Add YASS integrator#1988
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- Add time_start parameter to single_step() for explicit time control - Skip clean_state when using number densities (avoid double normalization) - Replace fine/coarse step error estimation with forward/backward Euler comparison (avoids extra Jacobian/RHS evaluations) - Add VODE-like adaptive timestep controller for accept/reject - Fix step counting (was incrementing by 2 per step) - Add verbose step logging for debugging - Add negative species check for use_number_densities mode - Fix initial_timestep: pass do_clean_state and clamp dt not h - Update inputs_vode_example for BackwardEuler compatibility
Single Newton iteration with Y^0 as initial guess: (I - dt*J^0)(Y^n - Y^0) = dt*F^0 - yass_single_step(): column-scaled LU solve for conservation - be_integrator_yass(): YASS step size control (eps + relative floor) - Runtime parameters: use_yass, yass_eps, yass_floor
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Single Newton iteration with Y^0 as initial guess:
$(I - \Delta t \ J^0)(Y^n - Y^0) = \Delta t \ F^0$
yass_single_step(): column-scaled LU solve for conservationbe_integrator_yass(): YASS step size control (eps + relative floor)use_yass,yass_eps,yass_floorPR Stack 2 of 2: