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	tgrain.h - granular - granular dynamics simulation
	git clone git://src.adamsgaard.dk/granular
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	---
	tgrain.h (1776B)
	---
	1 #ifndef GRANULAR_GRAIN_
	2 #define GRANULAR_GRAIN_
	3
	4 #include <stdio.h>
	5 #include "contact.h"
	6
	7 #define MAXCONTACTS 32
	8
	9 struct grain {
	10
	11 double diameter;
	12 double pos[3];
	13 double vel[3];
	14 double acc[3];
	15 int acc_lock[3];
	16 double force[3];
	17 double angpos[3];
	18 double angvel[3];
	19 double angacc[3];
	20 double torque[3];
	21 double disp[3];
	22 double forceext[3];
	23 double density;
	24 int fixed;
	25 int rotating;
	26 int enabled;
	27 double youngs_modulus;
	28 double poissons_ratio;
	29 double friction_coeff;
	30 double damping_n;
	31 double damping_t;
	32 double tensile_strength;
	33 double shear_strength;
	34 double fracture_toughness;
	35 size_t gridpos[3];
	36 size_t ncontacts;
	37 struct contact contacts[MAXCONTACTS];
	38 double contact_stress[3];
	39 double thermal_energy;
	40 int color;
	41 };
	42
	43 struct grain grain_new(void);
	44 void grain_defaults(struct grain *g);
	45
	46 void grain_print(FILE stream, const struct grain g);
	47 struct grain * grain_read(char *line);
	48
	49 int grain_check_values(const struct grain *g);
	50
	51 double grain_volume(const struct grain *g);
	52 double grain_mass(const struct grain *g);
	53 double grain_moment_of_inertia(const struct grain *g);
	54 void grain_zero_kinematics(struct grain *g);
	55 void grain_force_reset(struct grain *g);
	56 double grain_translational_kinetic_energy(const struct grain *g);
	57 double grain_rotational_kinetic_energy(const struct grain *g);
	58 double grain_kinetic_energy(const struct grain *g);
	59 double grain_thermal_energy(const struct grain *g);
	60 void grain_temporal_integration(struct grain *g, double dt);
	61
	62 void grain_register_contact(struct grain *g, size_t i, size_t j,
	63 double centerdist[3], double overlap);
	64
	65 double grain_stiffness_normal(const struct grain *g);
	66 double grain_stiffness_tangential(const struct grain *g);
	67 double grain_collision_time(const struct grain *g);
	68
	69 #endif