Fluid model
VariationalPressurelessFluid
Pressure-less fluid equations discretized with a variational method.
Overview
This is the pressureless limit of the variational fluid hierarchy. It
is intended as a reduced benchmark and as a simple transport model with conservative density and momentum updates.
Use cases
This model is appropriate for:
- pressureless compressible benchmarks
- testing the minimal variational fluid update chain
- reduced transport problems without thermodynamics
Governing equations
PDEs solved by model:
Continuity:
Momentum:
Normalization
The flow speed is normalized with the Alfvén speed:
Discretization
Time integration is performed by the following propagators (in sequence):
struphy.propagators.variational_density_evolve.VariationalDensityEvolvestruphy.propagators.variational_momentum_advection.VariationalMomentumAdvection
Diagnostics
The following scalars are tracked during simulation:
- Kinetic energy:
kinetic_energy
Example
Create and initialize a pressureless variational-fluid model:
from struphy.models import VariationalPressurelessFluid
model = VariationalPressurelessFluid()
model.fluid.density