Acoustic1st

class Acoustic1st(
    spatial_order=4,
    device="cpu",
    backend="jax",
)

Implementation:

• src/sweep/equations/acoustic1st.py

First-order acoustic equation in pressure-velocity form.

Parameters

• spatial_order (int, optional): Finite-difference order. It should be an even number.
• device (device or str, optional): Target device used to place operator kernels and backend-specific tensors.
• backend (str, optional): Numerical backend. The default in this class is "jax". If you plan to run with a torch-based propagator, the equation side should still use "torch" rather than "cuda".

Models

• models (list[str]): ["vp", "rho"]

Required models:

• vp: P-wave velocity model
• rho: density model

Wavefields

The actual wavefields depend on the selected PML type.

• cpmls mode: ["p", "vx", "vz", "phix", "phiz", "psix", "psiz"]
• spml mode: ["px", "pz", "vx", "vz"]

Backend Behavior

• equation behavior changes through setup_pml(pml_type)
• supports cpmls and spml
• does not expose a compiled torch binding hook

Torch Binding

• supports_torch_binding() : False