/******************************************************************************* * 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 . * ******************************************************************************/ #ifndef SWIFT_MINIMAL_HYDRO_PART_H #define SWIFT_MINIMAL_HYDRO_PART_H /** * @file Minimal/hydro_part.h * @brief Minimal conservative implementation of SPH (Particle definition) * * The thermal variable is the internal energy (u). Simple constant * viscosity term with the Balsara (1995) switch. No thermal conduction * term is implemented. * * This corresponds to equations (43), (44), (45), (101), (103) and (104) with * \f$\beta=3\f$ and \f$\alpha_u=0\f$ of Price, D., Journal of Computational * Physics, 2012, Volume 231, Issue 3, pp. 759-794. */ #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" /** * @brief Particle fields not needed during the SPH loops over neighbours. * * This structure contains the particle fields that are not used in the * density or force loops. Quantities should be used in the kick, drift and * potentially ghost tasks only. */ 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]; /*! Internal energy at the last full step. */ float u_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 tracers */ 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; /** * @brief Particle fields for the SPH particles * * The density and force substructures are used to contain variables only used * within the density and force loops over neighbours. All more permanent * variables should be declared in the main part of the part structure, */ struct part { /*! Particle unique 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 mass. */ float mass; /*! Particle smoothing length. */ float h; /*! Particle internal energy. */ float u; /*! Time derivative of the internal energy. */ float u_dt; /*! Particle density. */ float rho; /* Store density/force specific stuff. */ union { /** * @brief Structure for the variables only used in the density loop over * neighbours. * * Quantities in this sub-structure should only be accessed in the density * loop over neighbours and the ghost task. */ struct { /*! Neighbour number count. */ float wcount; /*! Derivative of the neighbour number with respect to h. */ float wcount_dh; /*! Derivative of density with respect to h */ float rho_dh; /*! Velocity divergence */ float div_v; /*! Velocity curl */ float rot_v[3]; } density; /** * @brief Structure for the variables only used in the force loop over * neighbours. * * Quantities in this sub-structure should only be accessed in the force * loop over neighbours and the ghost, drift and kick tasks. */ struct { /*! "Grad h" term */ float f; /*! Particle pressure. */ float pressure; /*! Particle soundspeed. */ float soundspeed; /*! Particle signal velocity */ float v_sig; /*! Time derivative of smoothing length */ float h_dt; /*! Balsara switch */ float balsara; } 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_MINIMAL_HYDRO_PART_H */