SPHSolver#

SPHSolver 实现了 Smoothed Particle Hydrodynamics (SPH，光滑粒子流体动力学)，用于流体仿真。

概述#

SPH 使用粒子来近似流体动力学：

Pressure forces from density (来自密度的压力)
Viscosity forces from velocity differences (来自速度差的粘性力)
Surface tension (optional) (表面张力，可选)
Free surface handling (自由表面处理)

支持的材料#

Material	Description
`SPH.Liquid`	General liquid simulation (通用液体仿真)

使用方法#

import genesis as gs

gs.init()
scene = gs.Scene(
    sph_options=gs.options.SPHOptions(
        lower_bound=(-1, -1, 0),
        upper_bound=(1, 1, 2),
        particle_size=0.02,
    ),
)

# Add fluid
fluid = scene.add_entity(
    gs.morphs.Box(pos=(0, 0, 0.5), size=(0.4, 0.4, 0.4)),
    material=gs.materials.SPH.Liquid(
        rho=1000,     # Density (密度)
        viscosity=0.01,
    ),
)

# Add rigid container
container = scene.add_entity(gs.morphs.Box(
    pos=(0, 0, 0.5),
    size=(0.5, 0.5, 0.5),
    is_rigid=True,
    vis_mode="collision",
))

scene.build()

for i in range(1000):
    scene.step()

配置#

SPHOptions 中的关键选项：

Option	Type	Description
`lower_bound`	tuple	Domain lower corner (域下角)
`upper_bound`	tuple	Domain upper corner (域上角)
`particle_size`	float	Particle spacing (粒子间距)
`dt`	float	Internal timestep (内部时间步长)

参数#

Parameter	Description	Typical Range
`rho`	Rest density (静止密度)	1000 kg/m^3 (water)
`viscosity`	Dynamic viscosity (动力粘度)	0.001-0.1
`stiffness`	Pressure stiffness (压力刚度)	1000-10000

另请参阅#