cfg = dict(
    dtype="float32",
    dt=1 / 9600,
    frame_dt=1 / 24,
    particle_chunk_size=2**10,
    write_out=True,
    dx=0.02,
    lower_bound_pos=[-0.8, -0.1, -0.8],
    upper_bound_pos=[0.7, 1.0, 0.7],
    gravity=[0, -9.8, 0],
    base_dir=None,
    taichi_cuda_memory=4.0,
    BC={"ground": [[0, 0, 0], [0, 1, 0]]},
    rho=1000,
    n_frames=16,
)