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Add an option to control Amr regrid interval when max_level==0 #4752

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Add an option to control Amr regrid interval when max_level==0 #4752

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ce59f3f
Amr: Allow Regrid control using regrid_level0_int when max_level==0
cityadmirer Nov 3, 2025
0fbf16c
regrid on max_level==0 should set level_count to use regrid_level0_int
cityadmirer Nov 4, 2025
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1 change: 1 addition & 0 deletions Src/Amr/AMReX_Amr.H
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Original file line number Diff line number Diff line change
Expand Up @@ -456,6 +456,7 @@ protected:
LevelBld* levelbld;
bool abort_on_stream_retry_failure;
int stream_max_tries;
int regrid_level0_int;
int loadbalance_with_workestimates;
int loadbalance_level0_int;
Real loadbalance_max_fac;
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19 changes: 14 additions & 5 deletions Src/Amr/AMReX_Amr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -501,6 +501,9 @@ Amr::InitAmr ()
#undef STRIP
}

regrid_level0_int = -1;
pp.query("regrid_level0_int", regrid_level0_int);

loadbalance_with_workestimates = 0;
pp.query("loadbalance_with_workestimates", loadbalance_with_workestimates);

Expand Down Expand Up @@ -1935,16 +1938,13 @@ Amr::timeStep (int level,
// Update so that by default, we don't force a post-step regrid.
amr_level[level]->setPostStepRegrid(0);

if(max_level==0 && force_regrid_level_zero){
regrid_level_0_on_restart();
}

//
// Allow regridding of level 0 calculation on restart.
//
if (max_level == 0 && regrid_on_restart)
if (max_level == 0 && (regrid_on_restart || force_regrid_level_zero))
{
regrid_level_0_on_restart();
level_count[0] = 0;
}
else
{
Expand Down Expand Up @@ -1994,6 +1994,15 @@ Amr::timeStep (int level,
}
}

if (max_level == 0 && regrid_level0_int > 0)
{
if (level_count[0] >= regrid_level0_int)
{
regrid_level_0_on_restart();
level_count[0] = 0;
}
}

if (max_level == 0 && loadbalance_level0_int > 0 && loadbalance_with_workestimates)
{
if (level_steps[0] == 1 || level_count[0] >= loadbalance_level0_int) {
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