getfc-1

A made-up case for checking suspected bugs by running YREC: testsuite/Test_m2p0_feh+0p0_vzams150_IES1_TAMS at 7be4133, with the changes below as diffs against that case (removed lines red, added green, the words that differ shaded darker); besides these, only the head and the output names differ. Its head says what it is:

getfc-1: getfc.f bug 1.
From YREC 7be4133, testsuite/Test_m2p0_feh+0p0_vzams150_IES1_TAMS: a 2 Msun main-sequence A star rotating at 150 km/s on the ZAMS, run to the TAMS.
Changed (each with its source):
LVFC = .TRUE.: docs/source/namelist_physics.md lists it under "Experimental options" ("Zahn 1991 variable-FC model");
YREC's own namelists, this case's included, call it "Not recommended (disables FC setting.)", so this case runs a documented but discouraged option,
and the mixing no longer uses the case's FC = 0.033 as a constant factor.
and the output names. Nothing else.

getfc-1.nml1 (0 setting lines changed from testsuite/Test_m2p0_feh+0p0_vzams150_IES1_TAMS.nml1; download the whole file)

Unchanged.

getfc-1.nml2 (1 setting line changed from testsuite/Test_m2p0_feh+0p0_vzams150_IES1_TAMS.nml2; download the whole file)

@@ YREC's line 230, this file's line 237 @@
 
  FW = 1.0 ! Global factor for scaling the angular momentum transport diffusion coefficients.
  FC = 0.033 ! Scale factor for mixing diffusion coefficeints relative to angular momentum. Typicaly calibrated to match Li depletion in a benchmark (cluster stars or the Sun).
- LVFC = .FALSE. ! Implements FC as a variable, using the Zahn 1991 approach. Not recommended (disables FC setting.)
+ LVFC = .TRUE. ! bug check: docs/source/namelist_physics.md, Experimental options; YREC's namelists say "Not recommended". Was: Implements FC as a variable, using the Zahn 1991 approach. Not recommended (disables FC setting.)
  IGSF = 1 ! Toggle for the stability condition used to evaluate the GSF and ABCD instabilties. 1 is recommended.
  RCRIT = 1000.0 ! Critical Reynolds number for the onset of the shear instability.
  FES = 1.0D0 ! Factor for scaling the angular momentum transport diffusion coefficients for Eddington-Sweet circulation relative to default.