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allow dt update based on particle CFL for theta implicit solver. #6428

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allow dt update based on particle CFL for theta implicit solver. #6428

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b71cf30
allow dt update based on particle CFL for theta implicit solver.
JustinRayAngus Nov 30, 2025
c9c7c5f
update checksums.
JustinRayAngus Dec 4, 2025
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9 changes: 5 additions & 4 deletions Source/Evolve/WarpXEvolve.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,8 @@ WarpX::Evolve (int numsteps)

// Update timestep for electrostatic solver if a constant dt is not provided
// This first synchronizes the position and velocity before setting the new timestep
if (electromagnetic_solver_id == ElectromagneticSolverAlgo::None &&
if ((electromagnetic_solver_id == ElectromagneticSolverAlgo::None ||
evolve_scheme == EvolveScheme::ThetaImplicitEM) &&
!m_const_dt.has_value() && m_dt_update_interval.contains(step+1)) {
if (verbose_step) {
amrex::Print() << Utils::TextMsg::Info("updating timestep");
Expand Down Expand Up @@ -384,13 +385,13 @@ void WarpX::OneStep (

// implicit solver
if (m_implicit_solver) {
// advance fields and particles by one time step
m_implicit_solver->OneStep(a_cur_time, a_dt, a_step);

// perform particle collisions
ExecutePythonCallback("beforecollisions");
mypc->doCollisions(a_step, a_cur_time, a_dt);
ExecutePythonCallback("aftercollisions");

// advance fields and particles by one time step
m_implicit_solver->OneStep(a_cur_time, a_dt, a_step);
}
// explicit solver
else {
Expand Down
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