Fluent Adjoint Method Operation Type Observable Crashing Fluent

- May 27, 2022 at 5:37 am
  
  eklein12
  Subscriber
  
  Hello,
  I have been Fluent's adjoint solver to optimize flow over a bank of tubes with great success. However, recently I attempted to use an operation type as my observable (before I was using just a basic observable type). By using a linear combination, when I attempt to run the adjoint calculation and get the sensitivities I get many errors and fluent terminates (Please see error below). For some reason, defining any operation type (ratio, linear combination, etc) causes this issue. Also, I have managed to replicate the error sometimes by clicking the "evaluate" button on the observables tab. It doesn't always happen, but every once in a while it does.
  Any help on this issue is much appreciated! Thank You!
  Error [node 6] [time 5/27/22 1:9:34] Abnormal Exit!
  Node 6 Fatal signal raised sig = Segmentation fault
  26f380d0 CX_Primitive_Error
  da5f0cc0 seh_filter_exe
  26facc40 logical_right_shift
  cc13ec50 _C_specific_handler
  dc811f80 _chkstk
  dc7c1020 RtlRaiseException
  dc810ba0 KiUserExceptionDispatcher
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  2907c880 adjoint_get_advancement_defaults
  29071910 cost_value_adjoint
  29071910 cost_value_adjoint
  250fa5f0 AF_Allocate_Face_Child_Tree_Dump
  26f980c0 eval
  250c2d90 PRF_Command_Start
  250c55b0 PRF_Node_repl
  250c5e80 init_rsubrs
  26facc40 logical_right_shift
  dbdb7020 BaseThreadInitThunk
  dc7c2630 RtlUserThreadStart
- July 11, 2022 at 2:31 pm
  
  Murari Iyengar
  Ansys Employee
  
  Hi, please check your setup and definitions. If this is a 3D case, I recommend trying a 2D case first.
- December 1, 2022 at 5:24 pm
  
  eklein12
  Subscriber
  
  Hello,
  Sorry for the late reply, but thank you for the feedback. I was using a 2D case to begin with. Interestingly I found the issue was that in the definition of the linear combination you cannot make the first coefficient a negative number. I switched the ordering so the observable with the positive coefficient was listed first and the error went away.

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