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AUTO GRID could not intersect layers

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Old   January 1, 2022, 13:02
Angry AUTO GRID could not intersect layers
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vahid
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Hi dears

i have impeller cad model and wanna mesh it in autogrid.
used import cad model box to define my geometry.

hub, shr .LE and TE seems ok . i also link blade surfaces .
geometry check is also ok . it create flow channel also but doesn't make 3d mesh and i got attached errors :


the error ask for increasing "intersection precision check ratio "
but i can not find it in Autogrid at all !!!


pls check attached photos
i really need help
thanks dear
Attached Images
File Type: png error.png (4.0 KB, 2 views)
File Type: png 3d.png (65.2 KB, 5 views)
File Type: png mer view.png (20.9 KB, 7 views)
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Old   January 2, 2022, 00:37
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Hamid Zoka
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Hi;
According to attached image, mid-layers at the outlet are quite concentrated while the first cell thickness is very large. Try reducing the first cell thickness at least to the order of 10^(-5) m. Also try to restrict the impact of boundary layer mesh to 30% of span. This will remove the concentration of cells at mean-line section.

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Old   January 2, 2022, 04:04
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Quote:
Originally Posted by Hamidzoka View Post
Hi;
According to attached image, mid-layers at the outlet are quite concentrated while the first cell thickness is very large. Try reducing the first cell thickness at least to the order of 10^(-5) m. Also try to restrict the impact of boundary layer mesh to 30% of span. This will remove the concentration of cells at mean-line section.

Best
Thank you for your reply dear
decreasing the wall cell width, didn't work.
Attached Images
File Type: jpg wall width.JPG (65.7 KB, 4 views)
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Old   January 2, 2022, 04:07
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Quote:
Originally Posted by Hamidzoka View Post
Hi;
According to attached image, mid-layers at the outlet are quite concentrated while the first cell thickness is very large. Try reducing the first cell thickness at least to the order of 10^(-5) m. Also try to restrict the impact of boundary layer mesh to 30% of span. This will remove the concentration of cells at mean-line section.

Best
do you know how i can find" intersection precision check ratio" ?
Attached Images
File Type: jpg error.JPG (24.1 KB, 0 views)
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Old   January 2, 2022, 04:30
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Quote:
Originally Posted by Hamidzoka View Post
Hi;
According to attached image, mid-layers at the outlet are quite concentrated while the first cell thickness is very large. Try reducing the first cell thickness at least to the order of 10^(-5) m. Also try to restrict the impact of boundary layer mesh to 30% of span. This will remove the concentration of cells at mean-line section.

Best
as you can see in attached photos, hub doesnot intersect blade near TE .
I used blade expansion in hub, but dont know why its failing !!!

appreciate your kind help dear
Attached Images
File Type: jpg hub and blade near TE.JPG (43.5 KB, 2 views)
File Type: jpg hub and blade near LE.JPG (49.4 KB, 2 views)
File Type: jpg BLADE EXPAMSION FAIL.JPG (108.2 KB, 3 views)
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Old   January 2, 2022, 05:01
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Hi;
check the geometry. Maybe there is an unwanted deformation that interrupts meshing process. Also check if airfoil intersects the whole hub curve. make sure that intersection is true all over the hub curve. If the geometry is smooth, expansion will solve the intersection problem.
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Old   January 4, 2022, 05:16
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Quote:
Originally Posted by Hamidzoka View Post
Hi;
check the geometry. Maybe there is an unwanted deformation that interrupts meshing process. Also check if airfoil intersects the whole hub curve. make sure that intersection is true all over the hub curve. If the geometry is smooth, expansion will solve the intersection problem.
thank you so much dear for your helps

i solved that . now i have other issue.
when i link cad model and add spiliter, flowpath created but when click on 3D mesh generation, suddenly emergency save or recovery warning raise and close autogrid !!!

i can not understand it. geometry check is ok , flow-path ok but ...


would you pls help me about it ?
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File Type: jpg recover error.jpg (117.2 KB, 1 views)
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