Dear Dr. Henshaw,
As you know I am trying to generate interpolation data between a 3-D
twisted blade and a cartesian background grid. However, the hole that I am
getting from Ogen is not desired on. It creates hole in the background grid
as if the twisted blade has a leakage at the inlet and outlet. The
situation is even worse when I use explicit interpolation.
I have attached the image files which show the hole cut in the background
grid generated by the blade. I have tried different parameters where if a
change improves interpolation it is included for further test cases and if
it worsens interpolation it is discarded. The used parameters are:
1. cell centered: interpolation fails
2. vertex centered: better interpolation
3. ghost points: no effect once increased beyond 5
4. discretization width: increasing this results in worse interpolation
5. interpolate ghost points: no improvement
6. explicit/implicit interpolation: implicit works better, but I can not
use implicit interpolation because of the limitation of the flow solver I
am using.
7. Interpolation width: no improvement
8. quality bound: increasing quality bound worsens interpolation
9. Maximize overlap: interpolation fails
10. minimize overlap: default
11. reducing minimum overlap: no improvement
12. high order interpolation: interpolation worsens (2nd order works better)
13. Using Boundary adjustment: results in not much improvement.
The command file reads:
create mappings
read plot3d file
Outerbox_le.grd
read plot3d file
Stator_extended_le.grd
change a mapping
Outerbox_le.grd-grid0
boundary conditions
1,1,1,1,1,1
exit
change a mapping
Stator_extended_le.grd-grid0
boundary conditions
-1,-1,1,0,0,0
exit
exit this menu
generate an overlapping grid
Outerbox_le.grd-grid0
Stator_extended_le.grd-grid0
change parameters
prevent hole cutting
all
all
done
allow hole cutting
Outerbox_le.grd-grid0
Stator_extended_le.grd-grid0
done
cell centering
vertex centered for all grids
ghost points
all
10,10,10,10,10,10
interpolation type
explicit for all grids
* exit
* compute overlap
* exit
*save grid in plot3d format
*stator_background_4.grd
Please have a look and please let me know if you have some suggestions
about certain parameters, which combination of parameters should I try to
have a higher chance of success.
Thanks,
Ashish
--
Regards,
Ashish Mishra
Graduate Student
*Specialization: Computational Aeroacoustics*
Aerospace Engineering Department
University of Illinois at Urbana-Champaign
Urbana, Illinois, 61801
USA
phone: +1-217-819-6389
email: mishra7@xxxxxxxxxxxx
Attachment:
blade_cut_explicit.bmp
Description: Windows bitmap
Attachment:
blade_cut_Implicit.bmp
Description: Windows bitmap
