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January 24, 2016, 15:02 |
Stop after first iteration
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#1 |
Member
Massachusetts
Join Date: Jun 2015
Posts: 46
Rep Power: 10 |
hello,
I'm running the shape optimization to minimize the drag of a NACA airfoil. I used the configuration present in the test cases and i substituted the native mesh with my own mesh, but i don't know why the process stops after the first iteration. Any idea about the source of the problem? Also i don't understand what is the scale factor of the objective function. Thanks for help |
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January 24, 2016, 16:03 |
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#2 |
Member
Massachusetts
Join Date: Jun 2015
Posts: 46
Rep Power: 10 |
i read the the force_breakdown.dat in the DIRECT folder prduced by the first step of the optimization and i noticed all the values are zero (CL, CD etc.), so this is the problem that stops the optimization at the first step. I don't think is a mesh problem because i run the same mesh and run correctly in the direct simulation, so i think is the .cfg
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January 24, 2016, 16:16 |
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#3 |
Member
Massachusetts
Join Date: Jun 2015
Posts: 46
Rep Power: 10 |
Maybe i found the problem
here a screen of my terminal http://i.imgur.com/mcJPray.jpg It seems i did a mistake in the "initial guess of indipendent variables". Honestly i have no idea whis is the right manner to set di parameters |
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January 25, 2016, 16:36 |
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#4 |
Member
Massachusetts
Join Date: Jun 2015
Posts: 46
Rep Power: 10 |
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January 26, 2016, 04:29 |
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#5 |
Super Moderator
Tim Albring
Join Date: Sep 2015
Posts: 195
Rep Power: 10 |
Hi kayla1994,
you can have a look into DESIGNS/DSN_002/log_Direct.out to see why it fails. |
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January 27, 2016, 12:35 |
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#6 | |
Member
Massachusetts
Join Date: Jun 2015
Posts: 46
Rep Power: 10 |
Quote:
this is the message in log_DIRECT.out \ !!! Error !!! NACA5512_2_deform.cgns is not a CGNS file. Now exiting... \ NACA5512_2 is the name of my mesh in cgns format You can find the part of the .cfg file that contains the INPUT/PUTPUT information at this link http://imgur.com/8G2Ls3p Maybe it can help Thanks for help |
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February 19, 2016, 02:06 |
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#7 |
Super Moderator
Francisco Palacios
Join Date: Jan 2013
Location: Long Beach, CA
Posts: 404
Rep Power: 15 |
Hi Kayla,
Please keep in mind that the shape design of SU2 only works with .su2 format (not cgns). This is because the grid deformation tool are not able to write the deformed grid in cgns format. Best, Francisco Palacios |
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