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(optionally) add T/e correction term to Strang Jacobians #1595

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@zingale zingale commented Jun 26, 2024

this is the dT/dX |_e term that appears in all species
it is now controlled by integrator.correct_jacobian_for_const_e

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zingale commented Jun 26, 2024

closes #729

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zingale commented Jun 27, 2024

some Strang data using burn_cell. Build as:

make NETWORK_DIR=subch_simple

then run the old way:

./main3d.gnu.ex inputs_subch_simple integrator.jacobian=1 unit_test.nsteps=1 integrator.correct_jacobian_for_const_e=0

and it take 8084 steps.

Running with the new correction, integrator.correct_jacobian_for_const_e=1 and it takes

6788 steps

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zingale commented Jun 27, 2024

curiously, with aprox21, it goes the other way, and we are slower

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zingale commented Jun 27, 2024

for He-C-Fe-group, using the correction terms speeds things up by 4x

./main3d.gnu.ex inputs_subch_simple integrator.jacobian=1 unit_test.nsteps=1 integrator.correct_jacobian_for_const_e=1 unit_test.tmax=1.e-2

104499 without the corrections
24735 with the corrections

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zingale commented Jun 27, 2024

Here's some test_react runs:

  • aprox13

    with new terms:

    Run time = 2.016436636
    min number of rhs calls: 6
    avg number of rhs calls: 96
    max number of rhs calls: 1171
    min number of steps: 3
    avg number of steps: 75
    max number of steps: 878
    

    without new terms:

    Run time = 2.397303023
    min number of rhs calls: 6
    avg number of rhs calls: 116
    max number of rhs calls: 3932
    min number of steps: 3
    avg number of steps: 94
    max number of steps: 3767
    
  • subch_simple (using inputs_aprox13):

    with new terms:

    Run time = 101.0353978
    min number of rhs calls: 6
    avg number of rhs calls: 3962
    max number of rhs calls: 147079
    min number of steps: 3
    avg number of steps: 2219
    max number of steps: 79369
    

    without new terms:

    Run time = 100.0271792
    min number of rhs calls: 6
    avg number of rhs calls: 3975
    max number of rhs calls: 157375
    min number of steps: 3
    avg number of steps: 2284
    max number of steps: 86380
    

@zingale zingale changed the title [WIP] add a runtime parameter to disable the T/e correction term in Jacobians add a runtime parameter to disable the T/e correction term in Jacobians Jun 28, 2024
@zingale zingale changed the title add a runtime parameter to disable the T/e correction term in Jacobians (optionally) add T/e correction term to Strang Jacobians Jun 28, 2024
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zingale commented Jul 12, 2024

here's a Castro run with these changes:
http://groot.astro.sunysb.edu/Castro/test-suite/gfortran/2024-07-12-002/index.html

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