This commit does not change any functionality. It just prepares for
easier implementation of the compression of the restart snapshots.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The default compression levels correspond now to the default levels
defined by each compression format library.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This commit implements two data filters:
1) "shuffle" - reorganizes bytes to group most to less significant parts
together: |a1|a2|a3|b1|b2|b3| -> |a1|b1|c1|a2|b2|c2|a3|b3|c3|
2) "bytedelta" - additionally stores differences between subsequent
values: |a1|a2|a3|b1|b2|b3| -> |a1|b1-a1|c1-b1|a2|b2-a2|c2-b2|a3|b3-a3|c3-b3|
For large datasets, in particular in 3D, the compression ratio can be
significantly better after applying these filters.
Inspired by https://aras-p.info/blog/2023/03/01/Float-Compression-7-More-Filtering-Optimization/
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This setup assume two flux tubes formed by eliptic magnetic field lines.
The two flux tubes enter in contact in the midplane. Moreover, the
magnetic field lines change the polarization across the contact plane.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
For of all, update_shape now works with the conservative variables.
It is called in three points:
1) Just after the integration update or when the block were (de)refined.
2) Afted the boundary update.
3) If the unphysical cell correction is on, it is applied to blocks
which contain unphysical cells after they are corrected.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This makes the multiple block refinement extremenly slow, especially
when job is restarted with the maximum refinement level increased.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
In the case of embedded integration method, the time step resulting from
the error could drop to very small values. In such situation, the next
time step is taken to a maximum value between the time step due to error
and the stability time step multiplied by the safe factor. By default
this factor is set to 0.01.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The meaning of these variables was inverted. Therefore, the limiting of
positive variables was not working.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The period is controlled by two parameters:
'injection_time_start' - the beginning of the injection period,
'injection_time_stop' - the end of the injection period.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The coefficient correspond to the maximum of the imaginary part of the
modified wave number to be 2e-6 and the integrated error to be 1.54e-11.
The subroutine was renamed to to OCMP9P, as pentadiagonal.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The coefficient correspond to the maximum of the imaginary part of the
modified wave number to be 2e-6 and the integrated error to be 1.38e-11.
The subroutine was renamed to to OCMP7P, as pentadiagonal.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The coefficient correspond to the maximum of the imaginary part of the
modified wave number to be 2e-6 and the integrated error to be 6.4e-12.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
There two variants selected using parameter 'ocmp_scheme_mode':
1) 'stable' - which guarantees the scheme numerical instability by
enforcing the stable dissipation errors
2) 'minimum' - which enforced the dissipation errors to be smaller than
2e-5
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
Restore the original Suresh & Huynh limiter and add modification by
Ahn & Lee for compact schemes. Additionally, pass the variable
positivity flag and for positive variables modifie the lower limit
using the minimum value obtained from the cubic spline interpolation.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This is an improvement in the case a job restarted with a higher
number of processes. The reading of data blocks is spread among new
processes, so it better balances memory.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
The thikness of the current sheet is set to the square root of the
resistivity, if it is not set explictely in the parameter file.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
This is the Alfvén speed along the X direction defining the velocity
scale, time scale, and the Lundquist number.
Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>
