/******************************************************************************* * This file is part of SWIFT. * Copyright (c) 2012 Pedro Gonnet (pedro.gonnet@durham.ac.uk) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see . * ******************************************************************************/ #ifndef SWIFT_GADGET2_HYDRO_PART_H #define SWIFT_GADGET2_HYDRO_PART_H /** * @file Gadget2/hydro_part.h * @brief SPH interaction functions following the Gadget-2 version of SPH. * * The interactions computed here are the ones presented in the Gadget-2 paper * Springel, V., MNRAS, Volume 364, Issue 4, pp. 1105-1134. * We use the same numerical coefficients as the Gadget-2 code. When used with * the Spline-3 kernel, the results should be equivalent to the ones obtained * with Gadget-2 up to the rounding errors and interactions missed by the * Gadget-2 tree-code neighbours search. */ #include "adaptive_softening_struct.h" #include "black_holes_struct.h" #include "chemistry_struct.h" #include "cooling_struct.h" #include "csds.h" #include "feedback_struct.h" #include "mhd_struct.h" #include "particle_splitting_struct.h" #include "pressure_floor_struct.h" #include "rt_struct.h" #include "sink_struct.h" #include "star_formation_struct.h" #include "timestep_limiter_struct.h" #include "tracers_struct.h" /* Extra particle data not needed during the SPH loops over neighbours. */ struct xpart { /* Offset between current position and position at last tree rebuild. */ float x_diff[3]; /* Offset between the current position and position at the last sort. */ float x_diff_sort[3]; /* Velocity at the last full step. */ float v_full[3]; /*! Gravitational acceleration at the end of the last step */ float a_grav[3]; /* Entropy at the last full step. */ float entropy_full; /*! Additional data used to record particle splits */ struct particle_splitting_data split_data; /* Additional data used to record cooling information */ struct cooling_xpart_data cooling_data; /* Additional data used by the tracers */ struct tracers_xpart_data tracers_data; /* Additional data used by the star formation */ struct star_formation_xpart_data sf_data; /* Additional data used by the feedback */ struct feedback_xpart_data feedback_data; /*! Additional data used by the MHD scheme */ struct mhd_xpart_data mhd_data; #ifdef WITH_CSDS /* Additional data for the particle csds */ struct csds_part_data csds_data; #endif } SWIFT_STRUCT_ALIGN; /* Data of a single particle. */ struct part { /* Particle ID. */ long long id; /* Pointer to corresponding gravity part. */ struct gpart* gpart; /* Particle position. */ double x[3]; /* Particle predicted velocity. */ float v[3]; /* Particle acceleration. */ float a_hydro[3]; /* Particle cutoff radius. */ float h; /* Particle mass. */ float mass; /* Particle density. */ float rho; /* Particle entropy. */ float entropy; /* Entropy time derivative */ float entropy_dt; union { struct { /* Number of neighbours. */ float wcount; /* Number of neighbours spatial derivative. */ float wcount_dh; /* Derivative of the density with respect to h. */ float rho_dh; /* Particle velocity curl. */ float rot_v[3]; /* Particle velocity divergence. */ float div_v; } density; struct { /* Balsara switch */ float balsara; /*! "Grad h" term */ float f; /* Pressure over density squared */ float P_over_rho2; /* Particle sound speed. */ float soundspeed; /* Signal velocity. */ float v_sig; /* Time derivative of the smoothing length */ float h_dt; } force; }; /*! Additional data used for adaptive softening */ struct adaptive_softening_part_data adaptive_softening_data; /*! Additional data used by the MHD scheme */ struct mhd_part_data mhd_data; /*! Chemistry information */ struct chemistry_part_data chemistry_data; /*! Cooling information */ struct cooling_part_data cooling_data; /*! Additional data used by the feedback */ struct feedback_part_data feedback_data; /*! Black holes information (e.g. swallowing ID) */ struct black_holes_part_data black_holes_data; /*! Sink information (e.g. swallowing ID) */ struct sink_part_data sink_data; /*! Additional data used by the pressure floor */ struct pressure_floor_part_data pressure_floor_data; /*! Additional Radiative Transfer Data */ struct rt_part_data rt_data; /*! RT sub-cycling time stepping data */ struct rt_timestepping_data rt_time_data; /*! Time-step length */ timebin_t time_bin; /*! Tree-depth at which size / 2 <= h * gamma < size */ char depth_h; /*! Time-step limiter information */ struct timestep_limiter_data limiter_data; #ifdef SWIFT_DEBUG_CHECKS /* Time of the last drift */ integertime_t ti_drift; /* Time of the last kick */ integertime_t ti_kick; #endif #ifdef DEBUG_INTERACTIONS_SPH /*! List of interacting particles in the density SELF and PAIR */ long long ids_ngbs_density[MAX_NUM_OF_NEIGHBOURS]; /*! List of interacting particles in the force SELF and PAIR */ long long ids_ngbs_force[MAX_NUM_OF_NEIGHBOURS]; /*! Number of interactions in the density SELF and PAIR */ int num_ngb_density; /*! Number of interactions in the force SELF and PAIR */ int num_ngb_force; #endif } SWIFT_STRUCT_ALIGN; #endif /* SWIFT_GADGET2_HYDRO_PART_H */