[xucz]

I want to repeat ADODG case 5 by SU2, which is a shape optimization of CRM wing with volume and thickness constraints. However, I have several problems about the calculation of SU2_GEO and the FFD box setting.
1. The calcuation of CRM wing geometry by SU2_GEO seems wrong. I have the CRM wing grids generated by our group and downloaded from Martins's MDO lab. However, when using SU2_GEO to calculate the volume and max_thickness of the CRM wing, I get the wrong value.

TITLE = "SU2_GEO Evaluation"
VARIABLES = "WING_VOLUME","WING_MIN_THICKNESS","WING_MAX_THICK NESS","WING_MIN_CHORD","WING_MAX_CHORD","WING_MIN_ LE_RADIUS","WING_MAX_LE_RADIUS","WING_MIN_TOC","WI NG_MAX_TOC","WING_OBJFUN_MIN_TOC","WING_MAX_TWIST" ,"WING_MAX_CURVATURE","WING_MAX_DIHEDRAL","STATION 1_AREA","STATION2_AREA","STATION3_AREA","STATION4_ AREA","STATION5_AREA","STATION6_AREA","STATION1_TH ICKNESS","STATION2_THICKNESS","STATION3_THICKNESS" ,"STATION4_THICKNESS","STATION5_THICKNESS","STATIO N6_THICKNESS","STATION1_CHORD","STATION2_CHORD","S TATION3_CHORD","STATION4_CHORD","STATION5_CHORD"," STATION6_CHORD","STATION1_LE_RADIUS","STATION2_LE_ RADIUS","STATION3_LE_RADIUS","STATION4_LE_RADIUS", "STATION5_LE_RADIUS","STATION6_LE_RADIUS","STATION 1_TOC","STATION2_TOC","STATION3_TOC","STATION4_TOC ","STATION5_TOC","STATION6_TOC","STATION1_TWIST"," STATION2_TWIST","STATION3_TWIST","STATION4_TWIST", "STATION5_TWIST","STATION6_TWIST"
ZONE T= "Geometrical variables (value)"
2.60267e-07, 1e+06, 0, 0.141274, 0.141274, 0.0815384, 0.0815384, 1e+06, 0, 1e+06, 1.27545, 0, 0, 0.0671577, 0.0146626, 2.20173e-07, 3.80453e-11, 1.59892e-05, 0.000126335, 0.0683589, 0.181668, 0, 0, 0, 0, 1.63725, 0.560246, 0.00511909, 0.00109078, 0.316937, 0.437188, 0.528651, 3.52095, 0.577668, 0.751952, 0.104392, 0.52388, 0.0417522, 0.324264, 0, 0, 0, 0, 3.53881, -4.94267, 41.2086, 88.2659, 3.32486, -3.6125

Why? Could anyone know this?

2. Using SU2_DEF to set FFD box. Shall we generate Body-fitted FFD box or combine more FFDboxes together?

[darshangowda046]

Can u send me msh anf cfg file so that i canrun it and check it for u

[angupraveen]

Hello,

I am also facing a similar issue. I'm working on the optimization of a BWB aircraft. Unfortunately, every time I run SU2_GEO to determine the wing thickness for constraints, I get wrong values. The thickness is in the order of 5-6 meters.

Is there a fix to this problem??

Kind regards

Angu

[yuezehua]

Originally Posted by angupraveen

Hello,

I am also facing a similar issue. I'm working on the optimization of a BWB aircraft. Unfortunately, every time I run SU2_GEO to determine the wing thickness for constraints, I get wrong values. The thickness is in the order of 5-6 meters.

Is there a fix to this problem??

Kind regards

Angu

have you solved this problem? if so, please tell me how to deal with this problem, thanks a lot!!

[angupraveen]

My issue was pretty straight forward. I figured out what the issue was. Since the dimensions are relative, you need to define a set of geometric stations from your Center (0'0'0). Give the station distance in Y direction and then run SU2_GEO.

If you still have any doubts. Feel free to ask

Regards

Angu

[yuezehua]

Originally Posted by angupraveen

My issue was pretty straight forward. I figured out what the issue was. Since the dimensions are relative, you need to define a set of geometric stations from your Center (0'0'0). Give the station distance in Y direction and then run SU2_GEO.

If you still have any doubts. Feel free to ask

Regards

Angu

thanks a lot my bro!

actucally, i'm working on an ONERAM6 wing optimization project, which is an offical example from SU2 website, name as [Constrained shape design of a transonic inviscid wing at a cte. CL]

while using the files in the offical package, it works well, but when i using the mesh file made by POINTWISE(the mesh is created by myself, in a structured mesh form), it failed.

afrer calling SU2_DEF, i tried call SU2_GEO to make the cutting planes, just same as mentioned in the tutorial. But the output showes that the thickness, the chord length or the skewness angle are all incorrect, when i checking the output file “wing_slice.dat” by TECPLOT, it showes a series of wrong slices as shown below.

i think i have to note that, the geometry model i used is downloaded from NACA offical website, so the geometric problem may not be the coordinate problem. So i am really really confusedhttps://www.cfd-online.com/Forums/images/smilies/confused.gif https://www.cfd-online.com/Forums/im...s/confused.gif

maybe can you give me your email address so we can talk some details~?

and a really big thanks to you !
thanks a loooooooot!

p.s. i found i cant upload my picture
anyway, the wing_slices.dat showes a "wing-like", but a really mess state

[wallym]

Hi Yuezehua,


Thanks for using SU2. I am no expert with the SU2_DEF and SU2_GEO stuff but i figured i would offer a thought. You mentioned creating a structured mesh, which may be the problem. The routines in these binaries were probably made/tested using unstructured meshes. That being said, this is just my assumption.


A test to check this is the case would be to use Pointwise's diagonalize function to make your mesh unstructured.


Hope this helps!
Wally