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USER_PROBLEM: Introduce parameter alpha for thickness scaling.

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Parameter 'alpha' is the index of the scaling of the thickness of the
initial current sheet with the Lundquist number. Its default value of
1/2.

Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This commit is contained in:
Grzegorz Kowal 2023-03-15 16:40:34 -03:00
parent 1cd09d7c27
commit 7c65c0faa4
1 changed files with 43 additions and 31 deletions
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14
sources/user_problem.F90
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@ -31,6 +31,7 @@ module user_problem
implicit none implicit none
real(kind=8), save :: alpha = 5.00d-01
real(kind=8), save :: beta = 1.00d+00 real(kind=8), save :: beta = 1.00d+00
real(kind=8), save :: zeta = 0.00d+00 real(kind=8), save :: zeta = 0.00d+00
real(kind=8), save :: eta = 0.00d+00 real(kind=8), save :: eta = 0.00d+00
@ -191,6 +192,17 @@ module user_problem
return return
end if end if
! get the index for the current sheet thickness scaling
!
call get_parameter("alpha", alpha)
if (alpha <= 0.0d+00) then
if (verbose) &
call print_message(loc, "Current sheet thickness scaling index " // &
"(alpha) must be larger than zero! " // &
"Resetting it to the default value of 1/2.")
alpha = 5.0d-01
end if
! calculate the maximum magnetic pressure, thermal pressure from the plasma-β ! calculate the maximum magnetic pressure, thermal pressure from the plasma-β
! parameters, and the sound speed in the case of isothermal equations of state ! parameters, and the sound speed in the case of isothermal equations of state
! !
@ -201,7 +213,7 @@ module user_problem
csnd = sqrt(csnd2) csnd = sqrt(csnd2)
valf = sqrt(2.0d+00 * pmag / dens) valf = sqrt(2.0d+00 * pmag / dens)
lund = valf / max(tiny(eta), eta) lund = valf / max(tiny(eta), eta)
dlta = lund**(- 1.0d+00 / 3.0d+00) dlta = lund**(-alpha)
! fill up the boundary values ! fill up the boundary values
! !