313 lines
18 KiB
Markdown
313 lines
18 KiB
Markdown
### Parameter values for YouTube simulations ###
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Created by **Nils Berglund** and optimized by **Marco Mancini**
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C code for videos on YouTube Channel https://www.youtube.com/c/NilsBerglund
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Below are parameter values used for different simulations, as well as initial conditions used in
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function animation. Some simulations use variants of the published code. The list is going to be
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updated gradually.
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### 1 August 22 - Convection and mixing of Lennard-Jones particles ###
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**Program:** `lennardjones.c`
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```
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#define MOVIE 1 /* set to 1 to generate movie */
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#define DOUBLE_MOVIE 0 /* set to 1 to produce movies for wave height and energy simultaneously */
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#define TIME_LAPSE 1 /* set to 1 to add a time-lapse movie at the end */
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/* so far incompatible with double movie */
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#define TIME_LAPSE_FACTOR 3 /* factor of time-lapse movie */
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/* General geometrical parameters */
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#define WINWIDTH 1280 /* window width */
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#define WINHEIGHT 720 /* window height */
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#define XMIN -2.0
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#define XMAX 2.0 /* x interval */
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#define YMIN -1.125
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#define YMAX 1.125 /* y interval for 9/16 aspect ratio */
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#define INITXMIN -1.9
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#define INITXMAX 1.9 /* x interval for initial condition */
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#define INITYMIN -1.0
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#define INITYMAX 0.95 /* y interval for initial condition */
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#define BCXMIN -2.05
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#define BCXMAX 2.0 /* x interval for boundary condition */
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#define BCYMIN -1.125
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#define BCYMAX 1.25 /* y interval for boundary condition */
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#define OBSXMIN -2.0
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#define OBSXMAX 2.0 /* x interval for motion of obstacle */
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#define CIRCLE_PATTERN 8 /* pattern of circles, see list in global_ljones.c */
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#define ADD_FIXED_OBSTACLES 0 /* set to 1 do add fixed circular obstacles */
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#define OBSTACLE_PATTERN 3 /* pattern of obstacles, see list in global_ljones.c */
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#define ADD_FIXED_SEGMENTS 0 /* set to 1 to add fixed segments as obstacles */
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#define SEGMENT_PATTERN 12 /* pattern of repelling segments, see list in global_ljones.c */
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#define NOZZLE_SHAPE 1 /* shape of nozzle, see list in global_ljones.c */
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#define NOZZLE_SHAPE_B 2 /* shape of nozzle for second rocket, see list in global_ljones.c */
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#define TWO_TYPES 0 /* set to 1 to have two types of particles */
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#define TPYE_PROPORTION 0.7 /* proportion of particles of first type */
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#define SYMMETRIZE_FORCE 1 /* set to 1 to symmetrize two-particle interaction, only needed if particles are not all the same */
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#define CENTER_PX 0 /* set to 1 to center horizontal momentum */
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#define CENTER_PY 0 /* set to 1 to center vertical momentum */
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#define CENTER_PANGLE 0 /* set to 1 to center angular momentum */
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#define INTERACTION 1 /* particle interaction, see list in global_ljones.c */
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#define INTERACTION_B 1 /* particle interaction for second type of particle, see list in global_ljones.c */
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#define SPIN_INTER_FREQUENCY 5.0 /* angular frequency of spin-spin interaction */
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#define SPIN_INTER_FREQUENCY_B 2.0 /* angular frequency of spin-spin interaction for second particle type */
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#define P_PERCOL 0.25 /* probability of having a circle in C_RAND_PERCOL arrangement */
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#define NPOISSON 100 /* number of points for Poisson C_RAND_POISSON arrangement */
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#define PDISC_DISTANCE 3.0 /* minimal distance in Poisson disc process, controls density of particles */
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#define PDISC_CANDIDATES 100 /* number of candidates in construction of Poisson disc process */
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#define RANDOM_POLY_ANGLE 0 /* set to 1 to randomize angle of polygons */
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#define LAMBDA 0.8 /* parameter controlling the dimensions of domain */
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#define MU 0.009 /* parameter controlling radius of particles */
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#define MU_B 0.018 /* parameter controlling radius of particles of second type */
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#define NPOLY 25 /* number of sides of polygon */
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#define APOLY 0.666666666 /* angle by which to turn polygon, in units of Pi/2 */
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#define MDEPTH 4 /* depth of computation of Menger gasket */
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#define MRATIO 3 /* ratio defining Menger gasket */
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#define MANDELLEVEL 1000 /* iteration level for Mandelbrot set */
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#define MANDELLIMIT 10.0 /* limit value for approximation of Mandelbrot set */
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#define FOCI 1 /* set to 1 to draw focal points of ellipse */
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#define NGRIDX 46 /* number of grid point for grid of disks */
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#define NGRIDY 24 /* number of grid point for grid of disks */
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#define EHRENFEST_RADIUS 0.9 /* radius of container for Ehrenfest urn configuration */
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#define EHRENFEST_WIDTH 0.035 /* width of tube for Ehrenfest urn configuration */
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#define TWO_CIRCLES_RADIUS_RATIO 0.8 /* ratio of radii for S_TWO_CIRCLES_EXT segment configuration */
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#define DAM_WIDTH 0.05 /* width of dam for S_DAM segment configuration */
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#define X_SHOOTER -0.2
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#define Y_SHOOTER -0.6
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#define X_TARGET 0.4
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#define Y_TARGET 0.7 /* shooter and target positions in laser fight */
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/* Parameters for length and speed of simulation */
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#define NSTEPS 3500 /* number of frames of movie */
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#define NVID 60 /* number of iterations between images displayed on screen */
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#define NSEG 250 /* number of segments of boundary */
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#define INITIAL_TIME 20 /* time after which to start saving frames */
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#define OBSTACLE_INITIAL_TIME 10 /* time after which to start moving obstacle */
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#define BOUNDARY_WIDTH 1 /* width of particle boundary */
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#define LINK_WIDTH 2 /* width of links between particles */
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#define CONTAINER_WIDTH 4 /* width of container boundary */
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#define PAUSE 1000 /* number of frames after which to pause */
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#define PSLEEP 1 /* sleep time during pause */
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#define SLEEP1 1 /* initial sleeping time */
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#define SLEEP2 1 /* final sleeping time */
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#define MID_FRAMES 20 /* number of still frames between parts of two-part movie */
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#define END_FRAMES 100 /* number of still frames at end of movie */
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/* Boundary conditions, see list in global_ljones.c */
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#define BOUNDARY_COND 0
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/* Plot type, see list in global_ljones.c */
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#define PLOT 11
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#define PLOT_B 0 /* plot type for second movie */
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#define DRAW_BONDS 1 /* set to 1 to draw bonds between neighbours */
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#define COLOR_BONDS 1 /* set to 1 to color bonds according to length */
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#define FILL_TRIANGLES 1 /* set to 1 to fill triangles between neighbours */
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/* Color schemes */
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#define COLOR_PALETTE 10 /* Color palette, see list in global_ljones.c */
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#define BLACK 1 /* background */
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#define COLOR_SCHEME 3 /* choice of color scheme, see list in global_ljones.c */
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#define SCALE 0 /* set to 1 to adjust color scheme to variance of field */
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#define SLOPE 0.5 /* sensitivity of color on wave amplitude */
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#define ATTENUATION 0.0 /* exponential attenuation coefficient of contrast with time */
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#define COLORHUE 260 /* initial hue of water color for scheme C_LUM */
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#define COLORDRIFT 0.0 /* how much the color hue drifts during the whole simulation */
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#define LUMMEAN 0.5 /* amplitude of luminosity variation for scheme C_LUM */
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#define LUMAMP 0.3 /* amplitude of luminosity variation for scheme C_LUM */
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#define HUEMEAN 220.0 /* mean value of hue for color scheme C_HUE */
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#define HUEAMP -50.0 /* amplitude of variation of hue for color scheme C_HUE */
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/* particle properties */
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#define ENERGY_HUE_MIN 330.0 /* color of original particle */
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#define ENERGY_HUE_MAX 50.0 /* color of saturated particle */
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#define PARTICLE_HUE_MIN 359.0 /* color of original particle */
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#define PARTICLE_HUE_MAX 0.0 /* color of saturated particle */
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#define PARTICLE_EMAX 2.0e2 /* energy of particle with hottest color */
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#define HUE_TYPE0 280.0 /* hue of particles of type 0 */
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#define HUE_TYPE1 70.0 /* hue of particles of type 1 */
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#define HUE_TYPE2 70.0 /* hue of particles of type 2 */
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#define HUE_TYPE3 210.0 /* hue of particles of type 3 */
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#define RANDOM_RADIUS 0 /* set to 1 for random circle radius */
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#define DT_PARTICLE 3.0e-6 /* time step for particle displacement */
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#define KREPEL 12.0 /* constant in repelling force between particles */
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#define EQUILIBRIUM_DIST 4.5 /* Lennard-Jones equilibrium distance */
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#define EQUILIBRIUM_DIST_B 3.5 /* Lennard-Jones equilibrium distance for second type of particle */
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#define REPEL_RADIUS 20.0 /* radius in which repelling force acts (in units of particle radius) */
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#define DAMPING 20.0 /* damping coefficient of particles */
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#define PARTICLE_MASS 1.0 /* mass of particle of radius MU */
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#define PARTICLE_MASS_B 1.0 /* mass of particle of radius MU */
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#define PARTICLE_INERTIA_MOMENT 0.2 /* moment of inertia of particle */
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#define PARTICLE_INERTIA_MOMENT_B 0.02 /* moment of inertia of second type of particle */
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#define V_INITIAL 0.0 /* initial velocity range */
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#define OMEGA_INITIAL 10.0 /* initial angular velocity range */
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#define THERMOSTAT 1 /* set to 1 to switch on thermostat */
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#define VARY_THERMOSTAT 0 /* set to 1 for time-dependent thermostat schedule */
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#define SIGMA 5.0 /* noise intensity in thermostat */
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#define BETA 0.006 /* initial inverse temperature */
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#define MU_XI 0.01 /* friction constant in thermostat */
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#define KSPRING_BOUNDARY 1.0e11 /* confining harmonic potential outside simulation region */
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#define KSPRING_OBSTACLE 1.0e11 /* harmonic potential of obstacles */
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#define NBH_DIST_FACTOR 7.0 /* radius in which to count neighbours */
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#define GRAVITY 1000.0 /* gravity acting on all particles */
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#define INCREASE_GRAVITY 0 /* set to 1 to increase gravity during the simulation */
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#define GRAVITY_SCHEDULE 2 /* type of gravity schedule, see list in global_ljones.c */
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#define GRAVITY_FACTOR 100.0 /* factor by which to increase gravity */
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#define GRAVITY_INITIAL_TIME 200 /* time at start of simulation with constant gravity */
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#define GRAVITY_RESTORE_TIME 700 /* time at end of simulation with gravity restored to initial value */
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#define ROTATION 0 /* set to 1 to include rotation of particles */
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#define COUPLE_ANGLE_TO_THERMOSTAT 0 /* set to 1 to couple angular degrees of freedom to thermostat */
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#define DIMENSION_FACTOR 1.0 /* scaling factor taking into account number of degrees of freedom */
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#define KTORQUE 100.0 /* force constant in angular dynamics */
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#define KTORQUE_B 10.0 /* force constant in angular dynamics */
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#define KTORQUE_DIFF 150.0 /* force constant in angular dynamics for different particles */
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#define DRAW_SPIN 0 /* set to 1 to draw spin vectors of particles */
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#define DRAW_SPIN_B 0 /* set to 1 to draw spin vectors of particles */
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#define DRAW_CROSS 1 /* set to 1 to draw cross on particles of second type */
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#define SPIN_RANGE 7.0 /* range of spin-spin interaction */
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#define SPIN_RANGE_B 5.0 /* range of spin-spin interaction for second type of particle */
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#define QUADRUPOLE_RATIO 0.6 /* anisotropy in quadrupole potential */
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#define INCREASE_BETA 0 /* set to 1 to increase BETA during simulation */
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#define BETA_FACTOR 0.01 /* factor by which to change BETA during simulation */
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#define N_TOSCILLATIONS 1.5 /* number of temperature oscillations in BETA schedule */
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#define NO_OSCILLATION 1 /* set to 1 to have exponential BETA change only */
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#define MIDDLE_CONSTANT_PHASE 370 /* final phase in which temperature is constant */
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#define FINAL_DECREASE_PHASE 350 /* final phase in which temperature decreases */
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#define FINAL_CONSTANT_PHASE 1180 /* final phase in which temperature is constant */
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#define DECREASE_CONTAINER_SIZE 0 /* set to 1 to decrease size of container */
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#define SYMMETRIC_DECREASE 0 /* set tp 1 to decrease container symmetrically */
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#define COMPRESSION_RATIO 0.3 /* final size of container */
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#define RESTORE_CONTAINER_SIZE 1 /* set to 1 to restore container to initial size at end of simulation */
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#define RESTORE_TIME 700 /* time before end of sim at which to restore size */
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#define MOVE_OBSTACLE 0 /* set to 1 to have a moving obstacle */
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#define CENTER_VIEW_ON_OBSTACLE 0 /* set to 1 to center display on moving obstacle */
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#define RESAMPLE_Y 0 /* set to 1 to resample y coordinate of moved particles (for shock waves) */
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#define NTRIALS 2000 /* number of trials when resampling */
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#define OBSTACLE_RADIUS 0.12 /* radius of obstacle for circle boundary conditions */
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#define FUNNEL_WIDTH 0.25 /* funnel width for funnel boundary conditions */
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#define OBSTACLE_XMIN 0.0 /* initial position of obstacle */
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#define OBSTACLE_XMAX 3.0 /* final position of obstacle */
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#define RECORD_PRESSURES 0 /* set to 1 to record pressures on obstacle */
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#define N_PRESSURES 100 /* number of intervals to record pressure */
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#define N_P_AVERAGE 100 /* size of pressure averaging window */
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#define N_T_AVERAGE 50 /* size of temperature averaging window */
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#define MAX_PRESSURE 3.0e10 /* pressure shown in "hottest" color */
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#define PARTIAL_THERMO_COUPLING 1 /* set to 1 to couple only particles to the right of obstacle to thermostat */
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#define PARTIAL_THERMO_REGION 2 /* region for partial thermostat coupling (see list in global_ljones.c) */
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#define PARTIAL_THERMO_SHIFT 0.2 /* distance from obstacle at the right of which particles are coupled to thermostat */
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#define PARTIAL_THERMO_WIDTH 0.5 /* vertical size of partial thermostat coupling */
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#define PARTIAL_THERMO_HEIGHT 0.2 /* vertical size of partial thermostat coupling */
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#define INCREASE_KREPEL 0 /* set to 1 to increase KREPEL during simulation */
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#define KREPEL_FACTOR 1000.0 /* factor by which to change KREPEL during simulation */
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#define PART_AT_BOTTOM 0 /* set to 1 to include "seed" particles at bottom */
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#define MASS_PART_BOTTOM 10000.0 /* mass of particles at bottom */
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#define NPART_BOTTOM 100 /* number of particles at the bottom */
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#define ADD_PARTICLES 0 /* set to 1 to add particles */
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#define ADD_TIME 0 /* time at which to add first particle */
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#define ADD_PERIOD 10000 /* time interval between adding further particles */
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#define FINAL_NOADD_PERIOD 200 /* final period where no particles are added */
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#define SAFETY_FACTOR 2.0 /* no particles are added at distance less than MU*SAFETY_FACTOR of other particles */
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#define TRACER_PARTICLE 0 /* set to 1 to have a tracer particle */
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#define N_TRACER_PARTICLES 3 /* number of tracer particles */
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#define TRAJECTORY_LENGTH 8000 /* length of recorded trajectory */
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#define TRACER_PARTICLE_MASS 4.0 /* relative mass of tracer particle */
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#define TRAJECTORY_WIDTH 3 /* width of tracer particle trajectory */
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#define ROTATE_BOUNDARY 0 /* set to 1 to rotate the repelling segments */
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#define SMOOTH_ROTATION 1 /* set to 1 to update segments at each time step (rather than at each movie frame) */
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#define PERIOD_ROTATE_BOUNDARY 1000 /* period of rotating boundary */
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#define ROTATE_INITIAL_TIME 0 /* initial time without rotation */
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#define ROTATE_FINAL_TIME 100 /* final time without rotation */
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#define ROTATE_CHANGE_TIME 0.33 /* relative duration of acceleration/deceleration phases */
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#define OMEGAMAX 100.0 /* maximal rotation speed */
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#define PRINT_OMEGA 0 /* set to 1 to print angular speed */
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#define PRINT_PARTICLE_SPEEDS 0 /* set to 1 to print average speeds/momenta of particles */
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#define PRINT_SEGMENTS_SPEEDS 0 /* set to 1 to print velocity of moving segments */
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#define MOVE_BOUNDARY 0 /* set to 1 to move repelling segments, due to force from particles */
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#define SEGMENTS_MASS 40.0 /* mass of collection of segments */
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#define DEACTIVATE_SEGMENT 1 /* set to 1 to deactivate last segment after a certain time */
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#define SEGMENT_DEACTIVATION_TIME 1000 /* time at which to deactivate last segment */
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#define RELEASE_ROCKET_AT_DEACTIVATION 0 /* set to 1 to limit segments velocity before segment release */
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#define SEGMENTS_X0 0.0 /* initial position of segments */
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#define SEGMENTS_Y0 1.5 /* initial position of segments */
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#define SEGMENTS_VX0 0.0 /* initial velocity of segments */
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#define SEGMENTS_VY0 -4.0 /* initial velocity of segments */
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#define DAMP_SEGS_AT_NEGATIVE_Y 0 /* set to 1 to dampen segments when y coordinate is negative */
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#define POSITION_DEPENDENT_TYPE 0 /* set to 1 to make particle type depend on initial position */
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#define POSITION_Y_DEPENDENCE 0 /* set to 1 for the separation between particles to be vertical */
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#define PRINT_ENTROPY 0 /* set to 1 to compute entropy */
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#define REACTION_DIFFUSION 0 /* set to 1 to simulate a chemical reaction (particles may change type) */
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#define RD_TYPES 3 /* number of types in reaction-diffusion equation */
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#define REACTION_PROB 0.0045 /* probability controlling reaction term */
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#define PRINT_PARTICLE_NUMBER 0 /* set to 1 to print total number of particles */
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#define PRINT_LEFT 1 /* set to 1 to print certain parameters at the top left instead of right */
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#define EHRENFEST_COPY 0 /* set to 1 to add equal number of larger particles (for Ehrenfest model) */
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#define LID_MASS 1000.0 /* mass of lid for BC_RECTANGLE_LID b.c. */
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#define LID_WIDTH 0.1 /* width of lid for BC_RECTANGLE_LID b.c. */
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#define WALL_MASS 2000.0 /* mass of wall for BC_RECTANGLE_WALL b.c. */
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#define WALL_FRICTION 0.0 /* friction on wall for BC_RECTANGLE_WALL b.c. */
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#define WALL_WIDTH 0.1 /* width of wall for BC_RECTANGLE_WALL b.c. */
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#define WALL_VMAX 100.0 /* max speed of wall */
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#define WALL_TIME 500 /* time during which to keep wall */
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#define FLOOR_FORCE 1 /* set to 1 to limit force on particle to FMAX */
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#define FMAX 1.0e12 /* maximal force */
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#define FLOOR_OMEGA 0 /* set to 1 to limit particle momentum to PMAX */
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#define PMAX 1000.0 /* maximal force */
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#define HASHX 120 /* size of hashgrid in x direction */
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#define HASHY 60 /* size of hashgrid in y direction */
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#define HASHMAX 100 /* maximal number of particles per hashgrid cell */
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#define HASHGRID_PADDING 0.1 /* padding of hashgrid outside simulation window */
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#define DRAW_COLOR_SCHEME 0 /* set to 1 to plot the color scheme */
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#define COLORBAR_RANGE 8.0 /* scale of color scheme bar */
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#define COLORBAR_RANGE_B 12.0 /* scale of color scheme bar for 2nd part */
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#define ROTATE_COLOR_SCHEME 0 /* set to 1 to draw color scheme horizontally */
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```
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