2D multiphase SPH/SDPD code (authors: Xiangyu Hu, Sergey Litvinov, Oliver Oberinger, Martin Bernreuther, Andreas Mattes).
$ (cd src && make) $ (cd example && make)
make test
runs tests (requres atest).
Run fluctuating liquid, Couette flow, and elliptic drop: cases/thermal.cfg, cases/couette.cfg, cases/ellipse.cfg.
To use the initial condition file
INITIAL_CONDITION <1/0>
The level of statistics output
DIAGNOSE 2
number of cells in x and y direction
CELLS <nx> <ny>
size of one cell
CELL_SIZE 5.0e-3
support length
SMOOTHING_LENGTH 5.0e-3
the number of particle in one direction in a cell
CELL_RATIO 3
the basic of units (used for dimensionless calculations)
DIMENSION <length> <velcoity> <density> <temperature>
simulation time
TIMING <inital time> <the last time> <output time interval>
gravity force vector
GRAVITY <gx> <gy>
Boundary conditions (order is as follow X0, X1, Y0, Y1) type code 1: periodic 0: wall
BOUNDARY
<type codes of boundary <velocity of the wall>
...
NUMBER_OF_MATERIALS <numb_mat>
MATERIALS
<material_name> <material_type> <eta> <zeta> <gamma> <rho0> <a0>
(numb_mat lines)
FORCES
<mat#k> <mat#m> <sigma> <shear_slip> <bulk_slip>
(numb_mat*numb_mat lines, one for each material pair)
sigma
is a surface tension coefficient
<start time> <number of particles> ... <material name> <X> <Y> <Vx> <Vy> <density> <pressure> <temperature> ...
Couette flow simulation
$ example/sdpd cases/couette $ example/sdpd cases/couette The left, right, lower and upper boundary 1 1 0 0 0: wall boundary condition 1: perodic boundary condition 2: free slip wall boundary condition 3: symmetry boundary condition read the propeties of materials and forces N=10 Time: 0.00868056 dt: 0.000868056 ...
Water drop in air starting from an initial condition file
$ example/sdpd cases/ellipse The left, right, lower and upper boundary 1 1 0 0 0: wall boundary condition 1: perodic boundary condition 2: free slip wall boundary condition 3: symmetry boundary condition read the propeties of materials and forces ini.c:787: Read real particles from 'cases/ellipse.txt' ini.c:798: N = 576 N=10 Time: 0.778993 dt: 0.000868056 ...
Output is in ASCII tecplot files, to convert to punto format run
$ scripts/2punto outdata > punto.dat
$ punto -D 2 -V -s 50 punto.dat $ punto -D 2 -c 4 -B 0:0:0.04:0.04 -G -0.2:0.2 punto.dat
in gnuplot shell
$ plot n=1, 'punto.dat' u 2:3 every :::n::n $ plot n=10, A=250.0, 'punto.dat' u 2:3 every :::n::n+5, A*x*(L-x)
Poiseuille flow
Ellipsoid water drop in air
Fluctuating liquid
-
Hu, Xianguy, and Nikolaus A. Adams. "A multi-phase SPH method for macroscopic and mesoscopic flows." Journal of Computational Physics 213.2 (2006): 844-861. https://doi.org/10.1016/j.jcp.2005.09.001
-
Litvinov, S., Ellero, M., Hu, X., & Adams, N. A. (2008). Smoothed dissipative particle dynamics model for polymer molecules in suspension. Physical Review E—Statistical, Nonlinear, and Soft Matter Physics, 77(6), 066703.
-
Litvinov, S., Ellero, M., Hu, X., & Adams, N. A. (2008). Smoothed dissipative particle dynamics model for polymer molecules in suspension. Physical Review E—Statistical, Nonlinear, and Soft Matter Physics, 77(6), 066703.
-
gnuplot http://www.gnuplot.info
-
SPH (smoothed-particle hydrodynamics), SDPD (smoothed dissipative particle dynamics)