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EVOLUTION: Treat any unphysical state properly in RK2 method.

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Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This commit is contained in:
Grzegorz Kowal 2021-11-10 09:25:31 -03:00
parent d6b4b70aab
commit 3ffbf1a3c2
1 changed files with 61 additions and 43 deletions
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104
sources/evolution.F90
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@ -1601,7 +1601,7 @@ module evolution
type(block_data), pointer :: pdata
integer :: status
real(kind=8) :: tm, dtm
real(kind=8) :: t, ds
!
!-------------------------------------------------------------------------------
!
@ -1609,76 +1609,94 @@ module evolution
call start_timer(imu)
#endif /* PROFILE */
status = 1
do while(status /= 0)
ds = 5.0d-01 * dt
!= 1st step: U(1) = U(n) + dt * F[U(n)]
!
tm = time + dt
dtm = dt
t = time + dt
pdata => list_data
do while (associated(pdata))
pdata => list_data
do while (associated(pdata))
call update_increment(pdata)
call update_sources(pdata, tm, dtm, pdata%du(:,:,:,:))
call update_increment(pdata)
call update_sources(pdata, t, 0.0d+00, pdata%du(:,:,:,:))
pdata => pdata%next
end do
pdata => pdata%next
end do
call boundary_fluxes()
call boundary_fluxes()
pdata => list_data
do while (associated(pdata))
pdata => list_data
do while (associated(pdata))
pdata%uu(:,:,:,:,2) = pdata%uu(:,:,:,:,1) + dt * pdata%du(:,:,:,:)
pdata%uu(:,:,:,:,2) = pdata%uu(:,:,:,:,1) + dt * pdata%du(:,:,:,:)
pdata%u => pdata%uu(:,:,:,:,2)
pdata%u => pdata%uu(:,:,:,:,2)
pdata => pdata%next
end do
pdata => pdata%next
end do
call update_variables(tm, dtm, status)
call update_variables(t, dt, status)
if (status /= 0) go to 100
!= 2nd step: U(n+1) = 1/2 U(n) + 1/2 U(1) + 1/2 dt * F[U(1)]
!
tm = time + dt
dtm = 0.5d+00 * dt
pdata => list_data
do while (associated(pdata))
pdata => list_data
do while (associated(pdata))
call update_increment(pdata)
call update_sources(pdata, t, ds, pdata%du(:,:,:,:))
call update_increment(pdata)
call update_sources(pdata, tm, dtm, pdata%du(:,:,:,:))
pdata => pdata%next
end do
call boundary_fluxes()
pdata => list_data
do while (associated(pdata))
pdata%uu(:,:,:,:,2) = 5.0d-01 * (pdata%uu(:,:,:,:,1) &
+ pdata%uu(:,:,:,:,2)) &
+ ds * pdata%du(:,:,:,:)
pdata => pdata%next
end do
if (ibp > 0) then
adecay(:) = exp(aglm(:) * cmax * dt)
pdata => list_data
do while (associated(pdata))
pdata%u(ibp,:,:,:) = adecay(pdata%meta%level) * pdata%u(ibp,:,:,:)
pdata => pdata%next
end do
end if
call update_variables(t, ds, status)
100 continue
if (status /= 0) dt = 2.5d-01 * dt
pdata => pdata%next
end do
call boundary_fluxes()
pdata => list_data
do while (associated(pdata))
pdata%uu(:,:,:,:,1) = 0.5d+00 * (pdata%uu(:,:,:,:,1) &
+ pdata%uu(:,:,:,:,2) &
+ dt * pdata%du(:,:,:,:))
pdata%uu(:,:,:,:,1) = pdata%uu(:,:,:,:,2)
pdata%u => pdata%uu(:,:,:,:,1)
pdata => pdata%next
end do
if (ibp > 0) then
adecay(:) = exp(aglm(:) * cmax * dt)
pdata => list_data
do while (associated(pdata))
pdata%u(ibp,:,:,:) = adecay(pdata%meta%level) * pdata%u(ibp,:,:,:)
pdata => pdata%next
end do
end if
call update_variables(tm, dtm, status)
#ifdef PROFILE
call stop_timer(imu)
#endif /* PROFILE */