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Multiple FFD box definition for shape optimization study |
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October 28, 2013, 01:19 |
Multiple FFD box definition for shape optimization study
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#1 |
Member
Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 13 |
Hi,
I intend to run shape optimization study for a flying wing configuration for which I need to define 2 FFD box definitions. I have defined the FFD box parameters as Code:
FFD_NBOX= 2 FFD_NLEVEL= 1 FFD_TAG= 0 FFD_LEVEL= 0 FFD_DEGREE_I= 5 FFD_DEGREE_J= 4 FFD_DEGREE_K= 1 FFD_PARENTS= 0 FFD_CHILDREN= 0 FFD_CORNER_POINTS= 8 -10.0 0.0 -30 160 -130 -30 440 -130 -30 520 0.0 -30 -10.0 0.0 70 160 -130 70 440 -130 70 520 0.0 70 FFD_CONTROL_POINTS= 0 FFD_SURFACE_POINTS= 0 FFD_TAG= 1 FFD_LEVEL= 0 FFD_DEGREE_I= 5 FFD_DEGREE_J= 4 FFD_DEGREE_K= 1 FFD_PARENTS= 0 FFD_CHILDREN= 0 FFD_CORNER_POINTS= 8 160 -130 -30 480 -370 -30 580 -300 -30 440 -130 -30 160 -130 70 480 -370 70 580 -300 70 440 -130 70 FFD_CONTROL_POINTS= 0 FFD_SURFACE_POINTS= 0 I want to know the meaning of the FFD terms like FFD_NLEVEL, FFD_LEVEL, FFD_PARENTS, FFD_CHILDREN etc. and what values should to be taken for multiple FFD box definitions. Also, for how to define the FFD parameters for the 2 FFD boxes in the DEFINITION_DV option in the .cfg file ? Thanks Anant |
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November 5, 2013, 17:46 |
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#2 |
Super Moderator
Thomas D. Economon
Join Date: Jan 2013
Location: Stanford, CA
Posts: 271
Rep Power: 14 |
Hi Anant,
Thanks for the post. In terms of the extra options for the FFD boxes (LEVEL, PARENTS, CHILDREN, etc.), these are new features for defining nested FFD boxes (one inside another) so that you can more easily perform large scale and local deformations to your geometry. We will prepare more documentation on these features soon. As for defining FFD control point variables on multiple boxes, note the format of the DV specification in the config_template.cfg file: FFD_CONTROL_POINT ( FFD Tag, i_Ind, j_Ind, k_Ind, x_Disp, y_Disp, z_Disp ) The corresponding FFD box for a particular control point is given by the FFD Tag. This is the first entry for each control point variable. Hope this helps, Tom |
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