Update terminal output and add limiting factor to adaptive output

[wilfonba]

This PR improves the runtime terminal output for simulations. The terminal output width is reduced. The following shows a before and after for a constant delta t simulation

Before:
 [  0%]  Time step        1 of 1001 @ t_step =        0 Time Avg = 0.000000E+00 Time/step= 0.000000E+00 ETA (HH:MM:SS) = 0:00:00
 [  1%]  Time step        2 of 1001 @ t_step =        1 Time Avg = 0.000000E+00 Time/step= 3.007400E-02 ETA (HH:MM:SS) = 0:00:00
 [  1%]  Time step        3 of 1001 @ t_step =        2 Time Avg = 0.000000E+00 Time/step= 2.920300E-02 ETA (HH:MM:SS) = 0:00:00
 [  1%]  Time step        4 of 1001 @ t_step =        3 Time Avg = 2.900600E-02 Time/step= 2.900600E-02 ETA (HH:MM:SS) = 0:00:28
 [  1%]  Time step        5 of 1001 @ t_step =        4 Time Avg = 2.869950E-02 Time/step= 2.839300E-02 ETA (HH:MM:SS) = 0:00:28
 [  1%]  Time step        6 of 1001 @ t_step =        5 Time Avg = 2.865167E-02 Time/step= 2.855600E-02 ETA (HH:MM:SS) = 0:00:28

After:
 [  0%] step 1 of 1001 (t_step 0) t/step  0.00E+00s (avg  0.00E+00s) ETA 0:00:00
 [  1%] step 2 of 1001 (t_step 1) t/step  2.88E-02s (avg  0.00E+00s) ETA 0:00:00
 [  1%] step 3 of 1001 (t_step 2) t/step  2.83E-02s (avg  0.00E+00s) ETA 0:00:00
 [  1%] step 4 of 1001 (t_step 3) t/step  2.75E-02s (avg  2.75E-02s) ETA 0:00:27
 [  1%] step 5 of 1001 (t_step 4) t/step  2.76E-02s (avg  2.76E-02s) ETA 0:00:27
 [  1%] step 6 of 1001 (t_step 5) t/step  2.80E-02s (avg  2.77E-02s) ETA 0:00:27

The output for a cfl_const_dt is identical since the delta t is constant. The following shows the before and after for a cfl_adap_dt simulation

Before:
 [  0%] Time     0.000000E+00 dt =     1.940738E-06 @ Time Step =        0 Time Avg =     0.000000E+00 Time/step = 0.000000E+00 ETA (HH:MM:SS) = 0:00:00
 [  1%] Time     1.940738E-06 dt =     1.940196E-06 @ Time Step =        1 Time Avg =     6.183838E-04 Time/step = 6.122000E-02 ETA (HH:MM:SS) = 0:00:02
 [  1%] Time     3.880934E-06 dt =     1.940727E-06 @ Time Step =        2 Time Avg =     1.212500E-03 Time/step = 6.003000E-02 ETA (HH:MM:SS) = 0:00:04
 [  1%] Time     5.821661E-06 dt =     1.940699E-06 @ Time Step =        3 Time Avg =     1.784436E-03 Time/step = 5.897800E-02 ETA (HH:MM:SS) = 0:00:07
 [  1%] Time     7.762360E-06 dt =     1.940079E-06 @ Time Step =        4 Time Avg =     2.336284E-03 Time/step = 5.807300E-02 ETA (HH:MM:SS) = 0:00:09
 [  1%] Time     9.702439E-06 dt =     1.939277E-06 @ Time Step =        5 Time Avg =     2.875777E-03 Time/step = 5.790400E-02 ETA (HH:MM:SS) = 0:00:11
 [  1%] Time     1.164172E-05 dt =     1.939666E-06 @ Time Step =        6 Time Avg =     3.401279E-03 Time/step = 5.752800E-02 ETA (HH:MM:SS) = 0:00:14
After:
 [  0%] t =  0.0000E+00 dt =  1.9407E-06 (ICFL) @ step 0 t/step  0.00E+00s (avg  0.00E+00s) ETA 0:00:00
 [  1%] t =  1.9407E-06 dt =  1.9402E-06 (ICFL) @ step 1 t/step  6.09E-02s (avg  6.15E-04s) ETA 0:00:02
 [  1%] t =  3.8809E-06 dt =  1.9407E-06 (ICFL) @ step 2 t/step  5.87E-02s (avg  1.20E-03s) ETA 0:00:04
 [  1%] t =  5.8217E-06 dt =  1.9407E-06 (ICFL) @ step 3 t/step  5.83E-02s (avg  1.76E-03s) ETA 0:00:07
 [  1%] t =  7.7624E-06 dt =  1.9401E-06 (ICFL) @ step 4 t/step  5.71E-02s (avg  2.30E-03s) ETA 0:00:09
 [  1%] t =  9.7024E-06 dt =  1.9393E-06 (ICFL) @ step 5 t/step  5.73E-02s (avg  2.84E-03s) ETA 0:00:11

Contribution Policy

We do not accept pull requests generated primarily by AI without genuine understanding or real-world usage context.

All contributions are expected to demonstrate:

• A clear understanding of the codebase
• Alignment with product direction
• Thoughtful reasoning behind changes
• Evidence of real-world usage or hands-on experience with the problem

If these expectations are not met, we would prefer to implement the changes ourselves rather than spend time reviewing low-effort submissions.

---

Acknowledgement

• I confirm this PR meets the above expectations and reflects my own understanding and real-world context.

---

PR template credit: junegunn

[sbryngelson]

the kind of notation that could get expensive on amd compilers. did you do any testing

[wilfonba]

I did not... I'll make this a constant size array rather than a constructed array in the subroutine call

[Copilot]

Pull request overview

Warning

Copilot couldn't run its full agentic review because it didn't start before the timeout. Make sure your repository has a runner available, or add a copilot-code-review.yml file specifying one with the runs-on attribute. See the docs for more details.

This PR refines simulation runtime terminal output formatting and adds visibility into which CFL criterion (inviscid/viscous/capillary) is limiting the adaptive time step.

Changes:

• Track per-criterion CFL candidate time steps and select the global limiting criterion.
• Add an MPI helper to allreduce elementwise minima for small real vectors.
• Update printed progress lines to be shorter and (for adaptive CFL) include the limiting criterion tag.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/simulation/m_time_steppers.fpp	Computes per-criterion dt candidates, reduces globally, and records which criterion limits dt.
src/simulation/m_start_up.fpp	Updates progress/ETA print formatting and appends limiter tag for adaptive dt runs.
src/simulation/m_sim_helpers.fpp	Exposes dt_limiter state and expands CFL helper to return 3 candidate dts.
src/common/m_mpi_common.fpp	Adds s_mpi_allreduce_min_vec for elementwise global minima of real vectors.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[github-actions]

Lines of Code

File	Lines	Diff
src/common/m_mpi_common.fpp	1484	+10
src/simulation/m_time_steppers.fpp	835	+7
src/simulation/m_sim_helpers.fpp	200	+4
src/simulation/m_start_up.fpp	1248	+4

Directory	Lines	Diff
common	9783	+10
simulation	27924	+15
total	45540	+25