/******************************************************************************* * This file is part of SWIFT. * Copyright (c) 2016 Matthieu Schaller (schaller@strw.leidenuniv.nl) * * 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 <http://www.gnu.org/licenses/>. * ******************************************************************************/ #ifndef SWIFT_PRESSURE_ENTROPY_HYDRO_PART_H #define SWIFT_PRESSURE_ENTROPY_HYDRO_PART_H /** * @file PressureEntropy/hydro_part.h * @brief Pressure-Entropy implementation of SPH (Particle definition) * * The thermal variable is the entropy (S) and the entropy is smoothed over * contact discontinuities to prevent spurious surface tension. * * Follows eqautions (19), (21) and (22) of Hopkins, P., MNRAS, 2013, * Volume 428, Issue 4, pp. 2840-2856 with a simple Balsara viscosity term. */ #include "adaptive_softening_struct.h" #include "black_holes_struct.h" #include "chemistry_struct.h" #include "cooling_struct.h" #include "feedback_struct.h" #include "mhd_struct.h" #include "particle_splitting_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; } 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 weighted density */ float rho_bar; /*! Particle entropy. */ float entropy; /*! Entropy time derivative */ float entropy_dt; /*! Particle entropy to the power 1/gamma. */ float entropy_one_over_gamma; union { struct { /*! Number of neighbours. */ float wcount; /*! Number of neighbours spatial derivative. */ float wcount_dh; /*! Derivative of density with respect to h */ float rho_dh; /*! Derivative of pressure with respect to h */ float pressure_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 term */ 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 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 } SWIFT_STRUCT_ALIGN; #endif /* SWIFT_PRESSURE_ENTROPY_HYDRO_PART_H */