Hello everyone,
I encountered a possible inconsistency when setting the concentration boundary condition for species transport in LS-DYNA.
The keyword *ICFD_BOUNDARY_PRESCRIBED_ appears differently in the LS-PrePost keyword interface and in the LS-DYNA manual.
In LS-PrePost, the keyword is shown as a two-line structure:
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the first line defines the PID
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the second line contains the LCID values
However, in the LS-DYNA manual, the keyword is documented in a single-line format where PID, LCID and CONC fields appear together.
Because of this difference, I observed the following behaviour:
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If I follow the format shown in LS-PrePost, the solver produces an error:
forrtl: severe (64)
and the simulation cannot start.
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Even if I instead follow the manual format and remove the second line, the simulation runs but the concentration boundary condition does not seem to be applied. In this case:
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the inlet concentration remains zero
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residuals for the scalar transport equation are not computed
I also noticed a similar mismatch for another keyword related to species transport:
*ICFD_MODEL_SPECIES_TRANSPORTwhere the format in the LS-PrePost interface does not fully match the manual description.
Because of this inconsistency I am currently unable to run simulations that require inlet concentration boundary conditions for species transport.
Could anyone clarify:
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The correct keyword format
*ICFD_BOUNDARY_PRESCRIBED_SPTRANSP_CONC -
whether this difference between LS-PrePost and the manual is expected
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or if this might be a bug?
My LS-DYNA version: R16 SMP and LS-PrePost version: 4.12.6Thank you so so so much for any guidance!
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