const.h 4.75 KB
Newer Older
1
/*******************************************************************************
2
 * This file is part of SWIFT.
3
 * Copyright (c) 2012 Pedro Gonnet (ptcedro.gonnet@durham.ac.uk)
4
 *                    Matthieu Schaller (matthieu.schaller@durham.ac.uk)
5
 *
6
7
8
9
 * 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.
10
 *
11
12
13
14
 * 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.
15
 *
16
17
 * 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/>.
18
 *
19
 ******************************************************************************/
20
21
#ifndef SWIFT_CONST_H
#define SWIFT_CONST_H
22

23
/* SPH Viscosity constants. */
24
#define const_viscosity_alpha 0.8f
25
26
27
28
29
30
#define const_viscosity_alpha_min \
  0.1f /* Values taken from (Price,2004), not used in legacy gadget mode */
#define const_viscosity_alpha_max \
  2.0f /* Values taken from (Price,2004), not used in legacy gadget mode */
#define const_viscosity_length \
  0.1f /* Values taken from (Price,2004), not used in legacy gadget mode */
31
32

/* SPH Thermal conductivity constants. */
33
34
#define const_conductivity_alpha \
  1.f /* Value taken from (Price,2008), not used in legacy gadget mode */
35
36

/* Time integration constants. */
37
#define const_max_u_change 0.1f
38

Tom Theuns's avatar
Tom Theuns committed
39
40
41
42
43
44
45
46
47
/* Type of gradients to use (GIZMO_SPH only) */
/* If no option is chosen, no gradients are used (first order scheme) */
//#define GRADIENTS_SPH
#define GRADIENTS_GIZMO

/* Types of slope limiter to use (GIZMO_SPH only) */
/* Different slope limiters can be combined */
#define SLOPE_LIMITER_PER_FACE
#define SLOPE_LIMITER_CELL_WIDE
48

49
50
51
/* Types of flux limiter to use (GIZMO_SPH only) */
#define GIZMO_FLUX_LIMITER

52
53
/* Options to control the movement of particles for GIZMO_SPH. */
/* This option disables particle movement */
54
//#define GIZMO_FIX_PARTICLES
55
56
/* Try to keep cells regular by adding a correction velocity. */
#define GIZMO_STEER_MOTION
57
//#define GIZMO_TOTAL_ENERGY
58

59
60
61
62
63
64
65
66
67
68
69
70
/* Options to control handling of unphysical values (GIZMO_SPH only). */
/* In GIZMO, mass and energy (and hence density and pressure) can in principle
   become negative, which will cause unwanted behaviour that can make the code
   crash.
   If no options are selected below, we assume (and pray) that this will not
   happen, and add no restrictions to how these variables are treated. */
/* Check for unphysical values and crash if they occur. */
//#define GIZMO_UNPHYSICAL_ERROR
/* Check for unphysical values and reset them to safe values. */
#define GIZMO_UNPHYSICAL_RESCUE
/* Show a warning message if an unphysical value was reset (only works if
   GIZMO_UNPHYSICAL_RESCUE is also selected). */
71
#define GIZMO_UNPHYSICAL_WARNING
72
73
74
75

/* Parameters that control how GIZMO handles pathological particle
   configurations. */
/* Show a warning message if a pathological configuration has been detected. */
76
//#define GIZMO_PATHOLOGICAL_WARNING
77
/* Crash if a pathological configuration has been detected. */
78
//#define GIZMO_PATHOLOGICAL_ERROR
79
80
81
82
83
84
85
86
87
88
89
90
91
/* Maximum allowed gradient matrix condition number. If the condition number of
   the gradient matrix (defined in equation C1 in Hopkins, 2015) is larger than
   this value, we artificially increase the number of neighbours to get a more
   homogeneous sampling. */
#define const_gizmo_max_condition_number 100.0f
/* Correction factor applied to the particle wcount to force more neighbours if
   the condition number is too large. */
#define const_gizmo_w_correction_factor 0.9f
/* Lower limit on the wcount correction factor. If the condition number is still
   too high after this wcount correction has been applied, we give up on the
   gradient matrix and use SPH gradients instead. */
#define const_gizmo_min_wcorr 0.5f

92
93
94
95
96
97
98
99
/* Types of gradients to use for SHADOWFAX_SPH */
/* If no option is chosen, no gradients are used (first order scheme) */
#define SHADOWFAX_GRADIENTS

/* SHADOWFAX_SPH slope limiters */
#define SHADOWFAX_SLOPE_LIMITER_PER_FACE
#define SHADOWFAX_SLOPE_LIMITER_CELL_WIDE

100
101
/* Options to control SHADOWFAX_SPH */
/* This option disables cell movement */
102
103
104
105
//#define SHADOWFAX_FIX_CELLS
/* This option enables cell steering, i.e. trying to keep the cells regular by
   adding a correction to the cell velocities.*/
#define SHADOWFAX_STEER_CELL_MOTION
106
107
/* This option evolves the total energy instead of the thermal energy */
//#define SHADOWFAX_TOTAL_ENERGY
108

Tom Theuns's avatar
Tom Theuns committed
109
/* Source terms */
Tom Theuns's avatar
Tom Theuns committed
110
111
#define SOURCETERMS_NONE
//#define SOURCETERMS_SN_FEEDBACK
Tom Theuns's avatar
Tom Theuns committed
112

113
#endif /* SWIFT_CONST_H */