parts). This curve is not aligned with the flow or the periodic boundary. I'm not sure what the best blocking strategy to capture this would be. I can't simply merge the surfaces, as because the cylinders are tapered there is a corner formed at the curve between the two parts. But, as far as I understand, if I don't have an edge associated to that curve, the geometry in that region will not be captured.

The only thing I could think of for blocking was to create a quarter o-grid. Images 3-5 show different iterations of this (I've omitted the other edges in the region and only shown the ones directly related to the o-grid). The first two images show o-grids on one side of the curve or the other, the third with one on each side. The problem with these is that I think the areas indicated by circles will have distorted elements. Is this a suitable blocking strategy, or are there others that people can suggest that would work better?

Thanks very much for any help you can provide,

Scribby182

http://postimage.org/image/akwpz83l7/
http://postimage.org/image/bogub6o8b/
http://postimage.org/image/h1aa321ij/
http://postimage.org/image/dw662qm5t/
http://postimage.org/image/en2zffctl/

EDIT: Sorry, missed two things:
1) I should have said these were cylinders effectively in crossflow (as flow is going through the channel)
2) Sorry, but I can not post any geometry/ICEM files.

energy382 · December 13, 2012, 08:20

Quote:

Originally Posted by scribby182

2) Sorry, but I can not post any geometry/ICEM files.

sorry, but I can't help you without that files

scribby182 · December 17, 2012, 10:02

Sorry, the geometry is proprietary so I really can't post anything more than the general descriptions. Thanks.

Scribby182

December 11, 2012, 12:29	Blocking Strategy for Intersecting Tapered Cylinders	#1
scribby182 New Member Join Date: Jan 2012 Posts: 10 Rep Power: 14	All, I have a part that is a curved surface with a tapered cylinder extruded from the airfoil. I am looking to make a structured mesh in ICEM to use for 3D CFD. The geometry is periodic, so each extrusion mates with the neighboring extrusion in the flowpath. Image 1 shows a top-down view, simplified view of this mating (in black) with an example of the periodic boundary for the domain (in red). Image 2 shows a solid model on the intersecting tapered cylinders. The problem I have is with the curve made by the mating surface (curve along the intersection between neighboring parts). This curve is not aligned with the flow or the periodic boundary. I'm not sure what the best blocking strategy to capture this would be. I can't simply merge the surfaces, as because the cylinders are tapered there is a corner formed at the curve between the two parts. But, as far as I understand, if I don't have an edge associated to that curve, the geometry in that region will not be captured. The only thing I could think of for blocking was to create a quarter o-grid. Images 3-5 show different iterations of this (I've omitted the other edges in the region and only shown the ones directly related to the o-grid). The first two images show o-grids on one side of the curve or the other, the third with one on each side. The problem with these is that I think the areas indicated by circles will have distorted elements. Is this a suitable blocking strategy, or are there others that people can suggest that would work better? Thanks very much for any help you can provide, Scribby182 http://postimage.org/image/akwpz83l7/ http://postimage.org/image/bogub6o8b/ http://postimage.org/image/h1aa321ij/ http://postimage.org/image/dw662qm5t/ http://postimage.org/image/en2zffctl/ EDIT: Sorry, missed two things: 1) I should have said these were cylinders effectively in crossflow (as flow is going through the channel) 2) Sorry, but I can not post any geometry/ICEM files. Last edited by scribby182; December 11, 2012 at 13:46.

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December 17, 2012, 10:02		#3
scribby182 New Member Join Date: Jan 2012 Posts: 10 Rep Power: 14	Sorry, the geometry is proprietary so I really can't post anything more than the general descriptions. Thanks. Scribby182