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The current 2D RBC implementation uses the canonical domain with z=(-1,1). This updates that to arbitrary coordinates with the default matching the standard z=(0, 1).
Also, IO was based on the loads-of-pickle-files approach that I used before Thibaut developed FieldsIO. This PR switches to FieldsIO, which is much better.
Finally, there was a coefficient of the thermal diffusivity missing in the Nusselt number computation, which I added here.

The majority of this PR adapts stuff from the GPU project to these changes. It was broken before due to a weird mix of pickle files and FieldsIO. For reproducing of plots in my thesis, it was necessary to use the corresponding release even before this PR, so I wouldn't worry about this.

@pancetta pancetta merged commit 5e67e05 into Parallel-in-Time:master Aug 26, 2025
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brownbaerchen added a commit to brownbaerchen/pySDC that referenced this pull request Nov 4, 2025
#!!!!!!!!!! WARNING: RUFF FAILED !!!!!!!!!!: 

#pySDC/projects/GPU/analysis_scripts/compare_RBC3D.py:298:5: F841 Local variable `data` is assigned to but never used
#    |
Parallel-in-Time#296 |     res = 32
Parallel-in-Time#297 |
Parallel-in-Time#298 |     data = []
#    |     ^^^^ F841
Parallel-in-Time#299 |     labels = []
Parallel-in-Time#300 |     linestyles = []
#    |
#    = help: Remove assignment to unused variable `data`
#
#pySDC/projects/GPU/analysis_scripts/compare_RBC3D.py:299:5: F841 Local variable `labels` is assigned to but never used
#    |
Parallel-in-Time#298 |     data = []
Parallel-in-Time#299 |     labels = []
#    |     ^^^^^^ F841
Parallel-in-Time#300 |     linestyles = []
#    |
#    = help: Remove assignment to unused variable `labels`
#
#pySDC/projects/GPU/analysis_scripts/compare_RBC3D.py:300:5: F841 Local variable `linestyles` is assigned to but never used
#    |
Parallel-in-Time#298 |     data = []
Parallel-in-Time#299 |     labels = []
Parallel-in-Time#300 |     linestyles = []
#    |     ^^^^^^^^^^ F841
Parallel-in-Time#301 |
Parallel-in-Time#302 |     ref_data = get_pySDC_data(Ra, res=res, dt=0.01, config_name='RBC3DG4R4')
#    |
#    = help: Remove assignment to unused variable `linestyles`
#
#pySDC/projects/GPU/analysis_scripts/compare_RBC3D.py:312:9: F841 Local variable `t` is assigned to but never used
#    |
Parallel-in-Time#310 |         ax.set_title(title)
Parallel-in-Time#311 |         Nu_ref = np.array(ref['Nu']['V'])
Parallel-in-Time#312 |         t = ref['t']
#    |         ^ F841
Parallel-in-Time#313 |
Parallel-in-Time#314 |         for dt in dts:
#    |
#    = help: Remove assignment to unused variable `t`
#
#pySDC/projects/GPU/analysis_scripts/compare_RBC3D.py:587:9: E722 Do not use bare `except`
#    |
Parallel-in-Time#585 |                 k[_s > 1e-16], _s[_s > 1e-16], color=last_line.get_color(), ls=last_line.get_linestyle(), label=label
Parallel-in-Time#586 |             )
Parallel-in-Time#587 |         except:
#    |         ^^^^^^ E722
Parallel-in-Time#588 |             pass
#    |
#
#pySDC/projects/GPU/analysis_scripts/compare_RBC3D.py:686:5: F841 Local variable `Delta_Nu` is assigned to but never used
#    |
#684 |     t = data['t']
#685 |     avg_Nu = np.array([np.mean(Nu[40 : 40 + i + 1]) for i in range(len(Nu[40:]))])
#686 |     Delta_Nu = np.array([abs(avg_Nu[i + 1] - avg_Nu[i]) for i in range(len(avg_Nu) - 1)])
#    |     ^^^^^^^^ F841
#687 |     # ax.plot(data['t'][40:-1], Delta_Nu / avg_Nu[:-1])
#688 |     # ax.plot(data['t'], np.abs(avg_Nu - avg_Nu[-1]) / avg_Nu[-1])
#    |
#    = help: Remove assignment to unused variable `Delta_Nu`:
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