# -*- encoding=utf-8 -*-

# This script demonstrates SPH-engine in Yade
# !!! Very experimental at the moment!!!

from __future__ import print_function
from yade import utils, plot, qt
o = Omega()

# Physical parameters
fr = 0.5
rho = 1000.0

k = 1.0
tc = 0.0001
en = 0.7
et = 0.7
Rad = 10.0e-3
h = 2 * Rad
o.dt = 0.00001

# Add material
mat1 = O.materials.append(ViscElMat(frictionAngle=fr, density=rho, SPHmode=True, h=h, tc=tc, en=en, et=et, KernFunctionPressure=1, KernFunctionVisco=1))

# Add spheres
d = 0.8
idSpheres = O.bodies.append(pack.regularHexa(pack.inSphere((0, 0, 0), d), radius=Rad, gap=10.5 * Rad, material=mat1, mask=1, color=(0, 1, 1)))

idCentralBody = O.bodies.append(sphere(center=[0, 0, 0], radius=0.1 * Rad, mask=2, color=[1, 0, 0], fixed=True))

# Add engines
o.engines = [
        ForceResetter(),
        InsertionSortCollider([Bo1_Sphere_Aabb(label='is2aabb'), Bo1_Facet_Aabb(label='is3aabb')]),
        InteractionLoop(
                [Ig2_Sphere_Sphere_ScGeom(label='ss2sc'), Ig2_Facet_Sphere_ScGeom()],
                [Ip2_ViscElMat_ViscElMat_ViscElPhys()],
                [Law2_ScGeom_ViscElPhys_Basic()],
        ),
        CentralConstantAccelerationEngine(accel=50.0, label='gr', centralBody=idCentralBody),
        NewtonIntegrator(damping=0.1),
        SPHEngine(mask=1, k=k, rho0=rho, h=h, KernFunctionDensity=1),
        VTKRecorder(
                iterPeriod=1000, mask=1, fileName='./cpt/spheres-', recorders=['spheres', 'velocity', 'colors', 'intr', 'ids', 'mask', 'materialId', 'stress']
        ),
]

enlargeF = h / Rad * 1.1
print("enlargeF = %g" % enlargeF)
is2aabb.aabbEnlargeFactor = enlargeF
ss2sc.interactionDetectionFactor = enlargeF

O.step()
qt.View()
