Rename VISC_REM bugfix parameters

VISC_REM_TIMESTEP_FIX -> VISC_REM_TIMESTEP_BUG VISC_REM_BT_WEIGHT_FIX -> VISC_REM_BT_WEIGHT_BUG The "signs" of the flags are flipped accordingly.
NOAA-GFDL · Nov 5, 2024 · 341caf4 · 341caf4
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Showing 3 changed files with 33 additions and 35 deletions.
diff --git a/src/core/MOM_barotropic.F90 b/src/core/MOM_barotropic.F90
@@ -289,7 +289,7 @@ module MOM_barotropic
   logical :: tidal_sal_flather !< Apply adjustment to external gravity wave speed
                              !! consistent with tidal self-attraction and loading
                              !! used within the barotropic solver
-  logical :: wt_uv_fix       !< If true, use a normalized wt_[uv] for vertical averages.
+  logical :: wt_uv_bug = .true. !< If true, recover a bug that wt_[uv] that is not normalized.
   type(time_type), pointer :: Time  => NULL() !< A pointer to the ocean models clock.
   type(diag_ctrl), pointer :: diag => NULL()  !< A structure that is used to regulate
                              !! the timing of diagnostic output.
@@ -1070,7 +1070,7 @@ subroutine btstep(U_in, V_in, eta_in, dt, bc_accel_u, bc_accel_v, forces, pbce,
     wt_v(i,J,k) = CS%frhatv(i,J,k) * visc_rem
   enddo ; enddo ; enddo
 
-  if (CS%wt_uv_fix) then
+  if (.not. CS%wt_uv_bug) then
     do j=js,je ; do I=is-1,ie ; Iwt_u_tot(I,j) = wt_u(I,j,1) ; enddo ; enddo
     do k=2,nz ; do j=js,je ; do I=is-1,ie
       Iwt_u_tot(I,j) = Iwt_u_tot(I,j) + wt_u(I,j,k)
@@ -4652,11 +4652,10 @@ subroutine barotropic_init(u, v, h, eta, Time, G, GV, US, param_file, diag, CS,
   if (.not.GV%Boussinesq) CS%answer_date = max(CS%answer_date, 20230701)
 
   call get_param(param_file, mdl, "VISC_REM_BUG", visc_rem_bug, default=.true., do_not_log=.true.)
-  call get_param(param_file, mdl, "VISC_REM_BT_WEIGHT_FIX", CS%wt_uv_fix, &
-                 "If true, use a normalized weight function for vertical averages of "//&
-                 "baroclinic velocity and forcing. Default of this flag is set by "//&
-                 "VISC_REM_BUG. This flag should be used with VISC_REM_TIMESTEP_FIX.", &
-                 default=.not.visc_rem_bug)
+  call get_param(param_file, mdl, "VISC_REM_BT_WEIGHT_BUG", CS%wt_uv_bug, &
+                 "If true, recover a bug in barotropic solver that uses an unnormalized weight "//&
+                 "function for vertical averages of baroclinic velocity and forcing. Default "//&
+                 "of this flag is set by VISC_REM_BUG.", default=visc_rem_bug)
   call get_param(param_file, mdl, "TIDES", use_tides, &
                  "If true, apply tidal momentum forcing.", default=.false.)
   if (use_tides .and. present(HA_CSp)) CS%HA_CSp => HA_CSp

diff --git a/src/core/MOM_dynamics_split_RK2.F90 b/src/core/MOM_dynamics_split_RK2.F90
@@ -178,7 +178,8 @@ module MOM_dynamics_split_RK2
   logical :: debug_OBC !< If true, do debugging calls for open boundary conditions.
   logical :: fpmix = .false.                 !< If true, applies profiles of momentum flux magnitude and direction.
   logical :: module_is_initialized = .false. !< Record whether this module has been initialized.
-  logical :: visc_rem_dt_fix = .false. !<If true, use dt rather than dt_pred for vertvisc_rem at the end of predictor.
+  logical :: visc_rem_dt_bug = .true. !< If true, recover a bug that uses dt_pred rather than dt for vertvisc_rem
+                                      !! at the end of predictor.
 
   !>@{ Diagnostic IDs
   integer :: id_uold   = -1, id_vold   = -1
@@ -736,10 +737,10 @@ subroutine step_MOM_dyn_split_RK2(u_inst, v_inst, h, tv, visc, Time_local, dt, f
     call start_group_pass(CS%pass_uvp, G%Domain, clock=id_clock_pass)
     call cpu_clock_begin(id_clock_vertvisc)
   endif
-  if (CS%visc_rem_dt_fix) then
-    call vertvisc_remnant(visc, CS%visc_rem_u, CS%visc_rem_v, dt, G, GV, US, CS%vertvisc_CSp)
-  else
+  if (CS%visc_rem_dt_bug) then
     call vertvisc_remnant(visc, CS%visc_rem_u, CS%visc_rem_v, dt_pred, G, GV, US, CS%vertvisc_CSp)
+  else
+    call vertvisc_remnant(visc, CS%visc_rem_u, CS%visc_rem_v, dt, G, GV, US, CS%vertvisc_CSp)
   endif
   call cpu_clock_end(id_clock_vertvisc)
 
@@ -1439,16 +1440,14 @@ subroutine initialize_dyn_split_RK2(u, v, h, tv, uh, vh, eta, Time, G, GV, US, p
                  default=.false.)
   call get_param(param_file, mdl, "VISC_REM_BUG", visc_rem_bug, &
                  "If true, visc_rem_[uv] in split mode is incorrectly calculated or accounted "//&
-                 "for in three places. This parameter controls the defaults of three individual "//&
-                 "flags, VISC_REM_TIMESTEP_FIX in MOM_dynamics_split_RK2(b), "//&
-                 "VISC_REM_BT_WEIGHT_FIX in MOM_barotropic, and VISC_REM_CONT_HVEL_FIX in "//&
-                 "MOM_continuity_PPM. Eventually, the three individual flags should be removed "//&
-                 "after tests and the default of VISC_REM_BUG should be to False.", default=.true.)
-  call get_param(param_file, mdl, "VISC_REM_TIMESTEP_FIX", CS%visc_rem_dt_fix, &
-                 "If true, use dt rather than dt_pred in vertvisc_remnant() at the end of "//&
-                 "predictor stage for the following continuity() call and btstep() call "//&
-                 "in the corrector step. This flag should be used with "//&
-                 "VISC_REM_BT_WEIGHT_FIX.", default=.not.visc_rem_bug)
+                 "for in two places. This parameter controls the defaults of two individual "//&
+                 "flags, VISC_REM_TIMESTEP_BUG in MOM_dynamics_split_RK2(b) and "//&
+                 "VISC_REM_BT_WEIGHT_BUG in MOM_barotropic.", default=.true.)
+  call get_param(param_file, mdl, "VISC_REM_TIMESTEP_BUG", CS%visc_rem_dt_bug, &
+                 "If true, recover a bug that uses dt_pred rather than dt in "//&
+                 "vertvisc_remnant() at the end of predictor stage for the following "//&
+                 "continuity() and btstep() calls in the corrector step. Default of this flag "//&
+                 "is set by VISC_REM_BUG", default=visc_rem_bug)
 
   allocate(CS%taux_bot(IsdB:IedB,jsd:jed), source=0.0)
   allocate(CS%tauy_bot(isd:ied,JsdB:JedB), source=0.0)

diff --git a/src/core/MOM_dynamics_split_RK2b.F90 b/src/core/MOM_dynamics_split_RK2b.F90
@@ -175,7 +175,8 @@ module MOM_dynamics_split_RK2b
   logical :: debug_OBC !< If true, do debugging calls for open boundary conditions.
   logical :: fpmix = .false.                 !< If true, applies profiles of momentum flux magnitude and direction.
   logical :: module_is_initialized = .false. !< Record whether this module has been initialized.
-  logical :: visc_rem_dt_fix = .false. !<If true, use dt rather than dt_pred for vertvisc_rem at the end of predictor.
+  logical :: visc_rem_dt_bug = .true. !< If true, recover a bug that uses dt_pred rather than dt for vertvisc_rem
+                                      !! at the end of predictor.
 
   !>@{ Diagnostic IDs
   !  integer :: id_uold   = -1, id_vold   = -1
@@ -754,10 +755,10 @@ subroutine step_MOM_dyn_split_RK2b(u_av, v_av, h, tv, visc, Time_local, dt, forc
     call start_group_pass(CS%pass_uvp, G%Domain, clock=id_clock_pass)
     call cpu_clock_begin(id_clock_vertvisc)
   endif
-  if (CS%visc_rem_dt_fix) then
-    call vertvisc_remnant(visc, CS%visc_rem_u, CS%visc_rem_v, dt, G, GV, US, CS%vertvisc_CSp)
-  else
+  if (CS%visc_rem_dt_bug) then
     call vertvisc_remnant(visc, CS%visc_rem_u, CS%visc_rem_v, dt_pred, G, GV, US, CS%vertvisc_CSp)
+  else
+    call vertvisc_remnant(visc, CS%visc_rem_u, CS%visc_rem_v, dt, G, GV, US, CS%vertvisc_CSp)
   endif
   call cpu_clock_end(id_clock_vertvisc)
 
@@ -1355,16 +1356,15 @@ subroutine initialize_dyn_split_RK2b(u, v, h, tv, uh, vh, eta, Time, G, GV, US,
                  default=.false.)
   call get_param(param_file, mdl, "VISC_REM_BUG", visc_rem_bug, &
                  "If true, visc_rem_[uv] in split mode is incorrectly calculated or accounted "//&
-                 "for in three places. This parameter controls the defaults of three individual "//&
-                 "flags, VISC_REM_TIMESTEP_FIX in MOM_dynamics_split_RK2(b), "//&
-                 "VISC_REM_BT_WEIGHT_FIX in MOM_barotropic, and VISC_REM_CONT_HVEL_FIX in "//&
-                 "MOM_continuity_PPM. Eventually, the three individual flags should be removed "//&
-                 "after tests and the default of VISC_REM_BUG should be to False.", default=.true.)
-  call get_param(param_file, mdl, "VISC_REM_TIMESTEP_FIX", CS%visc_rem_dt_fix, &
-                 "If true, use dt rather than dt_pred in vertvisc_remnant() at the end of "//&
-                 "predictor stage for the following continuity() call and btstep() call "//&
-                 "in the corrector step. Default of this flag is set by VISC_REM_BUG. "//&
-                 "This flag should be used with VISC_REM_BT_WEIGHT_FIX.", default=.not.visc_rem_bug)
+                 "for in two places. This parameter controls the defaults of two individual "//&
+                 "flags, VISC_REM_TIMESTEP_BUG in MOM_dynamics_split_RK2(b) and "//&
+                 "VISC_REM_BT_WEIGHT_BUG in MOM_barotropic.", default=.true.)
+  call get_param(param_file, mdl, "VISC_REM_TIMESTEP_BUG", CS%visc_rem_dt_bug, &
+                 "If true, recover a bug that uses dt_pred rather than dt in "//&
+                 "vertvisc_remnant() at the end of predictor stage for the following "//&
+                 "continuity() and btstep() calls in the corrector step. Default of this flag "//&
+                 "is set by VISC_REM_BUG", default=visc_rem_bug)
+
 
   allocate(CS%taux_bot(IsdB:IedB,jsd:jed), source=0.0)
   allocate(CS%tauy_bot(isd:ied,JsdB:JedB), source=0.0)