Limit to the amount of FFD boxes?
 

Hi,

For my master-thesis I am deviding a wing up in multiple spanwise sections and for each section I would like to create a separate FFD-box. However, when I introduce more FFD boxes than 10 I get the "segmentation fault" error while running SU2_DEF in FFD_SETTING mode (regardless of the level I put the FFD boxes in). When I get this error no FFD information is added to the .su2 output mesh.

When I use 10 boxes or less everything works perfectly fine.

Is there a hard limit (10?) to the amount of FFD-boxes introduced to one mesh file?

Thanks in advance,

JanH

SU2 imposes a limit at "const unsigned int MAX_NUMBER_FFD = 10; /*!< \brief Maximum number of FFDBoxes for the FFD. */" (line 110) in option_structure.hpp inside the Include folder of SU2_Def. You can just go in and change the hard coded limit yourself.

Hi,


I have tried changing the FFD limit as mentioned by Mr. Andrw by editing option_structure.hpp. But I am still getting an error while trying to create more than 10 FFD boxes on a mesh. Could someone please help me out?


Regards
Shreyas

Hi Shreyas,


What error are you getting exactly? I dont know much about the FFD boxes, but may be able to help on the coding side.


Wally

Hi Wally,


On trying to create more than 10 FFD boxes I am getting the below error message:
Attachment 72797


Regards
Shreyas

Hi Shreyas,

So the code is giving a segfault, which most likely means the MAX_NUMBER_FFD is likely mismatched. How many FFD boxes are you trying to create?


Looking at the develop branch, MAX_NUMBER_FFD = 15 (option_structure.hpp in SU2_CFD/include/). So theoretically you should be able to run 15 FFD boxes.



Are you using the python scripts? There may be some issue with these conflicting.

Sorry I am not more help here.



Wally

Hi Wally,


Yes, theoretically I should be able to create up to 15 FFD boxes. But I am able to create only up to 10 boxes (even though MAX_NUMBER_FFD is set to 15 in option_structure.hpp in SU2_CFD/include/ folder). On trying to create anything more than 10 FFDs, I am getting the error. I even tried increasing the MAX_NUMBER_FFD to 50, but still i am getting the same error.


No, I am not using any python scripts. I am using SU2_DEF to set the FFD boxes. Is there any other way to achieve this? Do you think there is any other location where the FFD limit is set and needs to be changed?



Regards
Shreyas

Hi Shreyas,

Could you please post your config file so we can have a look? It's hard to tell from your output where exactly the issue is, so maybe running with valgrind could provide more information.

Looking at the config structure, it looks like the variable nFFDBox is set by both the FFD_DEFINITION and FFD_DEGREE options, so perhaps one of these isn't being set properly and they're defined for different numbers of FFD boxes?

Cheers,
Brian

Dear Brian,


Sorry, the information I provided was partially incorrect. I was actually trying to create more than 15 FFD's after changing the MAX_NUMBER_FFD to 50 in option_structure.hpp in SU2_CFD/include/ folder.

Below is the config file which I used while trying to create 16 FFD boxes:


% ----------------------- BOUNDARY CONDITION DEFINITION -----------------------%
MARKER_EULER = ( WING_TIP, WING_LOWER, WING_UPPER )
MARKER_FAR = ( WALL_INFLOW, WALL_LOWER, WALL_OUTFLOW, WALL_OUTER, WALL_UPPER )
MARKER_SYM = ( SYMMETRY_PLANE )
MARKER_PLOTTING = ( WING_TIP, WING_LOWER, WING_UPPER )
MARKER_MONITORING = ( WING_TIP, WING_LOWER, WING_UPPER )
MARKER_DESIGNING = ( WING_TIP, WING_LOWER, WING_UPPER )
% ------------------------- INPUT/OUTPUT INFORMATION --------------------------%
MESH_FILENAME= mesh.su2
MESH_FORMAT= SU2
MESH_OUT_FILENAME= mesh_MBSCB.su2
% -------------------- FREE-FORM DEFORMATION PARAMETERS -----------------------%n
FFD_TOLERANCE= 1E-10
FFD_ITERATIONS= 500
FFD_DEFINITION= (SCB1, 2.9, 0, 0.51, 6.45, 0, 0.51, 6.5, 0.7925, 0.5587, 3.2437, 0.7925, 0.5587, 2.9, 0, 0, 6.45, 0, 0, 6.5, 0.7925, 0.08, 3.2437, 0.7925, 0.08); SCB2, 3.243700000000000e+00, 7.925000000000000e-01, 5.587000000000000e-01, 6.500000000000000e+00, 7.925000000000000e-01, 5.587000000000000e-01, 6.550000000000000e+00, 1.585100000000000e+00, 6.075000000000000e-01, 3.587500000000000e+00, 1.585100000000000e+00, 6.075000000000000e-01, 3.243700000000000e+00, 7.925000000000000e-01, 8.000000000000000e-02, 6.500000000000000e+00, 7.925000000000000e-01, 8.000000000000000e-02, 6.550000000000000e+00, 1.585100000000000e+00, 1.600000000000000e-01, 3.587500000000000e+00, 1.585100000000000e+00, 1.600000000000000e-01); (SCB3, 3.587500000000000e+00, 1.585100000000000e+00, 6.075000000000000e-01, 6.550000000000000e+00, 1.585100000000000e+00, 6.075000000000000e-01, 6.600000000000000e+00, 2.377700000000000e+00, 6.562000000000000e-01, 3.931300000000000e+00, 2.377700000000000e+00, 6.562000000000000e-01, 3.587500000000000e+00, 1.585100000000000e+00, 1.600000000000000e-01, 6.550000000000000e+00, 1.585100000000000e+00, 1.600000000000000e-01, 6.600000000000000e+00, 2.377700000000000e+00, 2.400000000000000e-01, 3.931300000000000e+00, 2.377700000000000e+00, 2.400000000000000e-01); (SCB4, 3.931300000000000e+00, 2.377700000000000e+00, 6.562000000000000e-01, 6.600000000000000e+00, 2.377700000000000e+00, 6.562000000000000e-01, 6.650000000000000e+00, 3.170200000000000e+00, 7.050000000000000e-01, 4.275000000000000e+00, 3.170200000000000e+00, 7.050000000000000e-01, 3.931300000000000e+00, 2.377700000000000e+00, 2.400000000000000e-01, 6.600000000000000e+00, 2.377700000000000e+00, 2.400000000000000e-01, 6.650000000000000e+00, 3.170200000000000e+00, 3.200000000000000e-01, 4.275000000000000e+00, 3.170200000000000e+00, 3.200000000000000e-01); (SCB5, 4.275000000000000e+00, 3.170200000000000e+00, 7.050000000000000e-01, 6.650000000000000e+00, 3.170200000000000e+00, 7.050000000000000e-01, 6.700000000000000e+00, 3.962700000000000e+00, 7.538000000000000e-01, 4.618800000000000e+00, 3.962700000000000e+00, 7.538000000000000e-01, 4.275000000000000e+00, 3.170200000000000e+00, 3.200000000000000e-01, 6.650000000000000e+00, 3.170200000000000e+00, 3.200000000000000e-01, 6.700000000000000e+00, 3.962700000000000e+00, 4.000000000000000e-01, 4.618800000000000e+00, 3.962700000000000e+00, 4.000000000000000e-01); (SCB6, 4.618800000000000e+00, 3.962700000000000e+00, 7.538000000000000e-01, 6.700000000000000e+00, 3.962700000000000e+00, 7.538000000000000e-01, 6.750000000000000e+00, 4.755300000000000e+00, 8.025000000000000e-01, 4.962500000000000e+00, 4.755300000000000e+00, 8.025000000000000e-01, 4.618800000000000e+00, 3.962700000000000e+00, 4.000000000000000e-01, 6.700000000000000e+00, 3.962700000000000e+00, 4.000000000000000e-01, 6.750000000000000e+00, 4.755300000000000e+00, 4.800000000000000e-01, 4.962500000000000e+00, 4.755300000000000e+00, 4.800000000000000e-01); (SCB7, 4.962500000000000e+00, 4.755300000000000e+00, 8.025000000000000e-01, 6.750000000000000e+00, 4.755300000000000e+00, 8.025000000000000e-01, 6.800000000000000e+00, 5.547800000000000e+00, 8.512999999999999e-01, 5.306300000000000e+00, 5.547800000000000e+00, 8.512999999999999e-01, 4.962500000000000e+00, 4.755300000000000e+00, 4.800000000000000e-01, 6.750000000000000e+00, 4.755300000000000e+00, 4.800000000000000e-01, 6.800000000000000e+00, 5.547800000000000e+00, 5.600000000000001e-01, 5.306300000000000e+00, 5.547800000000000e+00, 5.600000000000001e-01); (SCB8, 5.306300000000000e+00, 5.547800000000000e+00, 8.512999999999999e-01, 6.800000000000000e+00, 5.547800000000000e+00, 8.512999999999999e-01, 6.850000000000000e+00, 6.340400000000000e+00, 9.000000000000000e-01, 5.650000000000000e+00, 6.340400000000000e+00, 9.000000000000000e-01, 5.306300000000000e+00, 5.547800000000000e+00, 5.600000000000001e-01, 6.800000000000000e+00, 5.547800000000000e+00, 5.600000000000001e-01, 6.850000000000000e+00, 6.340400000000000e+00, 6.400000000000000e-01, 5.650000000000000e+00, 6.340400000000000e+00, 6.400000000000000e-01); (SCB9, 5.650000000000000e+00, 6.340400000000000e+00, 9.000000000000000e-01, 6.850000000000000e+00, 6.340400000000000e+00, 9.000000000000000e-01, 7.054200000000000e+00, 7.012000000000000e+00, 9.833000000000000e-01, 5.870800000000000e+00, 7.012000000000000e+00, 9.833000000000000e-01, 5.650000000000000e+00, 6.340400000000000e+00, 6.400000000000000e-01, 6.850000000000000e+00, 6.340400000000000e+00, 6.400000000000000e-01, 7.054200000000000e+00, 7.012000000000000e+00, 7.325000000000000e-01, 5.870800000000000e+00, 7.012000000000000e+00, 7.325000000000000e-01); (SCB10, 5.870800000000000e+00, 7.012000000000000e+00, 9.833000000000000e-01, 7.054200000000000e+00, 7.012000000000000e+00, 9.833000000000000e-01, 7.258300000000000e+00, 7.683700000000000e+00, 1.066700000000000e+00, 6.091700000000000e+00, 7.683700000000000e+00, 1.066700000000000e+00, 5.870800000000000e+00, 7.012000000000000e+00, 7.325000000000000e-01, 7.054200000000000e+00, 7.012000000000000e+00, 7.325000000000000e-01, 7.258300000000000e+00, 7.683700000000000e+00, 8.250000000000000e-01, 6.091700000000000e+00, 7.683700000000000e+00, 8.250000000000000e-01); (SCB11, 6.091700000000000e+00, 7.683700000000000e+00, 1.066700000000000e+00, 7.258300000000000e+00, 7.683700000000000e+00, 1.066700000000000e+00, 7.462500000000000e+00, 8.355300000000000e+00, 1.150000000000000e+00, 6.312500000000000e+00, 8.355300000000000e+00, 1.150000000000000e+00, 6.091700000000000e+00, 7.683700000000000e+00, 8.250000000000000e-01, 7.258300000000000e+00, 7.683700000000000e+00, 8.250000000000000e-01, 7.462500000000000e+00, 8.355300000000000e+00, 9.175000000000000e-01, 6.312500000000000e+00, 8.355300000000000e+00, 9.175000000000000e-01); (SCB12, 6.312500000000000e+00, 8.355300000000000e+00, 1.150000000000000e+00, 7.462500000000000e+00, 8.355300000000000e+00, 1.150000000000000e+00, 7.666700000000000e+00, 9.026899999999999e+00, 1.233300000000000e+00, 6.533300000000000e+00, 9.026899999999999e+00, 1.233300000000000e+00, 6.312500000000000e+00, 8.355300000000000e+00, 9.175000000000000e-01, 7.462500000000000e+00, 8.355300000000000e+00, 9.175000000000000e-01, 7.666700000000000e+00, 9.026899999999999e+00, 1.010000000000000e+00, 6.533300000000000e+00, 9.026899999999999e+00, 1.010000000000000e+00); (SCB13, 6.533300000000000e+00, 9.026899999999999e+00, 1.233300000000000e+00, 7.666700000000000e+00, 9.026899999999999e+00, 1.233300000000000e+00, 7.870800000000000e+00, 9.698600000000001e+00, 1.316700000000000e+00, 6.754200000000000e+00, 9.698600000000001e+00, 1.316700000000000e+00, 6.533300000000000e+00, 9.026899999999999e+00, 1.010000000000000e+00, 7.666700000000000e+00, 9.026899999999999e+00, 1.010000000000000e+00, 7.870800000000000e+00, 9.698600000000001e+00, 1.102500000000000e+00, 6.754200000000000e+00, 9.698600000000001e+00, 1.102500000000000e+00); (SCB14, 6.754200000000000e+00, 9.698600000000001e+00, 1.316700000000000e+00, 7.870800000000000e+00, 9.698600000000001e+00, 1.316700000000000e+00, 8.074999999999999e+00, 1.037020000000000e+01, 1.400000000000000e+00, 6.975000000000000e+00, 1.037020000000000e+01, 1.400000000000000e+00, 6.754200000000000e+00, 9.698600000000001e+00, 1.102500000000000e+00, 7.870800000000000e+00, 9.698600000000001e+00, 1.102500000000000e+00, 8.074999999999999e+00, 1.037020000000000e+01, 1.195000000000000e+00, 6.975000000000000e+00, 1.037020000000000e+01, 1.195000000000000e+00); (SCB15, 6.975000000000000e+00, 1.037020000000000e+01, 1.400000000000000e+00, 8.074999999999999e+00, 1.037020000000000e+01, 1.400000000000000e+00, 8.279199999999999e+00, 1.104180000000000e+01, 1.483300000000000e+00, 7.195800000000000e+00, 1.104180000000000e+01, 1.483300000000000e+00, 6.975000000000000e+00, 1.037020000000000e+01, 1.195000000000000e+00, 8.074999999999999e+00, 1.037020000000000e+01, 1.195000000000000e+00, 8.279199999999999e+00, 1.104180000000000e+01, 1.287500000000000e+00, 7.195800000000000e+00, 1.104180000000000e+01, 1.287500000000000e+00); (SCB16, 7.195800000000000e+00, 1.104180000000000e+01, 1.483300000000000e+00, 8.279199999999999e+00, 1.104180000000000e+01, 1.483300000000000e+00, 8.483300000000000e+00, 1.171350000000000e+01, 1.566700000000000e+00, 7.416700000000000e+00, 1.171350000000000e+01, 1.566700000000000e+00, 7.195800000000000e+00, 1.104180000000000e+01, 1.287500000000000e+00, 8.279199999999999e+00, 1.104180000000000e+01, 1.287500000000000e+00, 8.483300000000000e+00, 1.171350000000000e+01, 1.380000000000000e+00, 7.416700000000000e+00, 1.171350000000000e+01, 1.380000000000000e+00)
FFD_DEGREE= (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1); (9,4,1)
FFD_CONTINUITY= 2ND_DERIVATIVE
FFD_SYMMETRY_PLANE= YES
% ---------------------- DESIGN VARIABLE PARAMETERS --------------------------%
DV_MARKER= ( WING_TIP, WING_LOWER, WING_UPPER )
DV_KIND= FFD_SETTING
DV_PARAM= 1
DV_VALUE= 0





The terminal result and error was as follows:
Attachment 72836
Here you can see than FFD limit has been correctly changed:
Attachment 72834
Is there any other location where I need to change the limit, in order to be able to create more than 15 FFD boxes?



Regards
Shreyas

Hi Shreyas,

Just to be sure before we try to debug this, did you recompile the code after changing the limit?

Cheers,
Pedro